小型化长出瞳距激光通信接收望远镜光学设计

Optical design of miniaturized laser communication receiving telescope with long exit pupil distance

为了减小激光通信终端体积与能耗,同时保证通光孔径和放大倍率,该文根据折反式望远镜的高斯光学及赛德尔像差理论设计了一款改进的Dall-Kirkham接收望远镜。该镜头由2片反射镜、5片透镜组成,接收信号光波长为974 nm和1550 nm,通光口径为60 mm,相对孔径为1/3.38,出瞳距为50 mm,视场角为6 mrad,总长为111.04 mm,工作温度为20℃±10℃。优化后镜头在0.5 mrad视场内波像差优于(1/40)λ,6 mrad视场内波像差优于(1/20)λ,能量集中。为了实现无热化设计,文中给出了结构材料的选取与设计方式,并分析了±10℃温差下光学系统的波像差变化,分析结果表明:镜头成像质量良好,满足应用需求。

In order to reduce the volume and energy consumption of the laser communication terminal,and to ensure the aperture and magnification,an improved Dall-Kirkham receiving telescope was designed according to the Gaussian optics and Seidel aberration theory of catadioptric telescopes.The lens consisted of two mirrors and five lenses,the wavelengths of the received signal light were 974 nm and 1550 nm,the aperture diameter was 60 mm,the relative aperture was 1/3.38,the exit pupil distance was 50 mm,the field of view angle was 6 mrad,the total length was 111.04 mm,and the working temperature was 20℃±10℃.The wave aberration of the optimized lens in the 0.5 mrad field of view was better than(l/40)λ,and that in the 6 mrad field of view was better than(l/20)λ,with the energy was concentrated.In order to realize the athermalization design,the selection and design of structural materials were given,and the wave aberration of optical system under±10℃was analyzed.The results show that the lens imaging quality is good and meets the application requirements.