摘要
针对中长波共光路小型化光学系统设计需求,建立了基于高斯光学与初级像差理论且尺寸受限下的二次成像结构光学指标分配模型。主镜因其边缘光线高度高和承担的光焦度小,其球差、色差和二级光谱是该系统像差的主要来源,为矫正二级光谱,可使用“-、+、-”结构形式的高、中、低相对色散材料的透镜组合作为主镜结构,此时主镜的残余像差较小,采用场镜降低中继镜组光线高度以及非球面矫正球差等方法平衡主镜残余像差。最后开展实例设计,对提出的小型化设计思想进行验证,设计了中波波长3.7~4.8μm、长波波长7.7~9.5μm的共光路双波红外小型光学系统,总长不大于135 mm,结构小巧紧凑,光学传函接近衍射极限,工作温度范围-40~60℃,且对温度不敏感。实现了基于二次成像结构光学指标分配模型的中长波共光路小型化光学系统分析及设计,满足中长波共光路小型化光学系统需求。
Objective This paper aims to realize the miniaturization design of medium and long wavelength common optical path optical systems.Methods An optical index allocation model for secondary imaging structures under size constraints based on Gaussian optics and primary aberration theory was established.Lens combinations of high,medium and low relative dispersion materials in the form of"-,+,-"structures are used as the primary mirror structure to correct the secondary spectrum;Meanwhile,field lenses and aspheric surfaces are used to correct spherical aberration to reduce the relay mirror.The light height is set to balance the residual aberration of the primary mirror.Results and Discussions Because of the high edge light height and small optical power of the primary mirror,its spherical aberration,chromatic aberration and secondary spectrum are the main sources of aberrations in the system.To correct the secondary spectrum,the"-,+,-"structure can be used.A lens combination of high,medium and low relative dispersion materials is used as the main mirror structure.At this time,the residual aberration of the main mirror is small.Field lenses are used to reduce the light height of the relay lens group and aspherical surfaces are used to correct spherical aberration to balance the residual main mirror Aberration.Conclusions Based on the above theory,a common optical path dual-wave infrared small optical system with a medium wave wavelength of 3.7-4.8μm and a long wave band of 7.7-9.5μm is designed.The total length of the system is no more than 135 mm,the structure is small and compact,the optical transfer function is close to the diffraction limit,and the operating temperature range covers-40-60℃and is not sensitive to temperature.The analysis and design of a medium and long-wavelength common optical path miniaturized optical system based on the secondary imaging structure optical index distribution model are realized to meet the needs of a medium and long-wavelength common optical path miniaturized optical system.
作者
亓晨
靳阳明
谢晓喻
侯辉辉
李永生
Qi Chen;Jin Yangming;Xie Xiaoyu;Hou Huihui;Li Yongsheng(The 27th Research Institute of China Electronics Technology Group Corporation,Zhengzhou 450047,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2024年第4期149-156,共8页
Infrared and Laser Engineering
关键词
光学设计
红外双波段共光路
像差矫正
杂散光分析
optical design
infrared dual band common optical path
aberration correction
stray light analysis
