A

Abbas, F; Allan, D W*; Ashby, N*; Hodge, C; Holland, J*; Jedamzik, D*; Langham, C D; Maleki, L*; Trowles, T* (1997) A novel concept for the direct intercomparison of the Allan Variance of frequency standards at the 10-18 level with application to metrology, global communication and navigation. In: Proc. 11th European Frequency and Time forum, 1997, Neuchatel, Switzerland.

Alexander, M J (1996) Experience of correlating measurements in the frequency range 30MHz to 1GHz. IEE Colloq. Dig., 1996/0. 7/1-6.

Amelino-Camelia, G*; Aplin, K*; Arndt, M*; Barrow, J D*; Bingham, R J*; Borde, C*; Bouyer, P*; Caldwell, M*; Cruise, A M*; Damour, T*; D'Arrigo, P*; Dittus, H*; Ertmer, W*; Foulon, B*; Gill, P; Hammond, G D*; Hough, J*; Jentsch, C*; Johann, U*; Jetzer, P*; Klein, H A; Lambrecht, A*; Lamine, B*; Lammerzahl, C*; Lockerbie, N*; Loeffler, F*; Mendonca, J T*; Mester, J*; Ni, W T*; Pegrum, C*; Peters, A*; Rasel, E*; Reynaud, S*; Shaul, D*; Sumner, T J*; Theil, S*; Torrie, C*; Touboul, P*; Trenkel, C*; Vitale, S*; Vodel, W*; Wang, C*; Ward, H*; Woodgate, A* (2009) GAUGE: the GrAnd Unification and Gravity Explorer. Exp. Astron., 23 (2). pp. 549-572.

Amos, B*; Gill, P (1995) Optical tweezers. Meas. Sci. Technol., 6. p. 248.

Appourchaux, T*; Burston, R*; Chen, Y B*; Cruise, M*; Dittus, H*; Foulon, B*; Gill, P; Gizon, L*; Klein, H A; Klioner, S*; Kopeikin, S*; Kruger, H*; Lammerzahl, C*; Lobo, A*; Luo, X L*; Margolis, H S; Ni, W T*; Paton, A P*; Peng, Q H*; Peters, A*; Rasel, E*; Rudiger, A*; Samain, E*; Selig, H*; Shaul, D*; Sumner, T*; Theil, S*; Touboul, P*; Turyshev, S*; Wang, H T*; Wang, L*; Wen, L Q*; Wicht, A*; Wu, J*; Zhang, X M*; Zhao, C* (2009) Astrodynamical Space Test of Relativity Using Optical Devices I (ASTROD I)-A class-M fundamental physics mission proposal for Cosmic Vision 2015-2025. Exp. Astron., 23 (2). pp. 491-527.

Awan, S A; Kibble, B P; Robinson, I A; Giblin, S P (2000) A new four terminal-pair bridge for impedance measurements at frequencies up to 1 MHz. In: Conference on Precision Electromagnetic Measurements (CPEM) 2000, 14-19 May 2000, Sydney, Australia.

B

Barwood, G P; Edwards, C S; Gill, P; Huang, G; Klein, H A; Rowley, W R C (1995) Precision interferometric frequency measurement of the 674nm 2S1/2 - 2D5/2 transition in a single cold Sr+ ion. IEEE Trans. Instrum. Meas., 44 (2). pp. 117-119.

Barwood, G P; Edwards, C S; Gill, P; Klein, H A; Rowley, W R C (1993) Development of diode and fibre laser sources for a Sr+ trapped ion optical frequency standard. Proc. SPIE - Int. Soc. Opt. Eng., 1837. pp. 271-7.

Barwood, G P; Edwards, C S; Gill, P; Klein, H A; Rowley, W R C (1994) Laser cooling and probing of a trapped strontium ion using all-solid-state lasers. AIP Conf. Proc., 290. pp. 35-37.

Barwood, G P; Edwards, C S; Gill, P; Klein, H A; Rowley, W R C (1993) Observation of the 5s2S1/2-4d2D5/2 transition in a single laser-cooled trapped Sr+ ion using an all-solid-state system of lasers. Opt. Lett., 18 (9). pp. 732-734.

Barwood, G P; Gao, K; Gill, P; Huang, G; Klein, H A (2001) Development of an ultra-narrow diode laser for interrogating the 674 nm 2S1/2 - 2D5/2 'clock' transition in Sr+. Proc. SPIE - Int. Soc. Opt. Eng., 4269. pp. 134-142.

Barwood, G P; Gao, K; Gill, P; Huang, G; Klein, H A (2000) Development of optical frequency standards based upon the 2S1/2 - 2D5/2 transition in 88Sr+. In: Conference on Precision Electromagnetic Measurements (CPEM) 2000, 14-19 May 2000, Sydney, Australia.

Barwood, G P; Gao, K*; Gill, P; Huang, G; Klein, H A (2001) Development of optical frequency standards based upon the 2S1/2-2D5/2 transition in 88Sr+ and 87Sr+. IEEE Trans. Instrum. Meas., 50 (2). pp. 543-547.

Barwood, G P; Gao, K*; Gill, P; Huang, G; Klein, H A (2003) Observation of the hyperfine structure of the 2S1/2 - 2D5/2 674 nm optical clock transition in 87Sr+. Phys. Rev. A, At. Mol. Opt. Phys., 67. 013402

Barwood, G P; Gill, P (2003) Laser stabilisation for precision measurements. In: Handbook of Laser Technology and Applications. IOP, Bristol, UK, pp. 1393-1414.

Barwood, G P; Gill, P; Huang, G; Klein, H A (2012) Automatic laser control for a 88Sr+ optical frequency standard. Meas. Sci. Technol., 23 (5). 055201

Barwood, G P; Gill, P; Huang, G; Klein, H A (2012) Characterization of a 88Sr+ optical frequency standard at 445 THz by two-trap comparison. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Barwood, G P; Gill, P; Huang, G; Klein, H A (1999) Development of an optical frequency standard based upon the 2S1/2-2D5/2 transition in Sr+. In: 13th EFTF/ 1999 IEEE FCS Conference Proceedings, 1999.

Barwood, G P; Gill, P; Huang, G; Klein, H A (2007) Observation of a sub-10-Hz linewidth 88Sr+ 2S1/2-2D5/2 clock transition at 674 nm. IEEE Trans. Instrum. Meas., 56 (2). pp. 226-229.

Barwood, G P; Gill, P; Huang, G; Klein, H A (2002) Stability and reproducibility of an optical frequency standard based upon the 2S1/2 - 2D5/2 transition in 88Sr+. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

Barwood, G P; Gill, P; Huang, G; Klein, H A (1995) Studies of trapped strontium ions in low magnetic fields. Appl. Phys. B, Laser Opt., 61 (4). p. 385.

Barwood, G P; Gill, P; Huang, G; Klein, H A; Rowley, W R C (1997) Single Sr+ Ion spectroscopy with a sub-kHz linewidth diode probe laser. In: 13th International Conference on Laser Spectroscopy, June 1997, Hangzhou, China.

Barwood, G P; Gill, P; Klein, H A; Huang, G; Walton, B R (2006) An optical frequency standard based on a transition in a single trapped strontium ion. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Barwood, G P; Gill, P; Klein, H A; Huang, G; Walton, B R (2006) An optical frequency standard based on a transition in a single trapped strontium ion. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Barwood, G P; Gill, P; Klein, H A; Rowley, W R C (1997) Clearly resolved secular sidebands on the 2S1/2-2D5/2 674nm clock transition in a single trapped Sr+ ion and prospects for trapped ion frequency standards. IEEE Trans. Instrum. Meas., 46 (2). pp. 133-136.

Barwood, G P; Gill, P; Klein, H A; Rowley, W R C (1996) Observation of fluorescence from cold trapped Sr ions in a near-zero magnetic field and 674nm probe laser development. In: Proc. Fifth symposium of Frequency Standards and Metrology, 1996, Singapore.

Barwood, G P; Gill, P; Klein, H A; Rowley, W R C (1998) Sub-kHz "clock" transition linewidths in a cold trapped 88Sr+ ion in low magnetic fields using 1092-nm polarisation switching. Opt. Commun., 151 (1-3). pp. 50-5.

Barwood, G P; Gill, P; Rowley, W R C (1998) High accuracy length metrology using multiple-stage swept-frequency interferometry with laser diodes. Meas. Sci. Technol., 9 (7). pp. 1036-41.

Barwood, G P; Huang, G; King, S A; Klein, H A; Gill, P (2015) Frequency noise processes in a strontium ion optical clock. J. Phys. B, At. Mol. Opt. Phys., 48 (3). 035401

Barwood, G P; Huang, G; King, S A; Klein, H A; Gill, P (2016) Trapped-ion 88Sr+ optical clock systematic uncertainties - AC Stark shift determination. J. Phys.: Conf. Ser., 723. 012024

Barwood, G P; Huang, G; Klein, H A; Gill, P (2015) Automatic minimisation of micromotion in a 88Sr+ optical clock. Meas. Sci. Technol., 26 (7). 075203

Barwood, G P; Huang, G; Klein, H A; Gill, P; Clarke, R B M* (1999) Sub-kHz comparison of the single-ion optical-clock 2S1/2 - 2D5/2 transition in two 88Sr+ traps. Phys. Rev. A, At. Mol. Opt. Phys., 59. R3178-81

Barwood, G P; Huang, G; Klein, H A; Johnson, L A M; King, S A; Margolis, H S; Szymaniec, K; Gill, P (2014) Agreement between two 88Sr+ optical clocks to 4 parts in 10^17. Phys. Rev. A, 89 (5). 050501

Barwood, G P; Huang, G; Klein, H A; Margolis, H S; Lea, S N; Szymaniec, K; Chalupczak, W; Gill, P (2006) An optical frequency standard based on a transition in a single trapped strontium ion. In: Optical Frequency Combs for Space International Workshop, 2-3 October 2006, NPL, UK.

Bauch, A*; Achkar, J*; Bize, S*; Calonico, D*; Dach, R*; Hlavac, R*; Lorini, L*; Parker, T*; Petit, G*; Piester, D; Szymaniec, K; Uhrich, P* (2006) Comparison between frequency standards in Europe and the USA at the 10-15 uncertainty level. Metrologia, 43 (1). pp. 109-120.

