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Proceedings Paper

Coupling effect of multi-wavelength lasers in damage performance of multilayer mirrors at 355 nm and 1064 nm
Author(s): Lei Yan; Chaoyang Wei; Dawei Li; Guohang Hu; Zhengxiu Fan
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Paper Abstract

Coupling effect between 355 nm laser and 1064 nm laser in damage initiation and morphology formation are investigated on two different coatings prepared with Hf/SiO2 and HfO2/SiO2 respectively. It was found that materials had little influence on the couple effect. When extra 1064 nm pulse energy is low, 355 nm laser induced damage thresholds of both coatings increase because of laser conditioning and then when 1064 nm pulse energy is high enough, 355 nm LIDTs decreased. Damage morphologies are also studied to explore the damage mechanism at respective wavelength. For the entirely different electric field distribution, 355 nm laser induced damages are mainly from nanometer-sized absorbers at upper interfaces while initiators for 1064 nm laser locate at substrate-coating interface or substrate subsurface. Under simultaneous illumination, the sensitive defects are still the precursors, but the damages are more catastrophic compared with damages induced by 355 nm laser only and they also show representative damage characteristics induced by single laser, namely 355 nm laser induced small pits and 1064 nm laser induced large delamination. Further studies also show that delamination area grows with the increase of pit numbers induced by 355 nm laser at fixed 1064 nm laser fluence. A possible mechanism was proposed to interpret observed delamination area growth phenomenon.

Paper Details

Date Published: 12 January 2012
PDF: 11 pages
Proc. SPIE 8206, Pacific Rim Laser Damage 2011: Optical Materials for High Power Lasers, 82060I (12 January 2012); doi: 10.1117/12.910498
Show Author Affiliations
Lei Yan, Shanghai Institute of Optics and Fine Mechanics (China)
Graduate School of Chinese Academy of Science (China)
Chaoyang Wei, Shanghai Institute of Optics and Fine Mechanics (China)
Dawei Li, Shanghai Institute of Optics and Fine Mechanics (China)
Guohang Hu, Shanghai Institute of Optics and Fine Mechanics (China)
Zhengxiu Fan, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8206:
Pacific Rim Laser Damage 2011: Optical Materials for High Power Lasers
Jianda Shao, Editor(s)

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