激光/红外共孔径无热化紧凑型光学系统设计

基于激光测距和红外目标探测需求,设计了激光/红外共孔径无热化紧凑型光学系统.系统参数设计如下:工作波段为1.064μm激光和7.7～9.3μm长波红外,入瞳直径均为120 mm;激光焦距为800 mm;长波红外焦距为240 mm,F数为2,视场为2.29°×1.83°.选择带有Ritchey-Chretien(RC)反射系统的折反式光学布局,缩短系统纵向尺寸.光学系统共用主镜和次镜,利用次镜实现激光和红外分光.长波红外采用二次成像结构,达到100％冷光阑效率.通过选择合适的光学材料、结构材料和合理分配光焦度,实现了光学被动式消热差.在-50℃～+70℃范围内,激光接收能量集中度高,长波红外成像质量良好,满足实际使用需求.

Common Aperture and Athermalization Design of Compact Laser/Infrared Optical System

Based on requirements of laser ranging and infrared target detection,a laser/infrared compact optical system with a common aperture and athermalization is designed.The parameters of the optical system are defined as follows:the operating waveband covers 1.064 mm of laser and 7.7-9.3 mm of wavelength infrared radiation(LWIR),the diameters of the two entrance pupils are 120 mm;the focal length of the laser is 800 mm;the focal length of the LWIR is 240 mm,the F-number is 2,the field of view is 2.29°×1.83°.the vertical size of system is shortened by utilizing a catadioptric optical system with RC.The laser system shares the primary mirror and secondary mirror with the LWIR system.The beam splitting of the laser and LWIR is achieved by the secondary mirror.By using the double imaging configuration,the LWIR system exhibits nearly 100%efficiency of the cold stop.Optical passive athermalization is realized by choosing the appropriate optical materials,mechanical materials and assigning the optical power.In the temperature range of-50℃to 70℃,the energy concentration of the laser receiving optical system is extremely high,and the image quality of the LWIR system is also quite good,which satisfies the requirements of practical applications.