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.

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; Margolis, H S; Barwood, G P; Lea, S N; Gill, P; Huang, G; Rowley, W R C (2004) Absolute frequency measurement of a 1.5µm acetylene standard by use of a combined frequency chain and femtosecond comb. Opt. Lett., 29 (6). pp. 566-568.

Edwards, C S; Margolis, H S; Barwood, G P; Lea, S N; Gill, P; Huang, G; Rowley, W R C (2004) Absolute frequency measurements of 1.5 micron acetylene-stabilized lasers. In: Conference on Precision Electromagnetic Measurements (CPEM) 2004, 27 June - 2 July 2004, London, UK.

Edwards, C S; Margolis, H S; Barwood, G P; Gill, P; Rowley, W R C (2004) Frequency measurements of 778nm rubidium two photon diode laser diodes. In: Conference on Precision Electromagnetic Measurements (CPEM) 2004, 27 June - 2 July 2004, London, UK.

Webster, S A; Hosaka, K; Blythe, P J; Margolis, H S; Lea, S N; Huang, G; Rowley, W R C; Gill, P (2003) Femtosecond comb measurements of the 467 nm electric octupole transition in 171Yb+. NPL Report. CBTLM 28

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

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.

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

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.

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.

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.

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.

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)

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.

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.

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.

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.

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.

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.

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; 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.

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.

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.

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.

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.

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.

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.

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 (1995) Absolute frequency stabilisation of a 637nm laser diode using Doppler-free I2 spectra. Electron. Lett., 31 (10). pp. 796-797.

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

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 (1994) Laser cooling and probing of a trapped strontium ion using all-solid-state lasers. AIP Conf. Proc., 290. pp. 35-37.

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.

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.

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; Gill, P; Rowley, W R C (1993) Laser diodes for length determination using swept-frequency interferometry. Meas. Sci. Technol., 4 (9). pp. 988-994.

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; Gill, P; Rowley, W R C (1993) Optically narrowed Rb-stabilised GaAlAs diode laser frequency standards with 1.5x10-10 absolute accuracy. Proc. SPIE - Int. Soc. Opt. Eng., 1837. pp. 262-270.

Downs, M J; Rowley, W R C (1993) A proposed design for a polarization-insensitive optical interferometer system with subnanometric capability. Precision Engineering, 15 (4). pp. 281-286.

Rowley, W R C (1992) Rapport au Comit‚ International des Poids et Mesures. Technical Report.