Design of low distortion MWIR optical system with high resolution and large width

摘要

As to the need of low distortion MWIR optical system with high resolution and large width, the initial structure of the coaxial two-mirror and the relay optical system were calculated based on the aberration theory and Gauss's optical imaging formula. Accordning to the aberration auto-balance optimization of optical design software, the aspheric surface is introduced to correct residual aberration, and the compact requirment of infrared optical system was realized. Focal length 2000mm, F number 3, field of view 3°×0.5°, the operating wave band 3～5μm and 100% cold shied efficiency reached. High imaging quality was realized ,The modulation transfer function of the system exceed 0.34 all over the field of view at the Nyquist frequency of 331p/mm, and the relative distortion below 0.1%.The results of the design revealed the target depth that can be realized by the coaxial two-mirror system and relay optical system. The system can achieved a resolution 3.75m and a width of 26km.