Laser damage metrology in biaxial nonlinear crystals using different test beams

A. Hildenbrand, F. Wagner, H. Akhouayri, J. Natoli, M. Commandré
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引用次数: 4

Abstract

Laser damage measurements in nonlinear optical crystals, in particular in biaxial crystals, may be influenced by several effects proper to these materials or greatly enhanced in these materials. Before discussion of these effects, we address the topic of error bar determination for probability measurements. Error bars for the damage probabilities are important because nonlinear crystals are often small and expensive, thus only few sites are used for a single damage probability measurement. We present the mathematical basics and a flow diagram for the numerical calculation of error bars for probability measurements that correspond to a chosen confidence level. Effects that possibly modify the maximum intensity in a biaxial nonlinear crystal are: focusing aberration, walk-off and self-focusing. Depending on focusing conditions, propagation direction, polarization of the light and the position of the focus point in the crystal, strong aberrations may change the beam profile and drastically decrease the maximum intensity in the crystal. A correction factor for this effect is proposed, but quantitative corrections are not possible without taking into account the experimental beam profile after the focusing lens. The characteristics of walk-off and self-focusing have quickly been reviewed for the sake of completeness of this article. Finally, parasitic second harmonic generation may influence the laser damage behavior of crystals. The important point for laser damage measurements is that the amount of externally observed SHG after the crystal does not correspond to the maximum amount of second harmonic light inside the crystal.
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用不同光束测量双轴非线性晶体激光损伤
非线性光学晶体,特别是双轴晶体中的激光损伤测量,可能受到这些材料固有的几种效应的影响或在这些材料中大大增强。在讨论这些影响之前,我们先讨论概率测量的误差条确定问题。由于非线性晶体通常体积小且价格昂贵,因此只有很少的位置用于单个损伤概率测量,因此损伤概率的误差条很重要。我们提出了数学基础和一个流程图,用于对应于所选置信水平的概率测量误差条的数值计算。可能改变双轴非线性晶体最大强度的影响有:聚焦像差、漂移和自聚焦。根据聚焦条件、光的传播方向、光的偏振和焦点在晶体中的位置,强像差会改变光束的轮廓,并大大降低晶体中的最大强度。对这种效应提出了一个校正因子,但如果不考虑聚焦透镜后的实验光束轮廓,则不可能进行定量校正。为了保证本文的完整性,本文迅速地回顾了离场和自聚焦的特点。最后,寄生二次谐波的产生可能影响晶体的激光损伤行为。激光损伤测量的重点是,晶体后外部观察到的SHG量并不对应于晶体内部的最大二次谐波光量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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