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arXiv 0709.0062physics.optics
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Laser各向异性对单晶体的损伤

Anisotropy of Laser-Induced Bulk Damage of Single Crystals

O. Krupych, Ya. Dyachok, I. Smaga, R. Vlokh

摘要:

实验研究了LiNbO_3和KDP电介质单晶的激光损伤特性。结果表明,介质晶体中激光损伤的形状取决于晶体的弹性对称性和激光束的传播方向。当光束沿晶体光轴传播时,LiNbO_3晶体的激光损伤图形为六光路星,KDP晶体的激光损伤图形为四光路星。在KDP晶体中,平行于X轴和Y轴方向的损伤初始为十字形,在损伤演化过程中,Z向裂纹进一步分裂为两条裂纹,导致由正交型损伤向六角型损伤转变。

英文摘要:

The regularities of laser-induced damage of anisotropic materials, such as LiNbO3 and KDP dielectric single crystals, are experimentally studied. It is revealed that the shape of laser-induced damage in the dielectric crystals depends on the elastic symmetry of crystal and the propagation direction of the laser beam. When the beam propagates along the optic axis of crystals, the figures of the laser damage are six-path stars for LiNbO3 and four-path ones for KDP crystals. For the direction parallel to X and Y axes in KDP crystal, the damage has initially cross-like configuration, with further splitting of Z-oriented crack into two cracks in the process of damage evolution, leading to transformation of orthogonal-type damage to a hexagonal-type one.

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