13 November 2017 Characterization of laser induced damage of HR coatings with picosecond pulses
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The effect of protective layer on the picosecond laser-induced damage behaviors of HfO2/SiO2 high-reflective (HR) coatings are explored. Two kinds of 1064nm HR coatings with and without protective layer are deposited by electron beam evaporation. Laser-induced damage tests are conducted with 1064nm, 30ps S-polarized and P-polarized pulses with different angle of incidence (AOI) to make the electric fields intensity in the HR coatings discrepantly. Damage morphology and cross section of damage sites were characterized by scanning electron microscope (SEM) and focused ion beam (FIB), respectively. It is found that SiO2 protective layer have a certain degree of improvement on laser induced damage threshold (LIDT) for every AOIs. The onset damage initiated very near to the Max peak of e-field, after which forms ripple-like pits. The damage morphology presents as layer delamination at high fluence. The Laser damage resistance is correspond with the maximum E-intensity in the coating stacks.
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Cheng Li, Cheng Li, Yuan'an Zhao, Yuan'an Zhao, Yun Cui, Yun Cui, Yueliang Wang, Yueliang Wang, Xiaocong Peng, Xiaocong Peng, Chong Shan, Chong Shan, Meiping Zhu, Meiping Zhu, Jianguo Wang, Jianguo Wang, Jianda Shao, Jianda Shao, } "Characterization of laser induced damage of HR coatings with picosecond pulses", Proc. SPIE 10447, Laser-Induced Damage in Optical Materials 2017, 104470Z (13 November 2017); doi: 10.1117/12.2280539; https://doi.org/10.1117/12.2280539

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