23 August 2017 A lazy way to design infrared lens
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Abstract
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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RongSheng Qiu, JianDong Wu, LongJiang Chen, Kun Yu, HaoJun Pang, BaiZhen Hu, "A lazy way to design infrared lens", Proc. SPIE 10375, Current Developments in Lens Design and Optical Engineering XVIII, 103750U (23 August 2017); doi: 10.1117/12.2272643; https://doi.org/10.1117/12.2272643
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