Athermalization optical design of dual-wavelength infrared optical system with double-layer harmonic elements

Fuzeng Kang; Yangyu Fan; Guoyun Lv; Yongshen Gao; Hao Wang; Yichao Li

doi:10.1117/12.2521909

24 January 2019 Athermalization optical design of dual-wavelength infrared optical system with double-layer harmonic elements

Fuzeng Kang, Yangyu Fan, Guoyun Lv, Yongshen Gao, Hao Wang, Yichao Li

Author Affiliations +

Proceedings Volume 11052, Third International Conference on Photonics and Optical Engineering; 110520V (2019) https://doi.org/10.1117/12.2521909
Event: The International Conference on Photonics and Optical Engineering, 2018, Xi'an, China

Abstract

A mathematical model of the diffraction efficiency change with the ambient temperature for the double-layer harmonic diffractive elements (HDE) is presented, and its effects are analyzed in this paper. The double-layer HDE structure is investigated and the optimization procedure is based on the equation of diffraction efficiency of the double-layer HDEs. By selecting appropriate design wavelength, the average diffraction efficiency of the system is reaching 99% in working wavelength and working temperature, which improves the image contrast and the image quality significantly. A set of dual-wavelength infrared optical system is designed based on dual-wavelength 320x240 element cooled thermal IR focal plane arrays detector. By introducing double-layer HDEs and aspheric surfaces, the chromatic aberration and the off-axis aberration are well corrected and the system structure is simplified. The system working in the wave band of 3.7~4.8μm and 7.7~9.5μm and with the F number of 2 is consisted of 8 elements and has 100% cold shield efficiency. The image quality evaluating results show that the performance of the dual-wavelength infrared optical system is very well in temperature from -40C° to +60C°.

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Fuzeng Kang, Yangyu Fan, Guoyun Lv, Yongshen Gao, Hao Wang, and Yichao Li "Athermalization optical design of dual-wavelength infrared optical system with double-layer harmonic elements", Proc. SPIE 11052, Third International Conference on Photonics and Optical Engineering, 110520V (24 January 2019); https://doi.org/10.1117/12.2521909

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KEYWORDS

Optical design

Infrared radiation

Diffraction

Infrared imaging

Modulation transfer functions

Image quality standards

Infrared detectors

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