Bevington, P.; Gartman, R.; Chalupczak, W.; Deans, C.; Marmugi, L.; Renzoni, F. (2018) Non-destructive structural imaging of steelwork with atomic magnetometers. Applied Physics Letters, 113 (6). 063503 ISSN 0003-6951

Blythe, P J; Webster, S A; Hosaka, K; Gill, P (2003) Systematic frequency shifts of the 467 nm electric octupole transition in 171Yb+. J. Phys. B, At. Mol. Phys., 36 (5). pp. 981-989.

Blythe, P J; Webster, S A; Margolis, H S; Lea, S N; Huang, G; Choi, S-K; Rowley, W R C; Gill, P; Windeler, R S* (2003) Sub-kilohertz absolute frequency measurement of the 467 nm electric octupole transition in 171Yb+. Phys. Rev. A, At. Mol. Opt. Phys., 67 (2). 020501

Blythe, P J; Webster, S A; Margolis, H S; Lea, S N; Huang, G; Choi, S-K*; Rowley, W R C; Gill, P; Windeler, R S* (2003) Sub-kilohertz absolute frequency measurements of the 467 nm electric octuple transition in 171Yb+. Phys. Rev. A, At. Mol. Opt. Phys., 67. 020501

Bongs, K*; Boyer, V*; Cruise, M A*; Freise, A*; Holynski, M*; Hughes, J*; Kaushik, A*; Lien, Y H*; Niggebaum, A*; Perea-Ortiz, M*; Petroz, P*; Plant, S*; Singh, Y*; Stabrawa, A*; Paul, D J*; Sorel, M*; Cumming, D R S*; Marsh, J H*; Bowtell, R W*; Bason, M G*; Beardsley, R P*; Campion, R P*; Brookes, M J*; Fernholz, T*; Fromhold, T M*; Hackermuller, L*; Kruger, P*; Li, X*; Maclean, J O*; Mellor, C J*; Novikov, S V*; Orucevic, F*; Rushforth, A W*; Welch, N*; Benson, T M*; Wildman, R D*; Greegarde, T*; Himsworth, M*; Ruostekoski, J*; Smith, P*; Tropper, A*; Griffin, P F*; Arnold, A S*; Riis, E*; Hastie, J E*; Paboeuf, D*; Parrotta, D C*; Garraway, B M*; Pasquazi, A*; Peccianti, M*; Hensinger, W*; Potter, E*; Nizamani, A H*; Bostock, H*; Blanco, A R*; Sinuco-Leon, G*; Hill, I R; Williams, R A; Gill, P; Hempler, N*; Malcolm, G P A*; Cross, T*; Kock, B O*; Maddox, S*; John, P* (2016) The UK national quantum technology hub in sensors and metrology. Proc. SPIE - Int. Soc. Opt. Eng., 9900. 990009

Bongs, K*; Singh, Y*; Smith, L*; He, W*; Kock, O*; Swierad, D*; Hughes, J*; Schiller, S*; Alighanbari, S*; Origlia, S*; Vogt, S*; Sterr, O*; Lisdat, C*; Le Targat, R*; Lodewyck, J*; Holleville, D*; Venon, B*; Bize, S*; Barwood, G P; Gill, P; Hill, I R*; Ovchinnikov, Y B; Poli, N*; Tino, G M*; Stuhler, J*; Kaenders, W* (2015) Development of a strontium optical lattice clock for the SOC mission on the ISS. Comptes Rendus Physique, 16 (5). pp. 553-564.

Bowden, W; Hill, I R; Baird, P E G*; Gill, P (2017) Note: a high-performance, low-cost laser shutter using a piezoelectric cantilever actuator. Rev. Sci. Instrum., 88 (1). 016102

Burroughs Jr, C J*; Benz, S P*; Dresselhaus, P D*; Waltrip, B C*; Nelson, T L*; Yonuk Chong*,, ; Williams, J M; Henderson, D; Patel, P; Palafox, L*; Beht, R* (2007) Development of a 60 Hz power standard using SNS programmable Josephson voltage standards. IEEE Trans. Instrum. Meas., 56 (2). pp. 289-294.

Burt, E*; Gill, P (2012) Introduction to the special issue on the 2011 joint IEEE International Frequency Control Symposium and European Frequency and Time Forum. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 59 (3). pp. 332-333.

C

Chalupczak, W; Godun, R M (2011) Near-resonance spin noise spectroscopy. Phys. Rev. A, 83 (3). 032512

Chalupczak, W; Godun, R M; Anielski, P*; Wojciechowski, A*; Pustelny, S* (2012) Enhancement of optically pumped spin orientation via spin exchange collisions at low vapour density. Phys. Rev. A, 85 (4). 043402

Chalupczak, W; Josephs-Franks, P W (2015) Alkali-metal spin maser. Phys. Rev. Lett., 115 (3). 033004

Chalupczak, W; Josephs-Franks, P W; Patton, B*; Pustelny, S* (2014) Spin-exchange narrowing of the atomic ground-state resonances. Phys. Rev. A, 90 (4). 042509

Chalupczak, W; Wojciechowski, A*; Pustelny, S*; Gawlik, W* (2010) Competition between the tensor light shift and nonlinear Zeeman effect. Phys. Rev. A, 82 (2). 023417

Chambers, J P (1995) Improved techniques for monitoring the phase of 1.F. standard- frequency transmissions. In: BEMC 95 7th British Electromagnetic Measurements Conference Digest, 6 - 9 November 1995, Malvern.

Christodoulia, N; Lea, S N; Marra, G; Margolis, H S; Gill, P; Leburn, C G*; Fusari, F*; Brown, C T A* (2007) Mode-locked lasers for remote intercomparison of frequency standards over optical fibre networks. In: OFMC 2007, 15-17 October 2007, NPL, UK.

Clarke, J D; Davis, J A; Laverty, J R (1999) The BIPM/IGS pilot project: a model for high accuracy time dissemination in the future. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, November 1999, Brighton, UK.

Clarke, J D; Davis, J A; Lowe, A J (1999) Characterisation of NPL's geodetic GPS time transfer receivers. In: Proc. 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium, 13-16 April 1999, Besancon, France.

Clarke, R B W*; Riis, E*; Barwood, G P; Gill, P; Huang, G; Klein, H A (1998) A sideband-injection locked extended cavity diode laser for interrogating cold trapped strontium ions. Opt. Commun., 158 (1-6). pp. 36-40.

Collett, M A; Matthews, C E; Esward, T J; Whibberley, P B (2010) Measurement and simulation of clock errors from resource-constrained embedded systems. Meas. Sci. Technol., 21 (7). 075203

Cornish, S L*; Lui, Yi-Wei*; Lane, I C*; Baird, P E G*; Barwood, G P; Taylor, P; Rowley, W R C (2000) Interferometric measurements of 127I2 reference frequencies for 1S-2S spectroscopy in muonium, hydrogen and deuterium. J. Opt. Soc. Am. B, 17 (1). pp. 6-10.

Curtis, E A; Barwood, G P; Huang, G; Edwards, C S; Gieseking, B; Brewer, P J (2017) Ultra-high-finesse NICE-OHMS spectroscopy at 1532 nm for calibrated online ammonia detection. J. Opt. Soc. Am. B, 34 (5). pp. 950-958.

D

Davis, J A (1996) Delay stability measurements made within a two-way time transfer system using satellite ranging from several locations. In: 10th European Frequency and Time Forum, 5 - 7 March 1996, Brighton, UK.

Davis, J A; Bhattarai, S*; Ziebart, M* (2013) Development of a Kalman filter based GPS satellite clock time-offset prediction algorithm. In: 2012 European Frequency and Time Forum (EFTF 2012), 23-27 April 2012, Gothenburg, Sweden.

Davis, J A; Clarke, J D (2001) Time and frequency transfer using GPS common-view. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Davis, J A; Furlong, J M (1997) Report on the study to determine the suitability of GPS disciplined oscillators as time and frequency standards traceable to the UK national time scale UTC (NPL). NPL Report. CTM 1

Davis, J A; Furlong, J M (1997) A study examining the possibility of obtaining traceability to UK National Standards of Time and Frequency using GPS disciplined oscillators. In: Proc. 29th Annual Precise Time and Time Interval Systems and Applications meeting, December 1997, Long Beach, California, USA.

Davis, J A; Furlong, J M; Clarke, J D (1998) The performance characteristics of a two-way time transfer earth station incorporating a new satre modem. In: Proceedings of the 12th European Frequency and Time Forum (EFTF), March 1998, Warsaw.

Davis, J A; Greenhall, C A*; Stacey, P W (2005) A Kalman filter clock algorithm for use in the presence of flicker frequency modulation noise. Metrologia, 42 (1-2). pp. 1-10.

Davis, J A; Lewandowski, W*; De Young, J A*; Kirchner, D*; Hetzel, P*; Parker, A; Klepczynski, W*; de Jong, G*; Söring, A*; Baumont, F*; Bartle, K A; Ressler, H*; Robnik, R*; Veenstra, L* (1996) Comparison of two-way satellite time and frequency transfer and GPS common-view time transfer during the intelsat field trial. In: 10th European Frequency and Time Forum, 5-7 March 1996, Brighton, UK.

Davis, J A; Pearce, P R (1993) Characterisation of the signal delays in a ground station designed for satellite two way time transfer. In: 7th European Frequency and Time Forum, March 1993, Neuchatel, Switzerland.

Davis, J A; Pearce, P R (1995) Time dissemination in the United Kingdom using signals from geostationary television satellites. In: BEMC '95 - 7th British Electromagnetic Measurements Conference Digest, November 1995, Malvern, UK.

Davis, J A; Pearce, P R; Bartle, K A (1995) Sources of error in two-way satellite time and frequency transfers. In: BEMC 95 - 7th British Electromagnetic Measurements Conference Digest, November 1995, Malvern, UK.

Davis, J A; Rougeaux, B (1999) The development of a computer model of a GPS disciplined oscillator to aid error budget determination. In: Proc. 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium, 13-16 April 1999, Besancon, France.

Davis, J A; Shemar, S L; Whibberley, P B (2011) A Kalman filter UTC(k) prediction and steering algorithm. In: 2011 Joint Conference of the IEEE International Frequency Control Symposium/ European Frequency and Time Forum Proceedings, 1-5 May 2011, San Francisco, USA.

Davis, J A; Steele, J McA * (1997) A Caesium flying clock experiment between NPL and USNO. In: Proc. EFTF 97, European Frequency and Time Forum, March 1997, Neuchatel, Switzerland.

