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

科研成果: 书/报告/会议事项章节会议稿件同行评审

摘要

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°.

源语言英语
主期刊名Third International Conference on Photonics and Optical Engineering
编辑Ailing Tian
出版商SPIE
ISBN(电子版)9781510627796
DOI
出版状态已出版 - 2019
活动3rd International Conference on Photonics and Optical Engineering - Xi'an, 中国
期限: 5 12月 20188 12月 2018

出版系列

姓名Proceedings of SPIE - The International Society for Optical Engineering
11052
ISSN(印刷版)0277-786X
ISSN(电子版)1996-756X

会议

会议3rd International Conference on Photonics and Optical Engineering
国家/地区中国
Xi'an
时期5/12/188/12/18

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