Abstract
In order to reduce the difficulty of fixing the R-C reflective infrared system and enhance the stability of the second mirror, a compact structure is presented here composed of two transmittable aspheric surfaces and two reflective conicoid surfaces. The four surfaces were manufactured from a single Germanium lens. The two reflective surfaces formed by coating the inner reflect films were assembled in one lens which makes the installation of the two mirrors easier and the structure of the second mirror more stable. A design of mid-wave infrared compact imaging system is presented with a spectral range chosen as 3.7-4.8μm. The effective focal length is 90mm. The field of view for the lens is 4.88°×4.88°. It has good imaging capability with transmit function of all field of view more than 0.55 close to the diffraction limitation.
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