Damage characteristic improvement of high reflectors by SiO2 overlayer

被引：2

作者：

Liu X. ^{[1
]}

Li X. ^{[1
]}

Zhao Y. ^{[1
]}

Li D. ^{[1
]}

Shao J. ^{[1
]}

Fan Z. ^{[1
]}

机构：

[1] Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800

来源：

Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | 2010年 / 22卷 / 12期

关键词：

Damage morphology; Delamination; Fundamental frequency high reflectors; Overlayers; Pits; Plasma ablation;

D O I：

10.3788/HPLPB20102212.2860

中图分类号：

学科分类号：

摘要：

In order to study the damage mechanism of high reflectors in high power laser systems, laser damage experiments are carried out on fundamental frequency high reflectors which are widely used in high power laser systems, and then the typical morphologies are compared and analyzed by means of step profiler, scanning electron microscope and surface profiler. The results show that the laser resistance is enhanced because of the SiO2 overlayer; typical damage morphology of the sample without silica overlayer is delamination, which is related to the thermal characteristics of materials, and delamination grows quickly during the subsequent laser irradiation; typical damage morphology of the sample with silica overlayer is plasma ablation with a pit in its center, which is related to the thermal mechanics of defects sputtering. The bulge around pits is the macroscopical manifestation of this mechanics effect and plasma ablation with a pit is relatively stable during the subsequent laser irradiation comparing to delamination. The addition of SiO2 overlayer restrains the occurrence of delamination and improves the damage characteristic of the samples.

引用

页码：2860 / 2864

页数：4

共 17 条

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