Long-pulse laser-induced damage in an optical anti-reflective film: II. Experimental research

作者：Li Changli^*; Ma Yao; Wang Di; Wang Zhiyang; Zhang Xihe; Liu Haiming

来源：Laser Physics, 2014, 24(12): 126003.

DOI：10.1088/1054-660X/24/12/126003

• laser-induced damage
• long-pulse flat-topped multi-Gaussian laser
• optical antireflection film
• thermal fusion damage

In order to verify the result of theoretical analysis about long-pulse flat-topped multi-Gaussian laser-induced damage in an optical anti-reflection film with HfO2/SiO2 composite film coating on a BK7 substrate (BK7:HfO2/SiO2), an experimental system was built, which carried out the experiment and analysis, focusing on the pulse-length 1.0 ms, flat-topped laser-induced damage. The result shows that the thermal effect is the main reason for damage under the long-pulse flat-topped laser. Moreover, the stripping and shedding occur because of the heating stress of the film happening at an early stage of the laser irradiation. However, the crack happens at laser irradiation termination. The correctness of the theoretical analysis results is verified.

• 出版日期2014-12
• 单位长春理工大学