Refrigeration type infrared optical system of large relative aperture and super wide angle

The invention discloses a refrigeration type infrared optical system of large relative aperture and super wide angle. A refrigeration type infrared detector is employed, and a diaphragm of the optical system completely matches a cold diaphragm of the detector. The wide angle optical system uses a retrofocus type asymmetric structure, the relative aperture is large, and imaging of the super wide angle of 120 degree is realized. The system has the advantages that the image quality of the system approaches the diffraction limit, the size is small, the weight is low, and illumination is uniform.