针对红外搜索跟踪系统对目标的探测，为提高光学系统在复杂背景下的探测能力，设计了双色红外共口径光学系统。系统工作波段为红外中波3 μm~5 μm和红外长波8 μm~12 μm，采用分光型RC系统实现双波段共孔径清晰成像，总焦距为400 mm，相对孔径D/f′=1/2，全视场角为2°，为了抑制中波的热辐射杂光，对中波系统实现了二次成像，通过红外材料与光焦度的合理分配实现了折反式被动消热差设计。设计结果表明，系统在-40℃～+60℃工作温度下像质优良，能够满足红外搜索跟踪系统的使用需求。

Aiming at the needs of infrared (IR) searching and tracking system for target detection, a two-color infrared common aperture system was designed in order to improve the detection ability of optical system under complex environment. The working waveband of the system covered the medium-wave(3 μm~5 μm) and long-wave(8 μm~12 μm), the dual-band clear imaging was achieved by using dispersive Ritchey-Chrétien (RC) system, the overall focal length of the system was 400 mm, the relative aperture D/f′ was 1/2, and the full field of view was 2°. In order to suppress the medium-wave thermal radiation stray light, the mid-wave infrared (MWIR) system achieved the secondary imaging, through rational calculation of IR material and focal power, the optical passive athermal design was achieved. The results indicate that the image quality is excellent under the working temperature of -40℃~+60℃, which can meet the using requirement of infrared searching and tracking system.沈满德.超宽温折衍混合红外搜索跟踪光学系统设计[J].红外与激光工程, 2012 , 41(12): 241-245.SHEN Man-de.Design of infrared diffractive/refractive search and trace optical system beyond normal temperature[J]. Infrared and Laser Engineering, 2012,41(12): 241-245. (in Chinese with an English abstract)