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Proceedings Paper

The fatigue effect of femtosecond laser-induced damage in high-reflective coatings at low repetition rate
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Paper Abstract

This work is dedicated to the study of fatigue effects upon femtosecond laser-induced damage of Ta2O5/HfO2/SiO2 highreflective coatings irradiated by pulse train at 1Hz (65 fs, 800 nm). Upon on comparative measurements of different pulse numbers involving between 10 and 300 pulses, laser-induced damage threshold (LIDT) decreases and the multipulse LIDT decreased to the level of 70~75% of the single pulse LIDT. In addition, we found that the probability of damage performs an increasing trend with the number of pulse increases when the coating is irradiated with the same fluence. The evolution of LIDT and 100% damage probability threshold under multipulse irradiations revealed that fatigue effects were affected by both laser fluence and shot numbers. The deep defects play an important role in the multi-shot mode. A correlative theory model based on critical conduction band electron density is constructed to elucidate the experimental phenomena.

Paper Details

Date Published: 8 July 2019
PDF: 9 pages
Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 1106303 (8 July 2019); doi: 10.1117/12.2539749
Show Author Affiliations
Hao Ma, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)
Yuanan Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)
Yuchen Shao, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)
Cheng Li, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)
Jian Sun, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)


Published in SPIE Proceedings Vol. 11063:
Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

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