Defraigne, P*; Sesia, I*; Cerretto, G*; Signorile, G*; Calonico, D*; Cantoni, E*; De Stefano, C*; Formichella, V*; Costa, R*; Cernigliaro, A*; Fiasca, F*; Perucca, A*; Samperi, A*; Cerabolini, P*; Rotiroti, L*; Simonetti, A*; Colombo, A*; Dhiri, V*; Giulianini, E*; Defraigne, P*; Ozdemir, N*; Veiga, M T*; Suarez, T*; Gandara, M*; Puech, P L*; Hamoniaux, V*; Mangiantini, M*; Varriale, E*; Morante, Q*; Wallin, A E*; Widomski, T*; Kaczmarek, J*; Uzycki, J*; Borgulski, K*; Olbrysz, P*; Kowalski, J*; Galleani, L*; Hindley, D (2015) The Horizon 2020 DEMETRA project: DEMonstrator of EGNSS services based on time reference architecture. In: 2nd IEEE International Workshop on Metrology for Aerospace (MetroAeroSpace), 4-5 June 2015, Benevento, Italy.

Defraigne, P*; Tavella, P*; Sesia, I*; Cerretto, G*; Signorile, G*; Calonico, D*; Costa, R*; Clivati, C*; Cantoni, E*; De Stefano, C*; Frittelli, M*; Formichella, V*; Biserni, E*; Leone, V*; Zarroli, E*; Sormani, D*; Gandara, M*; Hamoniaux, V*; Varriale, E*; Morante, Q*; Widomski, T*; Kaczmarek, J*; Uzycki, J*; Borgulski, K*; Olbrysz, P*; Kowalski, J*; Cernigiliaro, A*; Fiasca, F*; Perucca, A*; Dhiri, V*; Veiga, M T*; Suarez, T*; Mangiantini, M*; Wallin, A E*; Galleani, L*; Hindley, D (2017) Demonstrator of time services based on European GNSS signals: the H2020 DEMETRA project. In: Proceedings of the 48th Annual Precise Time and Time Interval Systems and Applications Meeting, 30-31 January 2017, Monterey, CA, USA.

Del Bino, L; Silver, J M; Stebbings, S L; Del'Haye, P (2017) Symmetry breaking of counter-propagating light in an a nonlinear resonator. Sci. Rep., 7. p. 43142.

Del'Haye, P; Coillet, A*; Fortier, T*; Beha, K*; Cole, D C*; Yang, K Y*; Lee, H*; Vahala, K J*; Papp, S B*; Diddams, S A* (2016) Phase-coherent microwave-to optical link with a self-referenced microcomb. Nature Photonics, 10 (8). pp. 516-520.

Delva, P*; Lodewyck, J*; Bilicki, S*; Bookjans, E*; Vallet, G*; Le Target, R*; Pottie, P E*; Guerlin, C*; Meynadier, F*; Le Poncin-Lafitte, C*; Lopez, O*; Amy-Klein, A*; Lee, W K*; Quintin, N*; Lisdat, C*; Al-Masoudi, A*; Dorscher, S*; Grebing, C*; Grosche, G*; Kuhl, A*; Raupach, S*; Sterr, U*; Hill, I R; Hobson, R; Bowden, W; Kronjager, J; Marra, G; Rolland, A; Baynes, F N; Margolis, H S; Gill, P (2017) Test of special relativity using a fiber network of optical clocks. Phys. Rev. Lett., 118 (22). 221102

Dolezal, M*; Balling, P*; Nisbet-Jones, P B R; King, S A; Jones, J M; Klein, H A; Gill, P; Lindvall, T*; Wallin, A E*; Merimaa, M*; Tamm, C*; Sanner, C*; Huntemann, N*; Scharnhorst, N*; Leroux, I D*; Schmidt, P O*; Burgermeister, T*; Mehlstaubler, T E*; Peik, E* (2015) Analysis of thermal radiation in ion traps for optical frequency standards. Metrologia, 52 (6). pp. 842-856.

E

Edwards, C S; Barwood, G P; Bell, S A; Gill, P; Stevens, M (2001) A tunable diode laser absorption spectrometer for moisture measurements in the low ppbv range. Meas. Sci. Technol., 12. pp. 1214-8.

Edwards, C S; Barwood, G P; Gill, P; Rodriguez-Llorente, F*; Rowley, W R C (1996) Frequency-stabilised diode lasers in the visible region using Doppler-free iodine spectra. Opt. Commun.,, 132. pp. 94-100.

Edwards, C S; Barwood, G P; Gill, P; Rodriguez-Llorente, F*; Rowley, W R C (1996) Stability measurement of 637nm extended cavity diode lasers stabilised to Doppler-free iodine spectra. In: Proc. Fifth symposium on Frequency Standards and Metrology, 1996, Singapore.

Edwards, C S; Barwood, G P; Gill, P; Rowley, W R C (1999) A 633nm iodine-stabilised diode laser frequency standard. Metrologia, 36 (1). pp. 41-45.

Edwards, C S; Barwood, G P; Gill, P; Rowley, W R C (1995) Absolute frequency stabilisation of a 637nm laser diode using Doppler-free I2 spectra. Electron. Lett., 31 (10). pp. 796-797.

Edwards, C S; Barwood, G P; Gill, P; Rowley, W R C (2002) Development of a 778 nm rubidium two-photon diode laser frequency standard. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

Edwards, C S; Barwood, G P; Gill, P; Schirmer, B*; Venzke, H*; Melling, A* (1999) Development of an IR tunable diode laser absorption spectrometer for trace humidity measurements at atmospheric pressure. Appl. Opt., 38 (21). pp. 4699-4704.

Edwards, C S; Barwood, G P; Patel, P D; Gill, P; Benabid, F*; Wheeler, N V*; Tandoi, G*; Ironside, C N* (2012) Development and evaluation of compact acetylene frequency standards. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Edwards, C S; Gill, P; Klein, H A; Levick, A P; Rowley, W R C (1994) Laser-cooling effects in few-ion clouds of Yb/sup +/. Appl. Phys. B, Laser and Optics, B59 (2). 179 - 185

Edwards, C S; Gill, P; Klein, H A; Levick, A P; Rowley, W R C (1994) Precision measurement of the 2S1/2(2 sps-1/2 sbs) - 2D5/2(2 sps-5/2 sbs) 411 nm transition in laser-cooled 172Yb+ (172 & + in sps) ions. In: 5th European Quantum Electronics Conference, Technical Digest, 53, 1994, Amsterdam, Holland.

Edwards, C S; Gill, P; Taylor, P (2000) Experimental verification of a swept-frequency laser interferometer for distance measurement. NPL Report. CBTLM 4

Edwards, C S; Margolis, H S; Barwood, G P; Lea, S N; Gill, P; Rowley, W R C (2006) Development of a pair of 1.5 micron NICE ohms frequency standards. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Edwards, C S; Patel, P D; Barwood, G P; Gill, P (2009) Development of a compact 1.55 µm acetylene standard using a widely tunable DSDBR diode laser. In: 9th Optical Fibre Measurement Conference (OFMC) Digest, 16-18 September 2009, NPL, Teddington,UK.

English, E L; Whibberley, P B; Langham, C; Hicks, D; Lobo, L (2017) Update on the NPL Time (R) service and future developments with white rabbit. In: Proceedings of the 48th Annual Precise Time and Time Interval Systems and Applications Meeting, 30-31 January 2017, Monterey, CA, USA.

Ertmer, W*; Schubert, C*; Wendrich, T*; Gilowski, M*; Zaiser, M*; von Zoest, T*; Rasel, E*; Borde, C J*; Clairon, A*; Laurent, P*; Lemonde, P*; Santarelli, G*; Schleich, W*; Cataliotti, F S*; Inguscio, M*; Poli, N*; Sorrentino, F*; Modugno, C*; Tino, G M*; Gill, P; Klein, H A; Margolis, H S; Reynaud, S*; Salomon, C*; Lambrecht, A*; Peik, E*; Jentsch, C*; Johann, U*; Rathke, A*; Bouyer, P*; Cacciapuoti, L*; De Natale, P*; Christophe, B*; Foulon, B*; Touboul, P*; Maleki, L*; Yu, N*; Turyshev, S G*; Anderson, J D*; Schmidt-Kaler, F*; Walser, R*; Vigue, J*; Buchner, M*; Angonin, M C*; Delva, P*; Tourrenc, P*; Bingham, R*; Kent, B*; Wicht, A*; Wang, L J*; Bongs, K*; Dittus, H*; Lammerzahl, C*; Theil, S*; Sengstock, K*; Peters, A*; Muller, T*; Arndt, M*; Iess, L*; Bondu, F*; Brillet, A*; Samain, E*; Chiofalo, M L*; Levi, F*; Calonico, D* (2009) Matter wave explorer of gravity (MWXG). Exp. Astron., 23 (2). pp. 611-649.

Esteban, H*; Galindo, F J*; Whibberley, P B; Bauch, A*; Polewka, T*; Uhrich, P*; Chupin, B*; Cerretto, G*; Costa, R*; Zhiheng Jiang*, (2015) GPS time link calibrations in the frame of EURAMET Project 1156. In: 2015 Joint Conference Of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum (FCS), 12-16 April 2015, Denver, CO, USA.

F

Fitzau, O*; Herper, M*; Giesberts, M*; Nicklaus, K*; Barwood, G P; Williams, R A; Gill, P; Koegel, H*; Hoffman, H D* (2015) High stability single-frequency Yb fiber amplifier for next generation gravity missions. Proc. SPIE - Int. Soc. Opt. Eng., 9344. 93440B

Flowers, J L; Baird, P E G*; Evans, A*; Klein, H A; Langham, C D; Mairiniac, L*; Margolis, H S; Walton, B R (2008) Optical spectroscopy of atomic hydrogen for an improved determination of the Rydberg constant. In: Proceedings of the 7th Symposium on Frequency Standards and Metrology., 5-11 October 2008, Pacific Grove, California, USA.

Flowers, J L; Klein, H A; Knight, D J E; Margolis, H S (2001) Hydrogenic systems for calculable frequency standards: status and options. NPL Report. CBTLM 11

Furlong, J M; Davis, J A (1997) Suitabilty of using GPS disciplined oscillators as time and frequency standards traceable to the UK National Time Scale. In: Proc. 8th International Conference on Electromagnetic Measurement, 4-6 November 1997, National Physical Laboratory, Teddington.

