Volume 14 Issue 3
May  2021
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Chinese Optics  > 2021  >  14(3): 536-543.
ZHOU Sheng, WANG Kai-xuan, LIU Ding-quan, HU Jin-chao, LI Yao-peng, WANG Shu-guang. Research on infrared dual-color filters with 3.2~3.8 μm and 4.9~5.4 μm bands[J]. Chinese Optics, 2021, 14(3): 536-543. doi: 10.37188/CO.2020-0206
Citation: ZHOU Sheng, WANG Kai-xuan, LIU Ding-quan, HU Jin-chao, LI Yao-peng, WANG Shu-guang. Research on infrared dual-color filters with 3.2~3.8 μm and 4.9~5.4 μm bands[J]. Chinese Optics, 2021, 14(3): 536-543. doi: 10.37188/CO.2020-0206
shu

Research on infrared dual-color filters with 3.2~3.8 μm and 4.9~5.4 μm bands

  • 1.

    Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

  • 2.

    School of Physical Science and Technology, Shanghai Tech University, Shanghai 200031, China

  • 3.

    University of Chinese Academy of Sciences, Beijing 100049, China

Funds:  Supported by National Natural Science Fundation of China (No. 61705248)
More Information
  • Corresponding author: dqliu@mail.sitp.ac.cn
  • Received Date: 26 Nov 2020
  • Rev Recd Date: 18 Dec 2020
    • Available Online: 05 Feb 2021
  • Publish Date: 14 May 2021
    Abstract
  • The dual-color (dual band-pass) filter is a new type of optical element that includes two precisely controlled spectral channels at any geometric position and can improve the target recognition ability of optical detection devices. Single crystal Ge is used as a substrate, and Ge and ZnSe are used as high (H) and low (L) reflective index thin film materials, respectively. An infrared dual-color filter is designed with two band-pass channels: 3.2~3.8 μm (channel 1) and 4.9~5.4 μm (channel 2). Thin films are fabricated by thermal evaporation in a high vacuum chamber, and the film thickness are monitored using the POEM (Percent of Optical Extreme Monitoring) strategy. At a working temperature of 100 K, the average transmittance of channel 1 was 94.2%, and its top ripple amplitude was 5.7%; the average transmittance of channel 2 was 96.5%, and its top ripple amplitude was 0.6%. In the cut-off range between the two channels (4.0~4.7 μm), the average transmittance was no more than 0.16%. The infrared dual-color filter has good optical stability, which is conducive to the recognition of high-speed moving targets.

     

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