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Athermalization optical design of dual-wavelength infrared optical system with double-layer harmonic elements
Author(s): Fuzeng Kang; Yangyu Fan; Guoyun Lv; Yongshen Gao; Hao Wang; Yichao Li
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Paper 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°.

Paper Details

Date Published: 24 January 2019
PDF: 10 pages
Proc. SPIE 11052, Third International Conference on Photonics and Optical Engineering, 110520V (24 January 2019); doi: 10.1117/12.2521909
Show Author Affiliations
Fuzeng Kang, Northwest Polytechnical Univ. (China)
Xi'an Institute of Optics and Precision Mechanics (China)
Yangyu Fan, Northwest Polytechnical Univ. (China)
Guoyun Lv, Northwest Polytechnical Univ. (China)
Yongshen Gao, Northwest Polytechnical Univ. (China)
Hao Wang, Xi'an Institute of Optics and Precision Mechanics (China)
Yichao Li, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 11052:
Third International Conference on Photonics and Optical Engineering
Ailing Tian, Editor(s)

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