Infrared and Laser Engineering, Volume. 49, Issue 10, 20200036(2020)

Design of hybrid refractive-diffractive infrared dual-band zoom optical system

Hongtao Yang1... Xiaofan Yang1,2,*, Chao Mei1 and Weining Chen1 |Show fewer author(s)
Author Affiliations
  • 1Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciencs, Xi’an 710119, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
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    In this paper, the influence models of different diffraction elements on diffraction efficiency were established, and the diffraction efficiency among single diffraction element, harmonic diffraction element and double diffraction element was compared. The advantages of using double diffraction elements in infrared optical system were analyzed. The average diffraction efficiency of different material combinations was calculated. Based on this, a hybrid infrared dual-band and dual-field optical system suitable for airborne platform was designed. The resolution of the large field of view was 1.5 m@16 km. The long and the short focal length were 960 mm and 480 mm respectively. The zoom function was realized by switching the mirror to ensure the optical axis stability. The simulation results show that the MTF curves are smooth and close to the diffraction limit under the large temperature difference of -40 - +60 ℃. The RMS radius is within the radius of airy spots, and the minimum characteristic size of the binary diffraction surface is 6.9 μm. The design results meet the engineering requirements.

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    Hongtao Yang, Xiaofan Yang, Chao Mei, Weining Chen. Design of hybrid refractive-diffractive infrared dual-band zoom optical system[J]. Infrared and Laser Engineering, 2020, 49(10): 20200036

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    Paper Information

    Category: Infrared technology and application

    Received: Mar. 5, 2020

    Accepted: --

    Published Online: Jul. 6, 2021

    The Author Email: Xiaofan Yang (zflx_369@163.com)

    DOI:10.3788/IRLA20200036

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