Picosecond high-power 355-nm UV generation in CsLiB₆O₁₀ crystal.

We report third-harmonic generation (THG) at 355 nm in CsLiB6O10 (CLBO) by using sum-frequency mixing process. As a fundamental laser source, we employ a hybrid master oscillator power amplifier (MOPA) system seeded by a gain-switched laser diode (GS-LD) at 1064 nm to produce narrow spectral picosecond pulses. Both CLBO and walk-off compensated prism-coupled CLBO device generate over 30-W output of 355-nm UV lights, which means walk-off effect in CLBO is negligible in the picosecond laser system. The maximum THG conversion efficiency from the fundamental reaches about 48%, which is 1.2 times higher than that of LiB3O5 (LBO). Theoretical THG outputs with CLBO and LBO are numerically calculated in order to verify the validity of these experimental results in detail. (C) 2016 Optical Society of America