Impurity and Defect Control of Nonlinear Optical Crystal CsLiB6O10 for Improving Ultraviolet Laser-Induced Damage Tolerance

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  • 不純物・欠陥制御を用いた非線形光学結晶 CsLiB6O10の紫外レーザー損傷耐性向上
  • Laser Original 不純物・欠陥制御を用いた非線形光学結晶CsLiB₆O₁₀の紫外レーザー損傷耐性向上
  • Laser Original フジュンブツ ・ ケッカン セイギョ オ モチイタ ヒセンケイ コウガク ケッショウ CsLiB ₆ O ₁ ₀ ノ シガイ レーザー ソンショウ タイセイ コウジョウ

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Abstract

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.

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