Optical design of common aperture laser/IR light dual-band composite photoelectric guidance component

With the increasing level of confrontation between precision-guided weapons, the advantages of dual-mode composite guidance with high hit accuracy are becoming more. This paper designs a common aperture laser/IR light dual-band composite photoelectric guidance component. The common aperture optical structure can reduce the system size, IR imaging subsystem can obtain high-definition images of the target, and the laser receiving subsystem can perform high-precision positioning measurements on the center of the laser spot reflected by target. The entire system has an incident light aperture of 44 mm, an F number of 1 for the visible imaging system. At the spatial frequency of 42 lp/mm, the MTF value of the 0 field light is about 0.46, that of the full field light is about 0.36, and the RMS radius is 4.466 μm, the field distortion is about −0.13%. The system MTF does not vary by more than 10% within the operating temperature range from −40℃ to +70℃. Full reception field of view of laser receiving optical subsystem is ±4° and linear reception field of view is ±2°. When the laser emission power is greater than 0.6MW, the interception distance of the laser receiving optical system can be greater than 10 km. The overall optical system length is 88mm and the width is 53 mm. After adding the mechanical structure, the volume is 94 mm×68 mm×50 mm and the weight is 293 g. The system is simple and compact, easy to assemble and adjust, suitable for the trend of miniaturization of seekers, and has very high practical value.