G

Gartman, R*; Chalupczak, W (2015) Amplitude-modulate indirect pumping of spin orientation in low-density cesium vapor. Phys. Rev. A, 91 (5). 053419

Georgakopoulos, D; Wright, P S (2007) Exercising the dynamic range of active power meters under nonsinusoidal conditions. IEEE Trans. Instrum. Meas., 56 (2). pp. 369-372.

Gibble, K*; Lea, S N; Szymaniec, K (2012) A microwave cavity designed to minimize distributed cavity phase errors in a primary cesium frequency standard. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Gill, P (1997) Applications of laser cooled trapped ions. In: Proc. URSI General Assembly, 29 August 1997, Lille, France.

Gill, P (2016) Is the time right for a redefinition of the second by optical atomic clocks? J. Phys.: Conf. Ser., 723 (1). 012053

Gill, P (1993) Laser interferometry for precision engineering. In: Optical Methods in Engineering Metrology. Chapman & Hall, London, pp. 153-177.

Gill, P (2000) Optical Clocks coming of age. Nature, 407 (6804). pp. 579-580.

Gill, P (2001) Raising the standards (in 'Science perspective on atomic clocks'). Science, 294 (5547). pp. 1666-8.

Gill, P (2008) Ultrafast optics femtosecond timing distribution. Nature Photonics, 2. pp. 711-712.

Gill, P (2011) When should we change the definition of the second? Philos. Trans. R. Soc. Lond. A, Math. Phys. Eng. Sci., 369 (1953). pp. 4109-4130.

Gill, P; Barwood, G P (2003) Ion trapping and laser applications to length and time metrology. In: Handbook of Laser Technology and Applications. IOP, Bristol, UK, pp. 2485-2506.

Gill, P; Barwood, G P; Klein, H A; Huang, G; Webster, S A; Blythe, P J; Hosaka, K; Lea, S N; Margolis, H S (2003) Trapped ion optical frequency standards. Meas. Sci. Technol., 14 (8). pp. 1174-1186.

Gill, P; Huang, G; Lea, S N; Margolis, H S (2000) An optical frequency chain for absolute frequency measurement of the 445 THz strontium trapped ion frequency standard. In: Conference on Precision Electromagnetic Measurements (CPEM) 2000, 14-19 May 2000, Sydney, Australia.

Gill, P; Klein, H A; Levick, A P; Roberts, M; Rowley, W R C; Taylor, P (1994) A search for the 2S1/2 (2 sps - 1/2sbs) - 2F7/2 (2 sps -7/2sbs) 467 nm transition in laser cooled 172Yb+. (172 & + sps). In: 14th International Conference Digest on Atomic Physics, 1994, Boulder, Colorado, USA.

Gill, P; Klein, H A; Levick, A P; Rowley, W R C; Taylor, P (1995) Measurement of the 2S1/2 - 2D5/2 411 nm interval in laser-cooled 172Yb+ ions. Phys. Rev. A, At. Mol. Opt. Phys., 52. R909-912

Gill, P; Klein, H A; Roberts, M; Rowley, W R C; Taylor, P (1996) Absolute measurement of the 2S1/2 - 2D5/2 411nm interval, and the search for the 2S1/2 - 2F7/2 467nm transition in laser-cooled trapped 172Yb+. In: Proc. Fifth symposium on Frequency Standards and Metrology, 1996, Singapore.

Gill, P; Riehle, F* (2012) Possibilities for a future redefinition of the second. In: 2012 Conference on Precision Electromagnetic Measurements (CPEM 2012), 1-6 July 2012, Washington DC, USA.

Godun, R M; Nisbet-Jones, P B R; Jones, J M; King, S A; Johnson, L A M; Margolis, H S; Szymaniec, K; Lea, S N; Bongs, K*; Gill, P (2014) Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time-variation of fundamental constants. Phys. Rev. Lett., 113 (21). 210801

Grainge, K*; Alachkar, B*; Amy, S*; Barbosa, D*; Bommineni, M*; Boven, P*; Braddock, R*; Davis, J; Diwakar, P*; Francis, V*; Gabrielczyk, R*; Gamatham, R*; Garrington, S*; Gibbon, T*; Gozzard, D*; Gregory, S*; Guo, Y*; Gupta, Y*; Hammond, J*; Hindley, D.; Horn, U*; Hughes-Jones, R*; Hussey, M*; Lloyd, S*; Mammen, S*; Miteff, S*; Mohile, V*; Muller, J*; Natarajan, S*; Nicholls, J*; Oberland, R*; Pearson, M*; Rayner, T*; Schediwy, S*; Schilizzi, R*; Sharma, S*; Stobie, S*; Tearle, M*; Wang, B *; Wallace, B*; Wang, L*; Warange, R*; Whitaker, R*; Wilkinson, A*; Wingfield, N* (2017) Square kilometre array: the radio telescope of the XXI century. Astron. Rep., 61 (4). pp. 288-296.

Grop, S*; Bourgeois, P Y*; Bazin, N*; Kersale, Y*; Rubiola, E*; Langham, C; Oxborrow, M; Clapton, D*; Walker, S; de Vicente, J*; Giordano, V* (2010) ELISA: A cryocooled 10 GHz oscillator with 10 (-15) frequency stability. Rev. Sci. Insrum., 81 (2). 025102

Grop, S*; Schafer, W*; Bourgeois, P Y*; Kersale, Y*; Oxborrow, M; Rubiola, E*; Giordano, V* (2011) Unprecedented long-term frequency stability with a microwave resonator oscillator. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 58 (8). pp. 1694-1697.

Guarrera, V; Moore, R; Bunting, A; Vanderbruggen, T; Ovchinnikov, Y B (2017) Distributed quasi-Bragg beam splitter in crossing atomic waveguides. Sci. Rep., 7. p. 4749.

Gubin, M*; Kovalchuk, E*; Petrukhin, E*; Shelkovnikov, A*; Tyurikov, D*; Gamidov, R*; Erdogan, C*; Sahin, E*; Felder, R*; Gill, P; Lea, S N; Kramer, G*; Lipphardt, B* (2002) Absolute frequency measurements with a set of transportable He-Ne/CH4 optical frequency standards and prospects for future design and applications. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

H

Harris, P M; Davis, J A; Cox, M G; Shemar, S L (2003) Least-squares anaylsis of time series data and its application to two-way satellite time and frequency transfer measurements. Metrologia, 40 (3). S342-S347

Hein, G*; Moudrak, A*; Klein, H A; Eissfeller, B* (2008) Opportunities for using optical clocks in GNSS systems. Inside GNSS (Sept/O). pp. 45-50.

Henderson, D (2005) Essen and the National Physical Laboratory's atomic clock. Metrologia, 42 (3). S4-S9.

Henderson, D; Lea, S N; Szymaniec, K; Whibberley, P B (2001) Towards a caesium fountain frequency standard at the NPL. In: Proceedings of the 15th European Frequency and Time Forum (EFTF), March 2001, Neuchatel, Switzerland.

Henderson, D; Lea, S N; Szymaniec, K; Whibberley, P B (2001) Towards a ceasium fountain frequency standard at the NPL. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

Henderson, D; Whibberley, P B; Szymaniec, K; Lea, S N (1999) Towards a caesium fountain frequency standard at NPL. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, November 1999, Brighton, UK.

Hicks, D; Whibberley, P; English, E L; Lobo, L; Lee, T*; Austin, A* (2016) NPLTime (R) - UTC traceable time for the financial sector. pp. 167-173.

Hill, I R*; Hobson, R*; Bowden, W*; Bridge, E M*; Donnellan, S*; Curtis, E A*; Gill, P (2016) A low maintenance Sr optical lattice clock. J. Phys.: Conf. Ser., 723 (1). 012019

Hill, I R*; Ovchinnikov, Y B; Bridge, E M*; Curtis, E A*; Donnellan, S*; Gill, P (2013) A simple, configurable, permanent magnet Zeeman Slower for Sr. In: 2012 European Frequency and Time Forum (EFTF 2012), 23-27 April 2012, Gothenburg, Sweden.

Hill, I R*; Ovchinnikov, Y B; Bridge, E M*; Curtis, E A*; Gill, P (2014) Zeeman slowers for strontium based on permanent magnets. J. Phys. B, At. Mol. Opt. Phys., 47 (7). 075006

Hobson, R; Bowden, W; King, S A; Baird, P E G*; Hill, I R; Gill, P (2016) Modified hyper-Ramsey methods for the elimination of probe shifts in optical clocks. Phys. Rev. A, 93 (1). 010501

Hodge, C (1996) Proceedings of the GNSS 2 workshop: The frontiers of time and frequency measurement. NPL Report. QM 123

Hodge, C; Davis, J A (1996) Timing options and frequency control concepts for meeting user requirements with the second-generation global navigation satellite system (GNSS2). In: Tenth European Frequency and Time Forum, Institute of Electrical Engineers, 1996, London.

Hodge, C; Davis, J A; Gallop, J C; Allan, D W*; Ashby, N*; Bedrich, S*; Cutler, L S*; Hahn, J*; Nau, H*; Kern, R H*; Lewandowski, W*; Maleki, L*; Vessot, R F C* (1996) Towards 10 millimetre real-time position determination and 30 picosecond time-transfer capability with the next-generation of global navigation satellite systems (GNSS). In: Proc. ION GPS-96, Session DI: GNSS and WAAS Architects, 17 - 20 September 1996, Kansas City, Missouri, USA.

Hosaka, K; Webster, S A; Stannard, A; Margolis, H S; Lea, S N; Walton, B R; Gill, P (2006) An 171Yb+ optical frequency standard at 467 nm. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Hosaka, K; Webster, S A; Stannard, A; Margolis, H S; Lea, S N; Walton, B R; Gill, P (2006) An 171Yb+ optical frequency standard at 467 nm. In: CPEM 2006 Conference on Precision Electromagnetic Measurements, 9-14 July 2006, Torino, Italy.

Hosaka, K*; Webster, S A; Stannard, A*; Walton, B R; Margolis, H S; Gill, P (2009) Frequency measurement of the 2S1/2 - 2D3/2 electric quadrupole transition in a single 171Yb+ ion. Phys. Rev. A, 79 (3). 033403

Hou, L P*; Haji, M; Eddie, I*; Zhu, H L*; March, J H* (2015) Laterally-coupled dual-grating distributed feedback lasers for generating mode-beat terahertz signals. In: 2015 Conference on Lasers and Electro-Optics (CLEO) Proceedings, 10-15 May 2015, San Jose, CA, USA.

