1064nm激光与远红外共窗口成像系统波长分离膜的研制

Development of Wavelength Separation Coating in 1064nm Laser and Far-infrared Common-window Imaging System

根据激光与远红外共窗口成像系统的技术要求,研制了一种波长分离膜,实现通过共窗口的激光与远红外光分离成像,即1 064nm高反射、8~14μm高透射.分析薄膜的微观结构,研究了薄膜材料吸潮前后的折射率变化,结合光学薄膜理论,优化膜系结构.在薄膜应力的基础上,优化膜层厚度,提高薄膜牢固性.研制的分离膜,1064nm反射率为99.71%,8~12μm平均透过率为97.1%,12~14μm平均透过率为90.1%,满足户外环境中长期使用的要求.

According to the technical requirements of the laser and far infrared common-window imaging system,a wavelength separation coating was developed,which aimed to separate the laser and far infrared light through a common window,that is,1 064 nm laser reflected,8～14μm far infrared light transmitted.By analyzing the microstructure of the films,the refractive index changes of the films before and after moisture absorption were studied.The structure of the films was optimized by combining the optical film theory.On the basis of studying the stress of the film,the film thickness was optimized and the film firmness was improved.The average transmittance of the wavelength separation coating in the bands of 8～12μm、12～14μm are 97.1%,90.1% and the reflectivity of 1 064 nm is 99.71%.The separation coating can meet the technical requirements of the imaging system for a long time in various military outdoor environments.