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Compact laser system for a laser-cooled ytterbium ion microwave frequency standard

Mulholland, S.; Klein, H. A.; Barwood, G. P.; Donnellan, S.; Nisbet-Jones, P. B. R.; Huang, G.; Walsh, G.; Baird, P. E. G.; Gill, P. (2019) Compact laser system for a laser-cooled ytterbium ion microwave frequency standard. Review of Scientific Instruments, 90 (3). 033105 ISSN 0034-6748

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The development of a transportable microwave frequency standard based on the ground-state transition of 171Yb+ at ~12.6 GHz requires a compact laser system for cooling the ions, clearing out of long-lived states and also for photoionisation. In this paper, we describe the development of a suitable compact laser system based on a 6U height rack-mounted arrangement with overall dimensions 260 × 194 × 335 mm. Laser outputs at 369 nm (for cooling), 399 nm (photoionisation), 935 nm (repumping), and 760 nm (state clearout) are combined in a fiber arrangement for delivery to our linear ion trap and we demonstrate this system by cooling of 171Yb+ ions. Additionally, we demonstrate that the lasers at 935 nm and 760 nm are close in frequency to water vapor and oxygen absorption lines, respectively; specifically, at 760 nm, we show that one 171Yb+ transition is within the pressure broadened profile of an oxygen line. These molecular transitions form convenient wavelength references for the stabilization of lasers for a 171Yb+ frequency standard.

Item Type: Article
Subjects: Time and Frequency > Microwave Frequency Standards
Divisions: Quantum Science
Identification number/DOI: 10.1063/1.5082703
Last Modified: 28 May 2019 12:46
URI: http://eprintspublications.npl.co.uk/id/eprint/8404

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