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Proceedings Paper

Comparison of 355-nm nanosecond and 1064-nm picosecond laser induced damage in high-reflective coatings
Author(s): Cheng Li; Yuan'an Zhao; Yun Cui; Xiaocong Peng; Chong Shan; Meiping Zhu; Jianguo Wang; Jianda Shao
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Paper Abstract

Laser-induced damage in optical components has always been a key challenge in the development of high-power laser systems. In picosecond regime, the laser-matter interactions are quite complex and the damage mechanism is not yet understood. Therefore, it is necessary to investigate the laser induced damage of optical components in picosecond regime. Our previous study on the laser induced damage in HfO2/SiO2 high-reflective (HR) coatings in 30-ps laser pulses reported the damage morphologies to be high-density micrometer-scale pits, which are similar to the morphologies of HR coatings irradiated by 355-nm pulses in nanosecond regime. Thus, it makes sense to analyze the damage mechanism of HR coatings in picosecond regime by comparing the damage results with those tested with 355-nm pulses. In this study, laser induced damage of HfO2/SiO2 HR coatings are performed by 355-nm, 7-ns pulses and 1064-nm, 30-ps pulses, respectively. Different angles of incidence (AOIs) are operated in the tests, in order to modulate the electric field (E-intensity) distributions in the coating stacks. Damage morphologies and cross-sectional profiles are characterized using scanning electron microscope (SEM) and focused ion beam (FIB), respectively. The laser-induced damage thresholds (LIDTs) and morphologies tested with two different laser pulses are compared. The damage locations are compared with corresponding E-field distributions and the damage reasons are discussed.

Paper Details

Date Published: 16 May 2018
PDF: 9 pages
Proc. SPIE 10713, Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers, 1071306 (16 May 2018); doi: 10.1117/12.2317804
Show Author Affiliations
Cheng Li, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Yuan'an Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Changchun Institute of Optics, Fine Mechanics and Physics (China)
Yun Cui, Shanghai Institute of Optics and Fine Mechanics (China)
Xiaocong Peng, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Chong Shan, Shanghai Institute of Optics and Fine Mechanics (China)
Changchun Univ. of Science and Technology (China)
Meiping Zhu, Shanghai Institute of Optics and Fine Mechanics (China)
Jianguo Wang, Shanghai Institute of Optics and Fine Mechanics (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 10713:
Pacific-Rim Laser Damage 2018: Optical Materials for High-Power Lasers
Takahisa Jitsuno; Jianda Shao; Wolfgang Rudolph, Editor(s)

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