We demonstrate a high-power narrow-linewidth ultraviolet (UV) laser system at 318.6 nm for direct ( to 100) Rydberg excitation of cesium atoms. Based on commercial fiber lasers and efficient nonlinear frequency conversion technology, 2.26 W of tunable UV laser power is obtained from cavity-enhanced second-harmonic generation following sum-frequency generation of two infrared lasers at 1560.5 and 1076.9 to 637.2 nm. The maximum doubling efficiency is 57.3%. The typical UV laser power root-mean-square fluctuation is less than 0.87% over 30 min, and the continuously tunable range of the UV laser frequency is more than 6 GHz. Its beam quality factors and are 1.16 and 1.48, respectively. This high-performance UV laser has significant potential use in quantum optics and cold atom physics.
© 2016 Optical Society of AmericaFull Article | PDF Article
12 September 2016: A correction was made to Ref. 14.
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