基于卡式结构的大口径连续变焦光学系统设计  

Design of large aperture continuous zoom optical system based on Cassegrain system

作　　者：刘昊 赵宇[1] 陈媛媛[1] 闫红宇 岳俊哲 李晋华[1] LIU Hao;ZHAO Yu;CHEN Yuanyuan;YAN Hongyu;YUE Junzhe;LI Jinhua(North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学,太原030051

出　　处：《激光杂志》2024年第3期35-39,共5页Laser Journal

基　　金：山西省面上自然基金项目(No.201901D111145)。

摘　　要：变焦系统可实现对大视场目标的搜索,但是大视场的轴外像差会对卡式结构的轴外成像产生严重影响,为了能同时实现大视场、长焦距连续变焦的目标,在卡式结构像方增加了一个矫正透镜,设计了一种工作场为0°~1.5°、焦距变化范围为800 mm~1600 mm的红外连续变焦系统。系统由卡塞格林望远镜结构和三组元机械补偿变焦结构组成,工作波长为1064 nm的激光,最大口径为300 mm,各个焦距下最大畸变小于0.5%。在17 lp/mm处各个焦距下的MTF均大于0.5,且接近衍射极限,弥散光斑尺寸很小,均在艾里斑内,成像质量良好,各视场下的像差均得到校正,各项指标都满足设计要求。The zoom system can search for the target with a large field of view,but the off-axis aberration of the large field of view will seriously affect the off-axis imaging of the card structure.In order to achieve the requirements of continuous zoom with a large field of view and a long focal length at the same time,a corrective lens is added to the image side of the card structure,and an infrared continuous zoom system with a working field of 0°~1.5°and a focal length range of 800 mm~1600 mm is designed.The system is composed of seglin telescope structure and three-component mechanical compensation zoom structure system.The working wavelength is 1064 nm,the maximum aperture is 300 mm,and maximum distortion at each focal length is less than 0.5%.At 17 lp/mm,the MTF at each focal length is greater than 0.5,which is close to the diffraction limit.The size of the diffuse spots is very small,all of which are in Airy spots.The aberrations in all fields of view are corrected,and all the indexes meet the design requirements.

关 键 词：卡塞格林 连续变焦 大口径 光学设计 

分 类 号：TN216[电子电信—物理电子学] TH703[机械工程—仪器科学与技术]