Investigation of the high repetition rate picosecond laser induced damage properties of dielectric reflective optical coatings

Mingxiao Zhang; Zhongwen Lu; Yunti Pu; Liang Lv; Zhao Qiao; Ping Ma

doi:10.1117/12.2539915

8 July 2019 Investigation of the high repetition rate picosecond laser induced damage properties of dielectric reflective optical coatings

Mingxiao Zhang, Zhongwen Lu, Yunti Pu, Liang Lv, Zhao Qiao, Ping Ma

Author Affiliations +

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110630Z (2019) https://doi.org/10.1117/12.2539915
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

High repetition rate picosecond laser induced damage properties of Ta₂O₅/SiO₂ dielectric reflective optical coatings were investigated. The laser induced damage was attributed to the increase of the free electron density and temperature enhancement during the irradiation of high repetition rate picosecond laser. The correlation of laser induced damage threshold with pulse numbers was researched. At higher repetition rate, the laser induced damage threshold was reduced more with the increasing of pulsed number. We found that the defects absorption played an important role to the laser induced damage properties of dielectric reflective optical coatings. The damage morphology showed that the evolution of damage site was significantly influenced by the accumulation of laser energy. In order to enhance the resistance capacity, the dielectric reflective optical coatings were annealed with temperature of 260°C. The defect absorption was reduced after the annealing process. For the annealed coating, the laser induced damage threshold under high repetition rate picosecond laser was enhanced as a result of the suppression of defects in the coating.

Citation Download Citation

Mingxiao Zhang, Zhongwen Lu, Yunti Pu, Liang Lv, Zhao Qiao, and Ping Ma "Investigation of the high repetition rate picosecond laser induced damage properties of dielectric reflective optical coatings", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110630Z (8 July 2019); https://doi.org/10.1117/12.2539915

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