Hou, L P*; Haji, M; Eddie, I*; Zhu, H L*; Marsh, J H* (2015) Laterally coupled duel-grating distributed feedback lasers for generating mode-beat terahertz signals. Opt. Lett., 40 (2). pp. 182-185.

J

Johnson, L A M; Gill, P; Margolis, H S (2015) Evaluating the performance of the NPL femtosecond frequency combs: agreement at the 10 -21 level. Metrologia, 52 (1). pp. 62-71.

K

Kim, J*; Marra, G; Wu, D S*; Richardson, D J*; Slavik, R* (2016) Wavelength conversion technique for optical frequency dissemination applications. Opt. Lett., 41 (8). pp. 1716-1719.

Kim, J*; Schnatz, H*; Wu, D S*; Marra, G; Richardson, D J*; Slavik, R* (2015) Optical injection locking based amplification in phase coherent transfer of optical frequencies. Opt. Lett., 40 (18). pp. 4198-4201.

Kim, J*; Wu, D S*; Marra, G; Richardson, D J*; Slavik, R* (2014) Stability characterization of an optical injection phase locked loop for optical frequency transfer applications. In: 2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications., 8-13 June 2014, San Jose, USA.

King, S A; Godun, R M; Webster, S A; Margolis, H S; Johnson, L A M; Szymaniec, K; Baird, P E G*; Gill, P (2012) Absolute frequency measurement of the 2S- 1/2 - 2F-2 7/2) electric octupole transition in a single ion of Yb-171(+) with 10(-15) fractional uncertainty. New J. Phys., 14 (1). 013045

Klein, H A; Barwood, G P; Gill, P; Huang, G (2000) Single trapped ions for optical frequency standards. Phys. Scr. Vol. T, 86. pp. 33-37.

Klein, H A; Knight, D J E (1999) A study of ultra-stable optical clocks, frequency sources and standards for space applications. NPL Report. CBTLM 2

Klein, H A; Knight, D J E*; Plimmer, M D*; Silver, J D* (2002) DTI scouting mission to Japan on Trapped Ions for Measurement and Enterprise (TIME) 26th - 30th November 2001. NPL Report. CBTLM 17

L

Langham, C D; Gallop, J C (1995) Performance of dielectric loaded superconducting resonators as frequency standards. Appl. Supercond.. pp. 1199-1202.

Laverty, J R (1999) Time and frequency dissemination in the UK. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, 2-4 November 1999, Brighton, UK.

Lea, S N (2007) Limits to time variation of fundamental constants from comparisons of atomic frequency standards. Rep. Prog. Phys., 70 (9). pp. 1473-1523.

Lea, S N (2008) Limits to time variation of fundamental constants from comparisons of atomic frequency standards. Eur. Phys. J. Special Topics, 163 (1). pp. 37-54.

Lea, S N; Burt, E A*; Prestage, J D*; Taghavi, S*; Tjoelker, R L* (2008) A dual-isotope mercury ion clock to search for variation in fundamental constants. In: 7th Symposium on Frequency Standards and Metrology, 5-11 October 2008, Pacific Grove, California, USA.

Lea, S N; Gill, P (1996) Proposed infra-red to visible frequency chain at NPL. In: Proc. Fifth symposium on Frequency Standards and Metrology, 1996, Singapore.

Lea, S N; Huang, G; Margolis, H S; Gill, P (2004) Extending the range and utility of femtosecond combs. In: Conference on Precision Electromagnetic Measurements (CPEM) 2004, 27 June - 2 July 2004, London, UK.

Lea, S N; Huang, G; Margolis, H S; Gill, P (2001) Femtosecond laser combs for optical measurement at NPL. In: 15th European Frequency and Time Forum., 2001.

Lea, S N; Huang, G; Margolis, H S; Macfarlane, G M; Taylor, P; Gill, P (1999) Optical frequency synthesis in the near IR with application to trapped ion standards. In: Proc. 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symp., 13-16 April 1999, Besancon, France.

Lea, S N; Macfarlane, G M; Gill, P (1999) Progress towards an optical frequency chain at NPL. IEEE Trans. Instrum. Meas., 48 (2). pp. 578-582.

Lea, S N; Macfarlane, G M; Huang, G; Gill, P (1998) Progress towards an optical frequency chain at NPL. In: CPEM '98 Conference on Precision Electromagnetic Measurements Conference Digest, 6-10 July 2003, Washington DC, USA.

Lea, S N; Margolis, H S; Huang, G; Barwood, G P; Klein, H A; Blythe, P J; Webster, S A; Rowley, W R C; Gill, P; Windeler, R S* (2002) Femtosecond comb measurements of optical frequency standards at NPL. In: IEEE-LEOS 2002 15th Annual Meeting of the IEEE Lasers and Electo-Optics Society., 10-14 November 2002, Glasgow, UK.

Lea, S N; Margolis, H S; Huang, G; Rowley, W R C; Gill, P; Windeler, R S* (2002) Femtosecond optical frequency comb measurements at NPL. In: 2002 Conference on Precision Electromagnetic Measurements (CPEM), 16-21 June 2002, Ottawa, Canada.

Lea, S N; Margolis, H S; Huang, G; Rowley, W R C; Henderson, D; Barwood, G P; Klein, H A; Webster, S A; Blythe, P; Gill, P (2002) Femtosecond optical frequency comb measurements of lasers stabilised to transitions in 88Sr+, 171Yb+ and I2 at NPL. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

Lea, S N; Rowley, W R C; Margolis, H S; Barwood, G P; Huang, G; Gill, P; Chartier, J.-M*; Windeler, R S* (2003) Absolute frequency measurements of 633 nm iodine-stabilised helium-neon lasers. Metrologia, 40. pp. 84-88.

Lea, S N; Taghavi-Larigani, S*; Burt, E A*; Prestage, J D*; Tjoelker, R L* (2009) A New Trapped Ion Clock Based On 201Hg+. In: European Frequency and Time Forum – International Frequency Control Symposium) EFTF-IFCS Joint Conference 2009, 20-24 April 2009, Besancon, France.

Lessing, M; Margolis, H S; Brown, C T A*; Marra, G (2017) Frequency comb-based time transfer over a 159 km long fiber network. Appl. Phys. Lett., 110 (22). 221101

Lessing, M*; Margolis, H S; Brown, C T A*; Gill, P; Marra, G (2013) Suppression of amplitude-to-phase noise conversion in balanced optical-microwave phase detectors. Opt. Express, 21 (22). pp. 27057-27062.

Lessing, M*; Margolis, H S; Brown, C T A*; Marra, G (2015) Simultaneous time and frequency transfer over a 158-km-long fiber network using a mode-locked laser. In: 2015 Conference on Lasers and Electro-Optics (CLEO), 10-15 May 2015, San Jose, CA, USA.

Letchumanan, V; Gill, P; Riis, E*; Sinclair, A G (2004) Optical ramsey spectroscopy of a single trapped 88Sr+ ion. Phys. Rev. A, At. Mol. Opt. Phys., 70. 033419

Leute, J*; Huntemann, N*; Lipphardt, B*; Tamm, C*; Nisbet-Jones, P B R; King, S A; Godun, R M*; Jones, J M*; Margolis, H S; Whibberley, P B; Wallin, A*; Merimaa, M*; Gill, P; Peik, E* (2016) Frequency comparison of 171Yb+ ion optical clocks at PTB and NPL via GPS PPP. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 63 (7). pp. 981-985.

Li, R X*; Gibble, K*; Szymaniec, K (2011) Improved accuracy of the NPL-CsF2 primary frequency standard: evaluation of distributed cavity phase and microwave lensing frequency shifts. Metrologia, 48 (5). pp. 283-289.

M

Ma, L S*; Picard, S*; Zucco, M*; Chartier, J-M*; Robertsson, L*; Balling, P*; Krin, P*; Jin Qian*,, ; Zhongyou Liu*,, ; Chunying Shi*,, ; Alonso, M V*; Gan Xu*,, ; Siew Leng Tan*,, ; Nyholm, K*; Henningsen, J*; Hald, J*; Rowley, W R C; Barwood, G P; Windeler, R* (2006) Absolute frequency measurement of the R(12) 26-0 and R(106) 28-0 transitions in 127I2 at =543nm. IEEE Trans. Instrum. Meas., 55 (3). pp. 876-880.

Macfarlane, G M; Barwood, G P; Rowley, W R C; Gill, P (1999) Interfeometric frequency measurements of an iodine stabilised Nd:YAG laser. IEEE Trans. Instrum. Meas., 48 (2). pp. 600-603.

Macfarlane, G M; Barwood, G P; Rowley, W R C; Gill, P (1998) Interferometric frequency measurements of an iodine stabilised Nd:YAG laser. In: Proc. 1998 CPEM Digest, July 1998, Washington, DC, USA.

Macfarlane, G M; Barwood, G P; Rowley, W R C; Gill, P (1998) Interferometric frequency measurements of an iodine stabilised Nd:YAG laser. In: CPEM '98 Conference on Precision Electromagnetic Measurements Conference Digest, 6-10 July 2003, Washington DC, USA.

Margolis, H S (2009) Frequency metrology and clocks. J. Phys. B, At. Mol. Phys., 42 (15). 154017

Margolis, H S (2013) How big is the proton? Science, 339 (6118). pp. 405-406.

Margolis, H S (2009) Lattice clocks embrace ytterbium. Nature Photonics, 3 (10). pp. 557-558.

Margolis, H S (2007) Moving metrology. Nature Photonics, 1 (5). pp. 258-259.

Margolis, H S (2013) Opportunities knock with a more stable optical clock. Science, 341 (6151). pp. 1185-1186.

Margolis, H S (2014) Optical atomic clocks in ion traps. pp. 261-274.

Margolis, H S (2010) Optical frequency standards and clocks. Contemp. Phys., 51 (1). pp. 37-58.

Margolis, H S (2012) Spectroscopic applications of femtosecond optical frequency combs. Chem. Soc. Rev., 41 (15). pp. 5174-5184.

Margolis, H S (2014) Timekeepers of the future. Nature Physics, 10 (2). pp. 82-83.

Margolis, H S (2009) Trapped ion optical clocks. Eur. Phys. J. Special Topics, 172. pp. 97-107.

