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

Hao Ma; Yuanan Zhao; Yuchen Shao; Cheng Li; Jian Sun; Jianda Shao

doi:10.1117/12.2539749

8 July 2019 The fatigue effect of femtosecond laser-induced damage in high-reflective coatings at low repetition rate

Hao Ma, Yuanan Zhao, Yuchen Shao, Cheng Li, Jian Sun, Jianda Shao

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 1106303 (2019) https://doi.org/10.1117/12.2539749
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

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.

Citation Download Citation

Hao Ma, Yuanan Zhao, Yuchen Shao, Cheng Li, Jian Sun, and Jianda Shao "The fatigue effect of femtosecond laser-induced damage in high-reflective coatings at low repetition rate", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 1106303 (8 July 2019); https://doi.org/10.1117/12.2539749

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