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. 2019 Mar 1;58(7):1657-1661.
doi: 10.1364/AO.58.001657.

Highly coherent, watt-level deep-UV radiation via a frequency-quadrupled Yb-fiber laser system

Z Burkley, A D Brandt, C Rasor, S F Cooper, D C Yost

Highly coherent, watt-level deep-UV radiation via a frequency-quadrupled Yb-fiber laser system

Z Burkley et al. Appl Opt. .

Abstract

We demonstrate a 1.4 W continuous-wave (CW) laser at 243.1 nm. The radiation is generated through frequency quadrupling the output of a ytterbium-doped fiber amplifier system. which produces >10 W of CW power at 972.5 nm. We demonstrate absolute frequency control by locking the laser to an optical frequency comb and exciting the 1S-2S transition in atomic hydrogen. This frequency-stabilized, high-power deep-UV laser is of significant interest for precision spectroscopy of simple and exotic atoms, two-photon laser cooling of hydrogen, and Raman spectroscopy.

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