Chinese Optics Letters, Vol. 5, Issue 11, 11680 (2007)
Impact of organic contamination in vacuum on laser-induced damage threshold of TiO2/SiO2 dielectric mirrors
Yun Cui1,2,*, Hua Yu1,2, Yuanan Zhao1,2, Yunxia Jin1,2, Hongbo He1, and Jianda Shao1
- 1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
- 2Graduate School of the Chinese Academy of Sciences, Beijing 100039
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.
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