Recent developments in the Infrared detector technology lead to imaging in multiple wave bands (MWIR and SWIR). It demands to development of 1-5 μm Common optics for the integration of SWIR, MWIR, Non Eye safe LRF and Eye safe LRF spectral bands against traditional optics. This common optics module coupled with the detector can meet the demands of 1-5 μm Multi spectral imaging which can improve the visibility in foggy weather, night and bad weather conditions and Multi-function applications like Thermal Imager, Low light imager, Laser Range Finder and Laser Designator. We present a design of a passive athermalized Wide Field of View (WFoV) Objective lens operating in 1-5 micron spectral band for a 1Kx1K format, 10 micron pixel pitch cooled detector. This lens has a 45 deg FoV and operates at F/4. The lens is passively compensated from -30 deg C to +50 deg C to work in all thermal environments.
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