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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Dependences of Laser-Induced Bulk Damage Threshold and Crack Patterns in Several Nonlinear Crystals on Irradiation Direction
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Dependences of Laser-Induced Bulk Damage Threshold and Crack Patterns in Several Nonlinear Crystals on Irradiation Direction

机译：辐射方向上几种非线性晶体中激光诱导的整体损伤阈值和裂纹模式的相关性

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摘要

The dependence of the bulk damage threshold of nonlinear crystals, such as KDP, KTP, LBO, BBO, CLBO, LiNbO_3, and LiTaO_3 on laser irradiation direction and their polarization under a single-shot operation have been investigated. We found that the intrinsic bulk-damage threshold for nonlinear crystals was mainly caused by dielectric breakdown from self-focusing with nonlinear refractive index. LBO single crystals have the highest value studied among nonlinear crystals. For KDP, BBO, and CLBO crystals, the damage threshold when an incident laser was propagated along the < 001 > axis is approximately twofold that in the {100} or {010} plane at a 1.064μm wavelength. The damage crack pattern is also suggested to be in the mechanically weak direction due to inner pressure caused a laser-induced plasma in the crystal as a result of the laser breakdown due to electron avalanche breakdown.
机译：研究了非线性晶体如KDP，KTP，LBO，BBO，CLBO，LiNbO_3和LiTaO_3的整体损伤阈值对激光照射方向及其在单次操作下的偏振的依赖性。我们发现非线性晶体的本征体积损伤阈值主要是由具有非线性折射率的自聚焦引起的介电击穿引起的。在非线性晶体中，LBO单晶具有最高的研究价值。对于KDP，BBO和CLBO晶体，当入射激光沿<001>轴传播时，在1.064μm波长处，损伤阈值大约是{100}或{010}平面的两倍。由于由于电子雪崩击穿导致的激光击穿，晶体中的激光诱导的等离子体引起的内部压力也导致内部裂纹在机械弱方向上出现。

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