Abstract
We report a 10 kHz, 10.5 W deep ultraviolet (DUV) laser at 258 nm with a pulse duration of 3 ns by fourth-harmonic generation (FHG) in a crystal with high-conversion efficiency. The fundamental laser is at 1030 nm with 35 W output power consisting of a Yb:YAG ceramics thin rod amplifier. The of the DUV laser was confirmed to be . To the best of our knowledge, this is the best beam quality for DUV laser power higher than 10 W generated by FHG of a solid-state laser, as well as the highest conversion efficiency of 31% from infrared to DUV so far.
© 2017 Optical Society of America
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