大相对孔径红外消热差物镜设计

摘要

研究了大相对孔径光学系统的设计方法,讨论了光学设计初始的光焦度分配计算,设计了F数为0.9的大相对孔径红外消热差物镜。建立了由多个光组构成的组合光学系统的消热差模型,结合光学系统的结构型式和所选择的光学材料组合,获得了初始的光焦度分配,利用计算机辅助优化设计完成了像差校正。环境温度分析表明,在-40～60℃,该物镜成像质量稳定,调制传递函数（MTF）接近衍射极限。实际设计结果与理论计算结果相符合。%A design method for the optical system with a large relative aperture was researched and the initial optical power distribution of optical lenses was discussed. A F/0.9 infrared athermalized objective with a large relative aperture was proposed.Firstly,an athermal design model for the multiple-lens composed optical system was established.Then,by considering the systematic structure form and the selected optical materials,the initial optical power distribution among the lenses was accomplished.Finally,the aberration of the design was corrected by computer aid optimization design.The analysis of environment temperature shows that the image quality of the objective is stable in the change of temperature from 40 ℃ to 60 ℃ and its Modulation Transfer Function（MTF） approximates to the diffraction limit.The result of the implemented design agrees well with that of the theoretic computation.