Abstract

Damage precursors in the $3\omega$ (351 nm) mirror for a high-power laser system are investigated as well as the relevant damage mechanisms. The precursors are classified into two ensembles according to the different laser resistance and damage features. The former is nano-absorbing precursors, which are sensitive to the standing wave electric field and vulnerable to the laser irradiation. The latter is submicrometer nodular defects, which have higher laser resistance and are sensitive to the adhesion strength between the fluoride coatings and oxide coatings. The damage due to nano-absorbing precursors is efficiently suppressed with the double stack design that screens the electric field in the oxides. Currently, the nodular seed is major originating from the ${\mathrm{Al}}_2{\mathrm{O}}_3/{\mathrm{SiO}}_2$ stack. Even for the same defect type and mirror, the final damage features are dependent on the local mechanical properties at the irradiation location. The investigations of the damage mechanisms provide a direction to further improve the laser-induced damage threshold of the $3\omega$ mirror.

© 2016 Optical Society of America

Improving laser damage resistance of 355  nm high-reflective coatings by co-evaporated interfaces

Huanbin Xing, Meiping Zhu, Yingjie Chai, Kui Yi, Jian Sun, Yun Cui, and Jianda Shao
Opt. Lett. 41(6) 1253-1256 (2016)

Laser damage dependence on the size and concentration of precursor defects in KDP crystals: view through differently sized filter pores

Yueliang Wang, Yuanan Zhao, Xiaoyi Xie, Guohang Hu, Liujiang Yang, Ziyuan Xu, and Jianda Shao
Opt. Lett. 41(7) 1534-1537 (2016)

Femtosecond damage resistance of femtosecond multilayer and hybrid mirrors

Viktória Csajbók, Lőrinc Szikszai, Benedek J. Nagy, and Péter Dombi
Opt. Lett. 41(15) 3527-3530 (2016)

Investigation on nano-absorbing precursors in the picosecond regime via the comparative study of HfO₂/SiO₂ and Ta₂O₅/SiO₂ high-reflectivity coating damage

He Gong, Xiaofeng Liu, Chunxian Tao, Yuan’an Zhao, Kun Shuai, Dawei Li, Weili Zhang, Jian Sun, Li Zhou, You’en Jiang, Yun Cui, Dawei Zhang, Yaping Dai, and Jianda Shao
Opt. Mater. Express 13(6) 1820-1835 (2023)

Laser damage growth with picosecond pulses

Martin Sozet, Jérôme Neauport, Eric Lavastre, Nadja Roquin, Laurent Gallais, and Laurent Lamaignère
Opt. Lett. 41(10) 2342-2345 (2016)