抄録
We investigated the ultraviolet laser-induced degradation of a nonlinear optical crystal CsLiB6O10
(CLBO). High-repetition-rate 266 nm pulses induced degradation of CLBO at a lower peak power
density than the bulk laser-induced damage threshold. This research reveals that the degradation is
caused by light-induced refractive index change observed as light-induced lensing effect in LiNbO3. We
experimentally estimated the threshold intensity of this degradation. Al-doped CLBO samples have
about two times higher threshold (40-50 MW/cm2) than conventional undoped samples (20-30
MW/cm2). We have established growth conditions to obtain high-quality CLBO crystals with lower
light scattering. This high-quality crystal can effectively slow down the degradation.
