MW Peak Power UV laser by Fourth Harmonic Generation in YAl3(BO3)4 crystal

Abstract

Introduction In 2008, YAl3(BO3)4 (YAB) was reported as new non-hygroscopic material with good deff (0.63 pm/V) and small walk-off (1.9°) which can be a good alternative to the two commercial crystals: the hygroscopic CsLiB6O10 (CLBO) or to the β-BaB2O4 (BBO; which presents large walk-off) for UV generation at 266 nm [1]. However, until now the UV peak power obtained with YAB was only limited to the kW range [2]. In this work, we demonstrate 1.6 MW peak power at 266 nm using YAB as nonlinear crystal.