Margolis, H S; Barwood, G P; Blythe, P J; Gill, P; Hosaka, K; Huang, G; Klein, H A; Lea, S N; Webster, S A (2003) Trapped ion optical Frequency standards and metrology. In: Digest of LEOS Summer Topical Meeting on Photonic Time/Frequency Measurement and Control, 14-16 July 2003, Vancouver, Canada.

Margolis, H S; Barwood, G P; Huang, G; Klein, H A; Lea, S N; Marra, G; Tsatourian, V; Walton, B R; Gill, P (2008) An optical clock based on a single trapped 88Sr+ ion. In: Proceedings of the 7th Symposium on Frequency Standards and Metrology., 5-11 October 2008, Pacific Grove, California, USA.

Margolis, H S; Barwood, G P; Huang, G; Klein, H A; Lea, S N; Szymaniec, K; Gill, P (2004) Hertz-level measurement of the optical clock frequency in a single 88Sr+ ion. Science, 306 (5700). pp. 1355-1358.

Margolis, H S; Gill, P (2016) Determination of optimized frequency and frequency ratio values from over-determined sets of clock comparison data. J. Phys.: Conf. Ser., 723. 012060

Margolis, H S; Gill, P (2015) Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values. Metrologia, 52 (5). pp. 628-634.

Margolis, H S; Godun, R M*; Gill, P; Johnson, L A M*; Shemar, S L*; Whibberley, P B; Calonico, D*; Levi, F*; Lorini, L*; Pizzocaro, M*; Delva, P*; Bize, S*; Achkar, J*; Denker, H*; Timmen, L*; Voigt, C*; Falke, S*; Piester, D*; Lisdat. C*,, ; Sterr, U*; Vogt, S*; Weyers, S*; Gersl, J*; Lindvall, T*; Merimaa, M* (2013) International timescales with optical cloacks (ITOC). In: 2013 Joint European Frequency and Time Forum & International Frequency COntrol Symposium (EFTF/IFC 2013), 21-25 July 2013, Prague, Czech Republic.

Margolis, H S; Huang, G; Barwood, G P; Lea, S N; Klein, H A; Rowley, W R C; Gill, P; Windeler, R S* (2003) Absolute frequency measurement of the 674 nm 88Sr+ clock transition using a femtosecond optical frequency comb. Phys. Rev. A, At. Mol. Opt. Phys., 67. 032501

Margolis, H S; Lea, S N; Huang, G; Gill, P (2000) A 3 THz wide optical frequency comb for the NPL methance-to-stontium frequency chain. In: 14th EFTF Conf. Proc., 2000.

Margolis, H S; Lea, S N; Walton, B R; Marra, G; Reid, D T*; Gill, P (2008) Improvements to the robustness of a Ti: sapphire-based femtosecond comb at NPL. In: Proceedings of the 7th Symposium on Frequency Standards and Metrology., 5-11 October 2008, Pacific Grove, California, USA.

Marra, G; Lea, S N; Margolis, H S; Gill, P (2008) Fibre transfer of high stability microwave references with optical frequency combs. In: 2008 Lasers and Electro-optics and Quantum Electronics and Laser Science Conference, 4-9 May 2008, San Jose, CA, USA.

Marra, G; Lea, S N; Margolis, H S; Gill, P (2008) Microwave and optical frequency transfer via optical fibre. In: Proceedings of the 7th Symposium on Frequency Standards and Metrology., 5-11 October 2008, Pacific Grove, California, USA.

Marra, G; Margolis, H S; Lea, S N; Gill, P (2010) High-stability microwave frequency transfer by propagation of an optical frequency comb over 50 km of optical fiber. Opt. Lett., 35 (7). pp. 1025-1027.

Marra, G; Margolis, H S; Richardson, D J* (2012) Dissemination of an optical frequency comb over fiber with 3 x 10(-18) fractional accuracy. Opt. Express, 20 (2). pp. 1775-1782.

Marra, G; Margolis, H S; Richardson, D J* (2012) Dissemination of an optical frequency comb over fiber with 3 x 10(-18) fractional accuracy. In: 2012 Conference on Lasers and Electro-optics (CLEO), 6-11 May 2012, San Jose, CA, USA.

Marra, G; Slavik, R*; Margolis, H S; Lea, S N; Petropoulos, P*; Richardson, D J*; Gill, P (2011) High resolution microwave frequency transfer over a 86 km-long optical fiber network using a mode-locked laser.. Opt. Lett., 36 (4). pp. 511-513.

Matus, M*; Edwards, C; Margolis, H S; Piree, H*; Sahin, E*; Birlikseven, C*; Robertsson, L* (2015) The CCL-K11 ongoing key comparison. Final report for the year 2013. Metrologia, 52 (1A). 04006.

N

Naeem, M A*; Haji, M; Holmes, B M*; Hutchings, D C*; Marsh, J H*; Kelly, A E* (2015) Generation of high speed polarization modulated data using a monolithically integrated device. IEEE J. Sel. Top. Quantum Electron., 21 (4). 3400205

Nevsky, A*; Alighanbari, S*; Chen, Q F*; Ernstring, I*; Vasilyev, S*; Schiller, S*; Barwood, G P; Gill, P; Poli, N*; Tino, G M* (2013) Robust frequency stabilization of multiple spectroscopy lasers with large and tunable offset frequencies. Opt. Lett., 38 (22). pp. 4903-4906.

Nisbet-Jones, P B R; King, S A; Jones, J M; Godun, R M; Baynham, C F A; Bongs, K*; Dolezal, M*; Balling, P*; Gill, P (2016) A single-ion trap with minimized ion-environment interactions. Appl. Phys. B, Laser Opt., 122 (3). p. 57.

O

Oldham, N*; Nelson, T*; Bergeest, R*; Carranza, R*; Gibbes, A M*; Jones, K*; Kyriazis, G*; Laiz, H*; Liu, L X*; Lu, Z*; Pogliano, U*; Rydler, K-E*; Shapiro, E*; So, E*; Temba, M*; Wright, P S (2000) International comparison of 50/60 Hz power (1996-1999). In: Conference on Precision Electromagnetic Measurements (CPEM) 2000, 14-19 May 2000, Sydney, Australia.

Origlia, S*; Schiller, S*; Pramod, M S*; Smith, L*; Singh, Y*; He, W*; Viswam, S*; Swierad, D*; Hughes, J*; Bongs, K*; Sterr, U*; Lisdat, C*; Vogt, S*; Bize, S*; Lodewyck, J*; Le Targat, R*; Holleville, D*; Venon, B*; Gill, P; Barwood, G P; Hill, I R; Ovchinnikov, Y B; Kulosa, A*; Ertmer, W*; Rasel, E M*; Stuhler, J*; Kaenders, W* (2016) Development of a strontium optical lattice clock for the SOC mission on the ISS. Proc. SPIE - Int. Soc. Opt. Eng., 9900. 990003

Oudmaijer, R D*; Parr, A M*; Baines, D; Porter, J M* (2008) Sub-millarcsecond precision spectro-astrometry of Be stars. Astron. Astrophys., 489 (2). pp. 627-631.

Ovchinnikov, B M*; Ovchinnikov, Y B; Parusov, V V* (2012) Massive liquid Ar and Xe detectors for direct Dark Matter searches. JETP Lett., 96 (3). pp. 149-152.

Ovchinnikov, Y B (2006) Coherent manipulation of atoms by copropagating laser beams. Phys. Rev. A, At. Mol. Opt. Phys., 73. 033404

Ovchinnikov, Y B (2005) Compact magneto-optical sources of slow atoms. Opt. Commun., 249. pp. 473-481.

Ovchinnikov, Y B (2013) Development of NPL Rb fountain frequency standard. In: 2012 European Frequency and Time Forum (EFTF 2012), 23-27 April 2013, Gothenburg, Sweden.

Ovchinnikov, Y B (2012) Longitudinal Zeeman slowers based on permanent magnetic dipoles. Opt. Commun., 285 (6). pp. 1175-1180.

Ovchinnikov, Y B (2004) A multimode waveguide interferometer. In: Focus on laser and electro-optics research. Nova Science Publishers, New York.

Ovchinnikov, Y B (2008) A permanent Zeeman slower for Sr atomic clock. Eur. Phys. J. Special Topics, 163. pp. 95-100.

Ovchinnikov, Y B; Marra, G (2011) Accurate rubidium atomic fountain frequency standard. Metrologia, 48 (3). pp. 87-100.

Ovchinnikov, Y B; Marra, G (2011) Reply to comment on "Accurate rubidium atomic frequency standard". Metrologia, 48 (5). pp. 448-449.

Ovchinnikov, Y B; Szymaniec, K; Edris, S* (2015) Measurement of rubidium ground-state hyperfine transition frequency using atomic fountains. Metrologia, 52 (4). pp. 595-599.

Oxborrow, M; Webster, S A; Gill, P (2002) Stability of ND:YAG 'flywheel' lasers locked to ultra-high-finesse etalons made from either ULE or mono-crystalline-sapphire. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

P

Parker, B; Marra, G; Johnson, L A M; Margolis, H S; Webster, S A; Wright, L; Lea, S N; Gill, P; Bayvel, P* (2014) Transportable cavity-stabilised laser system for optical carrier frequency transmission experiments. Appl. Opt., 53 (35). pp. 8157-8166.

Petit, G*; Thomas, C*; Moussay, P*; Davis, J A; Miranian, M* (1997) Multi-channel GPS common-view time transfer experiments: First results and uncertainty study for short and long baselines. In: Proc. 29th Annual Precise Time and Time Interval Systems and Applications meeting, December 1997, Long Beach, California.

Petley, B W (1997) Louis Essen, 1908-1997. Physics World (Novemb). p. 55.

Picard, S*; Razet, A*; Edwards, C S; Rodriguez-Llorente, F* (1996) Calculation of hyperfine structure constants of the 127I2 R(39) 7-4 transition at 637nm. Metrologia, 33. pp. 569-571.

Poli, N*; Oates, C W*; Gill, P; Tino, G M* (2013) Optical atomic clocks. Rivista del Nuovo Cimento, 36 (12). pp. 555-624.

