Reflective system of four mirrors has a small volume and good image quality, which is used popularly in space detection and airborne filed. Here the formula of reflective system with four mirrors is deducted based on the third-order aberration,secondly the initial configuration of reflective system is calculated with formula, then the data of initial configuration is optimized by optical software ZEMAX. The off-axis reflective system is obtained based on the coaxial reflective system, the freeform surface is also added to extend the view field, finally an off-axis reflective system with large view field is designed and obtained.
We designed a compact middle-wave infrared (MWIR) lens with a large focal length ratio (about 1.5:1), used in the 3.7 to 4.8 μm range. The lens is consisted of a compact front group and a re-imaging group. Thanks to the compact front group configuration, it is possible to install a filter wheel mechanism in such a tight space. The total track length of the lens is about 50mm, which includes a 2mm thick protective window and a cold shield of 12mm. The full field of view of the lens is about 3.6°, and F number is less than 1.6, the image circle is about 4.6mm in diameter. The design performance of the lens reaches diffraction limitation, and doesn’t change a lot during a temperature range of -40°C~+60°C. This essay proposed a stepwise design method of infrared optical system guided by the qualitative approach. The method fully utilize the powerful global optimization ability, with a little effort to write code snippet in optical design software, frees optical engineer from tedious calculation of the original structure.
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