Study of laser induced damage of high reflector at 1064 nm

Hongfei Jiao; Xinbin Cheng; Zhengxiang Shen; Bin Ma; Jinlong Zhang; Tao Ding; Pengfei He; Zhanshan Wang

doi:10.1117/12.867241

30 November 2010 Study of laser induced damage of high reflector at 1064 nm

Hongfei Jiao, Xinbin Cheng, Zhengxiang Shen, Bin Ma, Jinlong Zhang, Tao Ding, Pengfei He, Zhanshan Wang

Proceedings Volume 7842, Laser-Induced Damage in Optical Materials: 2010; 784205 (2010) https://doi.org/10.1117/12.867241
Event: Laser Damage Symposium XLII: Annual Symposium on Optical Materials for High Power Lasers, 2010, Boulder, Colorado, United States

Abstract

One TiO₂/SiO₂ high reflector with absorption of 300 ppm and two HfO₂/SiO₂ high reflectors with absorption of 40 and 4.5 ppm were fabricated using electron beam evaporation method. The influence of average absorption on laser induced damage threshold (LIDT) at 1064 nm of these coatings was studied using r-on-1 test mode. The LIDT of high absorbing TiO₂/SiO₂ coating is only 6.2 J/cm² at 3 ns, whereas, two weak absorbing HfO₂/SiO₂ high reflectors got almost the same LIDT that was over 100 J/cm² at 3 ns. Then a raster scan test method was employed to find the typical damage morphologies of these coatings with different absorption level. For TiO₂/SiO₂ high reflector with high average absorption, the representative damage morphologies are shallow pits that were probably caused by absorbing centers. However, for HfO₂/SiO₂ high reflectors with low average absorption, the dominant damage morphologies are micrometer-sized nodules ejected pits and the delamination initiating from the pits. The absorption of HfO₂/SiO₂ coatings is low enough to have minor influence on the laser induced damage.

Citation Download Citation

Hongfei Jiao, Xinbin Cheng, Zhengxiang Shen, Bin Ma, Jinlong Zhang, Tao Ding, Pengfei He, and Zhanshan Wang "Study of laser induced damage of high reflector at 1064 nm", Proc. SPIE 7842, Laser-Induced Damage in Optical Materials: 2010, 784205 (30 November 2010); https://doi.org/10.1117/12.867241

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