R

Reid, D T*; Heyl, C M*; Thomson, R R*; Trebino, R*; Steinmeyer, G*; Fielding, H H*; Holzwarth, R*; Zhang, Z*; Del'Haye, P; Sudmeyer, T*; Mourou, G*; Tajima, T*; Faccio, D*; Harren, F J M*; Cerullo, G* (2016) Roadmap on ultrafast optics. J. Opt., 18 (9). 093006

Roberts, M; Taylor, P; Barwood, G P; Gill, P; Klein, H A; Rowley, W R C (1997) Observation of an electric octupole transition in a single Ion. Phys. Rev. Lett., 78 (10). pp. 1876-1879.

Roberts, M; Taylor, P; Barwood, G P; Rowley, W R C; Gill, P (2000) Observation of the 2S1/2-2F7/2 electric octupole transition in a single 171Yb+ ion. Phys. Rev. A, At. Mol. Opt. Phys., 62 (2). 020501(R)

Roberts, M; Taylor, P; Gateva-Kostova, S V*; Clarke, R B M*; Rowley, W R C; Gill, P (1999) Measurement of the 2S1/2-2D5/2 clock transition in a single 171Yb+ ion. Phys. Rev. A, At. Mol. Opt. Phys., 60 (4). pp. 2867-2872.

Roberts, M; Taylor, P; Gill, P (1999) Laser linewidth at the sub-Hertz level. NPL Report. CLM 8

Roberts, M; Taylor, P; Gill, P (1999) Single ion spectroscopy of ytterbium. In: 13th EFTF/ 1999 IEEE FCS Conference Proceedings, 1999.

Roddie, A G; Smith, A J A; Gifford, A D; Henderson, D (1995) Application of femosecond pulses to electrical metrology. In: BEMC 95 7th British Electromagnetic Measurements Conference Digest, 6-9 November 1995, Malvern.

S

Schiller, S*; Gorlitz, A*; Abou-Jaoudeh, C*; Mura, G*; Franzen, T*; Nevsky, A*; Alighanbari, S*; Chen, Q*; Ernsting, I*; Poli, N*; Schioppo, M*; Tino, G M*; Sterr, U*; Vogt, S*; Falke, S*; Lisdat, C*; Gill, P; Barwood, G P; Ovchinnikov, Y B; Rasel, E*; Kulosa, A*; Bongs, K*; Singh, Y*; Calonico, D*; Levi, F*; Stuhler, J*; Kaenders, W*; Bize, S*; Holtzwarth, R* (2013) Development of compact lattice optical clocks toward future space clocks. In: Lasers & Electro-Optics. Europe & International Quantum Electronics Conference (CLEO EUROPE/IQEC 2013), 12-16 May 2013, Munich, Germany.

Schiller, S*; Gorlitz, A*; Nevsky, A*; Alighanbari, S*; Vasilyev, S*; Abou-Jaoudeh, C*; Mura, G*; Franzen, T*; Sterr, U*; Falke, S*; Lisdat, C*; Rasel, E*; Kulosa, A*; Bize, S*; Lodewyck, J*; Tino, G M*; Poli, N*; Schioppo, M*; Bongs, K*; Singh, Y*; Gill, P; Barwood, G P; Ovchinnikov, Y B; Stuhler, J*; Kaenders, W*; Braxmaier, C*; Holzwarth, R*; Donati, A*; Lecomte, S*; Calonico, D*; Levi, F* (2013) The space optical clocks project: development of high-performance transportable and breadboard optical clocks and advanced subsystems. In: 2012 European Frequency and Time Forum (EFTF 2012), 23-27 April 2012, Gothenburg, Sweden.

Schiller, S*; Tino, G M*; Gill, P; Salomon, C*; Sterr, U*; Peik, E*; Nevsky, A*; Gorlitz, A*; Svehla, D*; Ferrari, G*; Poli, N*; Lusanna, L*; Klein, H A; Margolis, H S; Lemonde, P*; Laurent, P*; Santarelli, G*; Clairon, A*; Ertmer, W*; Rasel, E*; Muller, J*; Iorio, L*; Lommerzahl, C*; Dittus, H*; Gill, E*; Rothacher, M*; Flechner, F*; Schreiber, U*; Flambaum, V*; Ni, W T*; Liu, L*; Chen, X Z*; Chen, J B*; Gao, K L*; Cacciapuoti, L*; Holzwarth, R*; Hess, M P*; Schafer, W* (2009) Einstein Gravity Explorer-a medium-class fundamental physics mission. Exp. Astron., 22 (2). pp. 573-610.

See, P; Wilpers, G; Gill, P; Sinclair, A G (2013) Fabrication of a monolithic array of three dimensional Si-based ion traps. J. Microelectrochem. Syst., 22 (5). pp. 1180-1189.

Shemar, S; Fraser, G*.; Heil, L*; Hindley, D; Martindale, A*; Molyneux, P*; Pye, J*; Warwick, R*; Lamb, A* (2016) Towards practical autonomous deep-space navigation using X-ray pulsar timing. Exp. Astron., 42 (2). pp. 101-138.

Shemar, S L; Davis, J A (1998) Improving the delay stability of a two-way satellite time and frequency transfer earth station. In: Annual Precise Time and Time Interval Systems and Applications Meeting, December 1998, Reston, VA, USA.

Shemar, S L; Davis, J A (1999) A study of delay instabilities within a two-way satellite time and frequency transfer earth station. In: Proc. 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symp., 12-16 April 1999, Besancon, France.

Shemar, S L; Davis, J A; Whibberley, P B (2010) Preliminary results from NPL’s clock ensemble algorithm using hydrogen masers and caesium clocks. In: EFTF 2010 - 24th European Frequency and Time Forum, 13-16 April 2010, Noordwijk, Netherlands.

Silver, J M; Guo, C L; Den Bino, L; Del'Haye, P (2017) Kerr superoscillator model for microresonator frequency combs. Phys. Rev. A, 95 (3). 033835

Sinclair, A G; Wilson, M A; Gill, P (2001) Improved three-dimensional control of a single strontium ion in an endcap trap. Opt. Commun., 190. pp. 193-203.

Sinclair, A G; Wilson, M A; Letchumanan, V; Gill, P (2002) Resolved sideband cooling of a single trapped strontium ion. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

Slavik, R*; Marra, G; Fokoua, E N*; Baddela, N*; Wheeler, N V*; Petrovich, M*; Poletti, F*; Richardson, D J* (2015) Ultralow thermal signal phase and propagation delay sensitivity in hollow core optical fibers. Sci. Rep., 5. p. 15447.

Smith, A J; Woolliams, P D; Roddie, A G (1999) Optoelectronic time domain reflectometry. IEE Colloq. Dig., 0008. 6/1-6.

Szymaniec, K; Chalupczak, W; Henderson, D (2003) Initial evaluation of the NPL caesium fountain frequency standard. In: Proceedings of the 2003 IEEE International Frequency Control Symposium and PDS Exhibition (jointly with the 17th European Frequency and Time Forum), 3-9 May 2003, Tempa, Florida, USA.

Szymaniec, K; Chalupczak, W; Whibberley, P B; Lea, S N; Henderson, D (2005) Evaluation of the primary frequency standard NPL-CsF1. Metrologia, 42 (1). pp. 49-57.

Szymaniec, K; Chalupczak, W; Whibberley, P B; Lea, S N; Henderson, D (2006) Reply to the comment on 'Evaluation of the primary frequency standard NPL-CsF1'. Metrologia, 43 (3). L18-19

Szymaniec, K; Lea, S N; Gibble, K*; Park, S E*; Liu, K*; Glowacki, P* (2016) NPL Cs fountain frequency standards and the quest for the ultimate accuracy. J. Phys.: Conf. Ser., 723. 012003

Szymaniec, K; Lea, S N; Liu, K* (2014) An evaluation of the frequency shift caused by collisions with background gas in the primary frequency standard NPL-CsF2. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 61 (1). pp. 203-206.

Szymaniec, K; Noh, H R*; Park, S E*; Takamizawa, A* (2013) Spin polarization in a freely evolving sample of cold atoms. Appl. Phys. B, Laser Opt., 111 (3). pp. 527-535.

Szymaniec, K; Park, S E* (2011) Primary frequency standard NPL-CsF2: optimised operation near the collisional shift cancellation point. IEEE Trans. Instrum. Meas., 60 (7). pp. 2475-2481.

Szymaniec, K; Park, S E*; Marra, G; Chalupczak, W (2010) First accuracy evaluation of the NPL-CsF2 primary frequency standard. Metrologia, 47 (4). pp. 363-376.

T

Taheri, H*; Del'Haye, P; Eftekhar, A A*; Wiesenfeld, K*; Adibi, A* (2016) Self-synchronization and phase steps in microresonator-based optical frequency combs. In: 2016 Conference on Lasers and Electro-Opics (CLEO), 5-10 June 2016, San Jose, CA, USA.

Taheri, H*; Del'Haye, P; Eftekhar, A A*; Wiesenfeld, K*; Adibi, A* (2017) Self-synchronization phenomena in the Lugiato-Lefever equation. Phys. Rev. A, 96 (1). 013828

Tavella, P*; Sesia, I*; Cerretto, G*; Signorile, G*; Calonico, D*; Costa, R*; Clivati, C*; Cantoni, E*; De Stefano, C*; Frittelli, M*; Formichella, V*; Abadessa, A*; Cernigliaro, A*; Fiasca, F*; Perucca, A*; Mantero, S*; Widomski, T*; Kaczmarek, J*; Uzycki, J*; Borgulski, K*; Olbrysz, P*; Kowalski, J*; Cerabolini, P*; Rotiroti, L*; Biserni, E*; Zarroli, E*; Leone, V*; Veiga, M T*; Suarez, T*; Diaz, J*; Defraigne, P*; Ozdemir, N*; Blaire, Q*; Gandara, M*; Hamoniaux, V*; Varriale, E*; Morante, Q*; Dhiri, V*; Giulianini, E*; Mangiantini, M*; Wallin, A E*; Galleani, L*; Hindley, D (2016) The European project DEMETRA: demonstrating time dissemination services. In: 47th Annual Precise Time and Time Interval Systems and Applications Meeting, 25-28 January 2016, Monterey, CA, USA.

