Method and system for predicting surface laser damage performance of optical element

Abstract

The invention relates to a method and a system for predicting surface laser damage performance of an optical element. The method comprises the steps of: selecting a standard optical element; acquiringabsorptive defect distribution characteristics of the standard optical element to obtain defect densities of different absorption levels; acquiring damage performance, wherein the damage performancecomprises damage thresholds and damage densities; determining the defect density with the highest correlation with the damage performance in the defect densities of different absorption levels of thestandard optical element by adopting a Spearman correlation analysis method, so as to obtain the defect density corresponding to each damage performance, and establishing a correlation curve between the damage performance and the corresponding defect density to serve as a standard curve; and acquiring the defect density of a to-be-detected optical element, and determining the damage performance ofthe to-be-detected optical element according to the standard curve. According to the method and the system for predicting the surface laser damage performance of the optical element, the evaluation precision of the damage performance of the optical element can be improved without damaging the optical element.

Description

technical field [0001] The invention relates to the technical field of laser damage assessment on the surface of optical components, in particular to a method and system for predicting the performance of laser damage on the surface of optical components. Background technique [0002] A large number of high-performance optical components are used in large-scale high-power laser devices, such as fused silica, K9, UBK7, silicon wafers, and KDP crystals. With the continuous improvement of the output energy of laser devices, the problem of laser damage of optical components has become increasingly prominent , has become an important bottleneck limiting the continuous improvement of laser output energy. [0003] At present, the actual laser damage performance of most optical components is far lower than its theoretical value, indicating that the residual surface defects after optical components are processed are an important cause of laser damage. The general process of laser dam...

AI Technical Summary

Problems solved by technology

The quality of optical components used under high-power laser conditions is very high, and the surface residual absorption is mostly on the order of ppm. With such a low absorption level, traditional grating-based spectrometer-based transmittance spectra cannot obtain reliable data.

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