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
光学薄膜 损伤阈值 有机污染 真空 大气 310.0310 Thin films 310.6870 Thin films, other properties 140.0140 Lasers and laser optics 140.3440 Laser-induced breakdown
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.