Chinese Optics Letters, 2007, 5 (11): 11680, Published Online: Nov. 14, 2007   

Impact of organic contamination in vacuum on laser-induced damage threshold of TiO2/SiO2 dielectric mirrors Download: 688次

Author Affiliations
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2 Graduate School of the Chinese Academy of Sciences, Beijing 100039
Abstract
The influence of organic contamination in vacuum on the laser-induced damage threshold (LIDT) of coatings is studied. TiO2/SiO2 dielectric mirrors with high reflection at 1064 nm are deposited by the electronbeam evaporation method and their LIDTs are measured in vacuum and atmosphere, respectively. It is found that the contamination in vacuum is easily attracted to optical surfaces because of the low pressure and becomes the source of damage, O2 molecules in vacuum with contamination can accelerate the laser-induced damage by observing LIDT and damage morphologies. LIDTs of mirrors have a little change in vacuum compared with in atmosphere when the organic contamination is wiped off. The results indicate that organic contamination is a significant reason to decrease the LIDT in vacuum.

Yun Cui, Hua Yu, Yuanan Zhao, Yunxia Jin, Hongbo He, Jianda Shao. Impact of organic contamination in vacuum on laser-induced damage threshold of TiO2/SiO2 dielectric mirrors[J]. Chinese Optics Letters, 2007, 5(11): 11680.

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