Design of a transmission confocal athermal optical system for LWIR and MWIR

Shao-nan Li; Jin-ping Luo; Dan-dan Zhang; Xiao Wang; Fei Xie

doi:10.1117/12.2663058

4 April 2023 Design of a transmission confocal athermal optical system for LWIR and MWIR

Shao-nan Li, Jin-ping Luo, Dan-dan Zhang, Xiao Wang, Fei Xie

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 126170I (2023) https://doi.org/10.1117/12.2663058
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

There is a strong demand for lightweight, miniaturization and non-heating in the design of airborne infrared dual band optical system. A transmissive infrared optical system is introduced, which can meet the confocal requirements of medium wave infrared and long wave infrared light and can realize non heating design in the temperature range of - 55 ℃~+71 ℃. By deeply analyzing the non-thermal mathematical and physical core, combining the difference of dispersion coefficient and thermal difference coefficient of different materials, using germanium, zinc sulfide and zinc selenide with appropriate positive and negative optical powers, a common optical path structure of the secondary imaging optical system with a "4+4" configuration is designed, with a focal length of 200mm and a F number of 2; Indium steel and aluminum are used for the base and the mirror tube, and the difference of thermal expansion coefficient between the two materials is used to achieve heat dissipation difference. This design method can realize the design of dual band non thermal optical system at a lower cost. Its transmissivity, distortion, MTF, cold reflection and other indicators meet the design requirements. The optical system achieves the imaging effect of high transmissivity of medium and long wavelength infrared light.

Citation Download Citation

Shao-nan Li, Jin-ping Luo, Dan-dan Zhang, Xiao Wang, and Fei Xie "Design of a transmission confocal athermal optical system for LWIR and MWIR", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 126170I (4 April 2023); https://doi.org/10.1117/12.2663058

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