Tavella, P*; Sesia, I*; Cerretto, G*; Signorile, G*; Calonico, D*; Costa, R*; Clivati, C*; Cantoni, E*; De Stefano, C*; Frittelli, M*; Formichella, V*; Cerabolini, P*; Rotiroti, L*; Biserni, E*; Leone, V*; Zarroli, E*; Sormani, D*; Defraigne, P*; Ozdemir, N*; Baire, Q*; Gandara, M*; Hamoniaux, V*; Varriale, E*; Morante, Q*; Widonski, T*; Kacmarek, J*; Uzycki, J*; Borgulski, K*; Olbrysz, P*; Kowalski, J*; Beccari, M*; Cernigliaro, A*; Fiasca, F*; Perucca, A*; Mantero, S*; Dhiri, V*; Veiga, M T*; Suarez, T*; Diaz, J*; Mangiantini, M*; Wallin, A E*; Galleani, L*; Hindley, D (2016) Experimental time dissemination services based on European GNSS signals: the H2020 DEMETRA project. In: 2016 European Frequency and Time Forum (EFTF), 4-7 April 2016, York, UK.

Tavella, P*; Sesia, I*; Cerretto, G*; Signorile, G*; Calonico, D*; Costa, R*; Clivati, C*; Cantoni, E*; De Stefano, C*; Frittelli, M*; Formichella, V*; Cernigliaro, A*; Fiasca, F*; Perucca, A*; Mantero, S*; Cerabolini, P*; Rotiroti, L*; Biserni, E*; Leone, V*; Zarroli, E*; Sormani, D*; Dhiri, V*; Defraigne, P*; Ozdemir, N*; Baire, Q*; Veiga, M T*; Suarez, T*; Diaz, J*; Gandara, M*; Hamoniaux, V*; Mangiantini, M*; Varriale, E*; Morante, Q*; Wallin, A E*; Widonski, T*; Kaczmarek, J*; Uzycki, J*; Borgulski, K*; Olbrysz, P*; Kowalski, J*; Galleani, L*; Hindley, D (2016) The European project DEMETRA, timing services based on European GNSS: first experimental results. In: 2016 IEEE Metrology for Aerospace (MetroAeroSpace), 22-23 June 2016, Florence, Italy.

Taylor, P (1999) Stability limitations in optical frequency standards. NPL Report. CBTLM 1

Taylor, P; Roberts, M; Barwood, G P; Gill, P (1998) Combined optical infrared single ion frequency standard. Opt. Lett., 23 (4). pp. 298-300.

Taylor, P; Roberts, M; Barwood, G P; Gill, P (1998) Combined optical-infrared single ion frequency standard. In: Proc. 1998 CPEM Digest, July 1998, Washington, DC, USA.

Taylor, P; Roberts, M; Barwood, G P; Gill, P (1998) Combined optical-infrared single ion-frequency standard. In: CPEM '98 Conference on Precision Electromagnetic Measurements Conference Digest, 6-10 July 2003, Washington DC, USA.

Taylor, P; Roberts, M; Gateva-Kostova, S V*; Clarke, R B W*; Barwood, G P; Rowley, W R C; Gill, P (1997) Investigation of the 2S1/2-2D5/2 clock transition in a single ytterbium ion. Phys. Rev. A, 56. p. 2699.

Taylor, P; Roberts, M; Macfarlane, G M; Barwood, G P; Rowley, W R C; Gill, P (1999) Measurement of the infrared 2F7/2-2D5/2 transition in a single 171Yb+ ion. Phys. Rev. A, At. Mol. Opt. Phys., 60 (4). pp. 2829-2833.

Taylor, P; Webster, S A; Roberts, M; Rowley, W R C; Barwood, G P; Gill, P (2001) Progress towards a single ytterbium ion optical clock. Proc. SPIE - Int. Soc. Opt. Eng., 4269. pp. 155-169.

Tokunaga, S K*; Hendricks, R J; Tarbutt, M R*; Darquie, B* (2017) High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules. New J. Phys., 19. 053006

Tsatourian, V; Margolis, H S; Marra, G; Reid, D T*; Gill, P (2010) Common-path self-referencing interferometer for carrier-envelope offset frequency stabilization with enhanced noise immunity. Opt. Lett., 35 (8). pp. 1209-1211.

Tsatourian, V; Margolis, H S; Marra, G; Reid, D T*; Gill, P (2010) Noise-insensitive self-referencing interferometer for carrier-envelope offset frequency stabilization of a Ti:sapphire laser. In: Lasers and Electro-optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), 2010, 16-21 May 2010, Sam Jose, USA.

Tsatourian, V; Sergeyev, S V*; Mou, C B*; Rozhin, A*; Mikhailov, V*; Rabin, B*; Westbrook, P S*; Turitsyn, S K* (2013) Polarisation dynamics of vector soliton molecules in model locked fibre laser. Sci. Rep., 3. p. 3154.

W

Walton, B R; Hosaka, K; Lea, S N; Margolis, H S; Gill, P (2006) Optical frequency measurements using femtosecond combs. In: Optical Frequency Combs for Space International Workshop, 2-3 October 2006, NPL, UK.

Walton, B R; Margolis, H S; Tsatourian, V; Gill, P (2007) A transportable optical frequency comb based on a mode-locked fibre laser. In: OFMC 2007, 15-17 October 2007, NPL, UK.

Walton, B R; Margolis, H S; Tsatourian, V; Gill, P (2008) A transportable optical frequency comb based on a mode-locked fibre laser. IET Optoelectronics, 2 (5). pp. 182-187.

Webster, S A; Blythe, P E; Hosaka, K; Barwood, G P; Gill, P (2004) Systematics shifts of the 467 nm electric octupole transition in 171 Yb+. NPL Report. CBTLM 31

Webster, S A; Gill, P (2011) Force-insensitive optical cavity. Opt. Lett., 36 (18). pp. 3572-3574.

Webster, S A; Godun, R; King, S; Huang, G L; Walton, B; Tsatourian, V; Margolis, H S; Lea, S N; Gill, P (2010) Frequency measurement of the S-2(1/2)-D-2(3/2) electric quadrupole transition in a single Yb-171(+) ion. IEEE Trans. Ultrason. Feroelectr. Freq. Control, 57 (3). pp. 592-599.

Webster, S A; Oxborrow, M; Pugla, S; Millo, J*; Gill, P (2008) Thermal-noise-limited optical cavity. Phys. Rev. A, 77 (3). 033847

Webster, S A; Oxborrow, M; Pugla, S; Milo, J*; Gill, P (2008) Thermal-noise-limited optical cavity. Phys. Rev. A, 77 (3). 033847

Webster, S A; Taylor, P; Roberts, M; Barwood, G P; Blythe, P; Gill, P (2002) A frequency standard using the 2S1/2 - 2F5/2 octupole transition in 171Yb+. In: Proceedings of the 6th Symposium on Frequency Standards and Metrology, 9-14 September 2001, University of St Andrews, Fife, Scotland, UK.

Webster, S A; Taylor, P; Roberts, M; Barwood, G P; Gill, P (2002) Kilohertz resolution spectroscopy of the 2D1/2-2F7/2 electric octupole transition in a single 171Yb+ ion. Phys. Rev. A, At. Mol. Opt. Phys., 65 (5). 052501

Webster, S A; Taylor, P; Roberts, M; Barwood, G P; Gill, P (2002) Kilohertz resolution spectroscopy of the 2S1/2-1F7/2 electric octupole transition in a single 171Yb+ ion. Phys. Rev. A, At. Mol. Opt. Phys., 65 (5). 052501

Whibberley, P B; Davis, J; Shemar, S (2011) Local representations of UTC in national laboratories. Metrologia, 48 (4). S154-S164

Whibberley, P B; Henderson, D; Lea, S N (1999) Development of a caesium fountain primary frequency standard at the NPL. In: Proc. 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium, 13-16 April 1999, Besancon, France.

Whibberley, P B; Henderson, D; Lea, S N; Zucco, M* (1995) The Caesium Fountain: progress towards the new primary frequency standard at NPL. In: BEMC 95 7th British Electromagnetic Measurements Conference Digest, 6 - 9 November 1995, Malvern.

Williams, J M; Henderson, D; Patel, P; Behr, R*; Palafox, L* (2007) Achieving sub-100-ns switching of programmable Josephson Arrays. IEEE Trans. Instrum. Meas., 56 (2). pp. 651-654.

Wolf, P*; Borde, C J*; Clairon, A*; Duchayne, L*; Landragin, A*; Lemonde, P*; Santarelli, G*; Ertmer, W*; Rasel, E*; Cataliotti, F S*; Inguscio, M*; Tino, G M*; Gill, P; Klein, H A; Reynaud, S*; Salomon, C*; Peik, E*; Bertolami, O*; Gil, P*; Paramos, J*; Jentsch, C*; Johann, U*; Rathke, A*; Bouyer, P*; Cacciapuoti, L*; Izzo, D*; De Natale, P*; Christophe, B*; Touboul, P*; Turyshev, S G*; Anderson, J*; Tobar, M E*; Schmidt-Kaler, F*; Vigue, J*; Madej, A A*; Marmet, L*; Angonin, M C*; Delva, P*; Tourrenc, P*; Metris, G*; Muller, H*; Walsworth, R*; Lu, Z H*; Wang, L J*; Bongs, K*; Toncelli, A*; Tonelli, M*; Dittus, H*; Lammerzahl, C*; Galzerano, G*; Laporta, P*; Laskar, J*; Fienga, A*; Roques, F*; Sengstock, K* (2009) Quantum physics exploring gravity in the outer solar system: the SAGAS project. Exp. Astron., 23 (2). pp. 651-687.

Woolliams, P D; Smith, A J A; Roddie, A G (1999) Time domain reflectometry - an optoelectronic approach. In: BEMC 99 - 9th International Conference on Electromagnetic Measurement, November 1999, Brighton, UK.

Wright, P S (2007) Accurate spectral analysis of repetitive signals composed of components nonsynchronous with sampling clock. IEEE Trans. Instrum. Meas., 56 (2). pp. 655-659.

Wu, D S*; Slavik, R*; Marra, G; Richardson, D J* (2013) Direct selection and amplification of individual narrowly spaced optical comb modes via injection locking: design and characterization. J. Lightwave Technol., 31 (14). pp. 2287-2295.

Wu, D S*; Slavik, R*; Marra, G; Richardson, D J* (2012) Phase noise characterization of injection locked semiconductor lasers to a 250 MHz optical frequency comb.

Z

Zucco, M*; Dudle, G*; Webb, C*; Whibberley, P B; Lea, S N; Henderson, D (1997) Current progress with the NPL caesium fountain frequency standard. In: Proc. EFTF 97, European Frequency and Time Forum, 4 - 6 March 1997, Neuchatel, Switzerland.