Wide band off-axis reflection imaging system

In response to the urgent needs of military optoelectronic systems for field of view range, image quality, and system miniaturization, this article designs a large aperture off-axis tri reflection optical system according to design requirements. The off axis multi reflection structure is used to eliminate system obstruction and reduce structural size. By introducing complex surface shapes, the large aperture design is achieved. While ensuring sufficient resolution, increasing the field of view angle of the optical system can obtain richer target features and improve the system's target detection and recognition capabilities. The design result is an axial MTF ⪆ 0.35@120lp /Mm, RMS wavefront error 0.019 &lambda. The maximum distortion in the full field of view is 0.41%. Sensitivity analysis was conducted based on the actual system installation and debugging process, and the RMS wavefront error was 0.053 after the final system installation and debugging was completed λ. The use of near-infrared and shortwave cameras to image external scenery clearly and with clear details has certain guiding significance for the research of off-axis reflection imaging systems.