Characteristics and mechanism of laser-induced surface damage initiated by metal contaminants

Shuang Shi; Mingying Sun; Shuaixu Shi; Zhaoyan Li; Ya-nan Zhang; Zhigang Liu

doi:10.1117/12.2191639

5 August 2015 Characteristics and mechanism of laser-induced surface damage initiated by metal contaminants

Shuang Shi, Mingying Sun, Shuaixu Shi, Zhaoyan Li, Ya-nan Zhang, Zhigang Liu

Proceedings Volume 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications; 96210C (2015) https://doi.org/10.1117/12.2191639
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

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.

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Shuang Shi, Mingying Sun, Shuaixu Shi, Zhaoyan Li, Ya-nan Zhang, and Zhigang Liu "Characteristics and mechanism of laser-induced surface damage initiated by metal contaminants", Proc. SPIE 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications, 96210C (5 August 2015); https://doi.org/10.1117/12.2191639

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KEYWORDS

Particles

Metals

Laser induced damage

Laser energy

Glasses

Contamination

Laser irradiation

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