Mitigation of laser induced damage on dielectric mirrors in a robust way

Li Zhou; Youen Jiang; Simin Zhang; Hui Wei; Wei Fan; Xuechun Li

doi:10.1117/12.2540919

8 July 2019 Mitigation of laser induced damage on dielectric mirrors in a robust way

Li Zhou, Youen Jiang, Simin Zhang, Hui Wei, Wei Fan, Xuechun Li

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 1106311 (2019) https://doi.org/10.1117/12.2540919
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

Laser induced damage on dielectric mirrors and its rapid growth with successive shots have been and continue to be an important barrier to high power laser systems. Here the morphology of mitigation pit is optimized theoretically, and an ultrashort laser is utilized to totally remove damage on both high-reflective (HR) and anti-reflective (AR) coating. At the same time, the substrate is handled carefully and free of laser ablation, which lower the scattering loss and the amount of debris during laser machining process. Then, using R-on-1 test procedure, several mitigated sites with size of 1mm× 1mm are investigated by a Nd:YAG laser system with a flat-top spatial distribution of fully covering the mitigated site. The experimental results show even at the average fluence of 18J/cm²@6ns, there’s no damage initiation on AR coatings and no damage growth on HR coatings. It demonstrates that ultrashort laser machining is an effective and robust way to mitigate laser damage and a promising way to improve dielectric mirror performance of high power laser system in volume production.

Citation Download Citation

Li Zhou, Youen Jiang, Simin Zhang, Hui Wei, Wei Fan, and Xuechun Li "Mitigation of laser induced damage on dielectric mirrors in a robust way", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 1106311 (8 July 2019); https://doi.org/10.1117/12.2540919

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KEYWORDS

Dielectric mirrors

Laser induced damage

Coating

Resistance

Laser systems engineering

Antireflective coatings

Laser ablation

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