Ta2O5／SiO2硬膜双腔滤光片激光损伤特性研究

研究了Ta2O5／SiO2硬膜双腔干涉滤光片带内、带边及带外的吸收和激光损伤特性。实验发现，对于作用激光，带通滤光片的驻波场分布、吸收率和损伤阈值在带内、带边和带外的响应特性对作用激光波长均呈现出明显的选择性。根据实验结果，结合滤光片的驻波场分析，给出了带通滤光片的损伤机理。

The laser-induce damage threshold (LIDT) of Ta2O5/SiO2 two-cavity narrow-band interference filters with different central wavelength was investigated with a Nd∶YAG laser at 1064 nm under single-pulse mode, and the absorption measurement of such coatings was also performed by surface thermal lensing (STL) technique. It is found that the narrow-band interference filters showed different laser-induced damage behavior in the different zone (interband, band edge and rejection zone) of such coatings under high power laser irradiation. Using the electric distribution theoretical calculating, the experimental results have been analyzed in detail. The laser-induced damage behavior of such filters are in agreement with theoretical prediction.