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Tunable cw UV laser with <35 kHz absolute frequency instability for precision spectroscopy of Sr Rydberg states.

Bridge, E. M. and Keegan, N. C. and Bounds, A. D. and Boddy, D. and Sadler, D. P. and Jones, M. P. A. (2016) 'Tunable cw UV laser with <35 kHz absolute frequency instability for precision spectroscopy of Sr Rydberg states.', Optics express., 24 (3). pp. 2281-2292.


We present a solid-state laser system that generates over 200 mW of continuous-wave, narrowband light, tunable from 316.3 nm – 317.7 nm and 318.0 nm – 319.3 nm. The laser is based on commercially available fiber amplifiers and optical frequency doubling technology, along with sum frequency generation in a periodically poled stoichiometric lithium tantalate crystal. The laser frequency is stabilized to an atomic-referenced high finesse optical transfer cavity. Using a GPS-referenced optical frequency comb we measure a long term frequency instability of < 35 kHz for timescales between 10−3 s and 103 s. As an application we perform spectroscopy of Sr Rydberg states from n = 37 – 81, demonstrating mode-hop-free scans of 24 GHz. In a cold atomic sample we measure Doppler-limited linewidths of 350 kHz.

Item Type:Article
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Publisher statement:Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
Date accepted:21 January 2016
Date deposited:23 March 2016
Date of first online publication:21 January 2016
Date first made open access:No date available

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