Volume 16 Issue 4
Jul.  2023
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SHANG Peng, CHEN Bei-xi, SUN Peng, LIU Hua-song, BAI Jin-lin, JI Yi-qin, CAO Bo, MA Yuan-fei, LIN Quan. Theoretical design and preparation of high performance MWiR notch filter[J]. Chinese Optics, 2023, 16(4): 904-915. doi: 10.37188/CO.2022-0193
Citation: SHANG Peng, CHEN Bei-xi, SUN Peng, LIU Hua-song, BAI Jin-lin, JI Yi-qin, CAO Bo, MA Yuan-fei, LIN Quan. Theoretical design and preparation of high performance MWiR notch filter[J]. Chinese Optics, 2023, 16(4): 904-915. doi: 10.37188/CO.2022-0193

Theoretical design and preparation of high performance MWiR notch filter

doi: 10.37188/CO.2022-0193
Funds:  Supported by the National Natural Science Foundation of China (No. 61905179); Natural Science Foundation of Hebei Province (No. F2022103002); Key R & D Projects of Hebei Province (No. 22351101D)
More Information
  • Author Bio:

    Shang Peng (1986—), male, Heze city, Shandong province, Ph.D., Senior Engineer. He received his Ph.D. degree from the University of Chinese Academy of Sciences in 2015, mainly engaged in the research of special optical materials and optical thin film design, preparation and testing. E-mail: shangpeng163@163.com

    Liu Hua-song (1980—), male, Fuxin city, Liaoning province, PhD, researcher, mainly engaged in design, preparation and characterization technology of the optical thin film, and optical thin film material physics. E-mail: liuhuasong@hotmail.com

    Cao Bo (1983—), male, Siping city, Jilin province, B.S., Engineer, received his B.S. degree from Changchun University of Science and Technology in 2007, mainly engaged in the research of optoelectronic materials, optical processing, optical thin film and its engineering applications. E-mail: caobo@guojing-tech.com

  • Corresponding author: liuhuasong@hotmail.comcaobo@guojing-tech.com
  • Received Date: 16 Sep 2022
  • Rev Recd Date: 08 Oct 2022
  • Available Online: 22 Dec 2022
  • In order to effectively suppress the interference of CO2 radiation 4.3 μm on MWiR target signal with wavelength of 3 μm−5 μm, based on the Needle random intercalation optimization algorithm, an accurate inversion correction model for the growth error of multi-layer ultra-thick Ge/Al2O3 films under quartz crystal monitoring is established by the electron beam evaporation method, thus realizing the design, the accurate inversion and the accurate preparation of MWiR notch filter. In order to solve the problem that the surface profile of the MWiR notch filter changes greatly, the preset substrate surface method is used to realize the low surface profile regulation of MWiR notch filter. The results show that the high refractive index Ge film has good deposition stability with the increase of coating time, while the deposition scale factor of low refractive index Al2O3 thin film changes up to 11.9% in a regular gradual trend. For the prepared MWiR notch filter, the average cut-off transmittance is less than 0.3% in the wavelength range of 4.2 μm−4.5 μm, and the average transmittances are more than 95% in the wavelength range of 3.5 μm−4.05 μm and 4.7 μm−5.0 μm. The surface profile of the substrate after coating can be effectively controlled in a small range. The film has good adaptability to complex environment, and has successfully passed the environmental test of firmness, high temperature, low temperature and damp heat specified in GJB 2485-95.

     

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