外文题目: Characteristics and Mechanism of Laser-induced Surface Damage Initiated by Metal Contaminants
作者: Shi, Shuang; Sun, Mingying; Shi, Shuaixu; Li, Zhaoyan; Zhang, Ya-nan; Liu, Zhigang
刊名: Proc.SPIE
来源图书: 2015 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: ADVANCED LASERS AND APPLICATIONS
年: 2015 卷: 9621
会议名称: International Conference on Optical Instruments and Technology - Advanced Lasers and Applications
英文关键词:
laser damage; contaminant; metal particle; incident and exit surface; damage morphology
FUSED-SILICA; PARTICLES; NM
英文摘要:
In high power laser facility, contaminants on optics surfaces reduce damage resistance of optical elements and then decrease their lifetime. By damage test experiments, laser damage induced by typical metal particles such as stainless steel 304 is studied. Optics samples with metal particles of different sizes on surfaces are prepared artificially based on the file and sieve. Damage test is implemented in air using a 1-on-1 mode. Results show that damage morphology and mechanism caused by particulate contamination on the incident and exit surfaces are quite different. Contaminants on the incident surface absorb laser energy and generate high temperature plasma during laser irradiation which can ablate optical surface. Metal particles melt and then the molten nano-particles redeposit around the initial particles. Central region of the damaged area bears the same outline as the initial particle because of the shielding effect. However, particles on the exit surface absorb a mass of energy, generate plasma and splash lots of smaller particles, only a few of them redeposit at the particle coverage area on the exit surface. Most of the laser energy is deposited at the interface of the metal particle and the sample surface, and thus damage size on the exit surface is larger than that on the incident surface. The areas covered by the metal particle are strongly damaged. And the damage sites are more serious than that on the incident surface. Besides, damage phenomenon also depends on coating and substrate materials.


文献类型: 会议论文
正文语种: English
收录类别: ISTP
DOI: 10.1117/12.2191639


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