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.
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|Publisher Web site:||http://dx.doi.org/10.1364/OE.24.002281|
|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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