红外与激光工程, 2019, 48 (9): 0905006, 网络出版: 2019-10-12  

Lyot型双折射滤波片在DF化学激光器中的应用研究

Application of Lyot birefringent filters in DF chemical laser
作者单位
中国船舶重工集团公司第七一八研究所,河北 邯郸 056027
摘要
综合考虑调制深度、调谐率、自由光谱范围、走离角等各项因素,设计了一组Lyot型双折射滤波片,由三块厚度相同的白宝石晶体构成,每个滤波片厚度为9 mm,三块滤波片同光轴方向平行放置。为减小光在滤波片表面的反射损耗,光以布儒斯特角入射透过滤波片组。通过设计光轴与晶体表面的夹角为63°,绕其面法线旋转滤波片组,可以实现从3.6~4.3 μm不同波长的可调谐输出。考虑到滤波片的加工误差和入射角度的调节偏差,分别对不同光轴倾角和入射角度进行了计算,可以通过旋转双折射滤波片组实现输出波长的校正。Lyot型双折射滤波片插入损耗小,使用简单,操作方便,有较好的调谐和选频作用,对于研究DF化学激光器众多谱线中的单支或者多支有着十分重要的意义。
Abstract
Considering the effect of modulation depth, tuning rate, free spectral range, walk-off angle, a type of birefringent filters (BRFs) was designed, which consisted of the same three sapphire crystals plates. The birefringent filters′ thickness was 9 mm. They were placed parallelly with the same axis. In order to reduce the reflection loss of the surface, light incidented through BRFs at Brewster′s angle. According to design the tilt angle between optic axis to the surface of the plate which was 63°, tuning was accomplished by rotating the plates as a whole about an axis perpendicular to the surface; finally the spectrum from 3.6 to 4.3 μm can be output. Considering the mismachining tolerance of BRFs and the deviation of incident angle adjustment, the calculation was accomplished from different tilt angle and incident angle respectively, the output wavelength correction can be realized by rotating the plates. BRFs are low-cost and easy to use. Besides, they have a good function of tuning and selecting the different frequency. It′s useful to study the characters of DF chemical lasers′ spectrum.

杨珍, 任晓明, 赵海涛, 刘现魁, 王杰, 郭建增. Lyot型双折射滤波片在DF化学激光器中的应用研究[J]. 红外与激光工程, 2019, 48(9): 0905006. Yang Zhen, Ren Xiaoming, Zhao Haitao, Liu Xiankui, Wang Jie, Guo Jianzeng. Application of Lyot birefringent filters in DF chemical laser[J]. Infrared and Laser Engineering, 2019, 48(9): 0905006.

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