Chinese Journal of Lasers, Volume. 48, Issue 9, 0903004(2021)

Scattering Properties of Low-Loss 1064 nm Bandpass Filter Multilayer Films

Dongmei Liu1, Yunfeng Luo1、*, Xiuhua Fu1, Ganghua Bao2, Jing Zhang1, and Cheng Lu2
Author Affiliations
  • 1School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China
  • 2Chengdu Guotai Vacuum Equipment Co., Ltd., Chengdu, Sichuan 611130, China
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    Figures & Tables(21)
    Schematic of surface scattered light
    Surface morphology of substrate
    Optical constants of TiO2 material. (a) Refractive index; (b) extinction coefficient
    Optical constants of SiO2 material. (a) Refractive index; (b) extinction coefficient
    Angle resolved scattering curves of two designed films. (a) Short-wave near substrate; (b) short-wave near air
    Theoretically designed curve of transmittance. (a) Transmittance; (b) reflectance
    Spectral test curve of film prepared at two processes. (a) Transmittance; (b) reflectance
    Layer sensitivity. (a) First-order layer; (b) second-order layer
    Transmittance curve influenced by random error
    Transmittance curve influenced by SiO2 Tooling
    Surface morphologies of film prepared at two processes. (a) Process A; (b) process B
    SEM images of film. (a) Process A; (b) process B
    Integral scattering of film. (a) Process A; (b) process B
    Test and fitting curves of film prepared at different oxygen partial pressures
    Test and fitting curves of film prepared at same oxygen partial pressure
    Comparison of design and test curves
    • Table 1. Surface roughness of substrate

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      Table 1. Surface roughness of substrate

      SubstrateRa/nmRp/nm
      Fig.2(a)1.0521.309
      Fig.2(b)0.9851.285
    • Table 2. Optical constants of two materials used in design

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      Table 2. Optical constants of two materials used in design

      MaterialRefractive index@1064 nmExtinction coefficient@1064 nm
      TiO22.243240
      SiO21.453120
    • Table 3. Spectral design requirements

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      Table 3. Spectral design requirements

      ItemWavelength /nmTransmittance /%
      Short-wavelengthstopband /nm400--1025<0.5(ave)<1.5(max)
      Centre wavelength /nm1064--
      Passband /nm1040--1090≥95(ave)
      Full width at halfmaximum /nm55--62--
      Long-wavelengthstopband /nm1105--1300<0.3(ave)<1(max)
    • Table 4. Two deposition processes for preparing filter thin film

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      Table 4. Two deposition processes for preparing filter thin film

      ProcessSubstratetemperature /℃Pressure controlvacuum /PaEvaporation rate /(nm·s-1)Ion beam source
      TiO2SiO2TiO2SiO2Screen voltage /VBeam /mA
      A1502×10-22×10-20.30.6400200
      B2×10-28×10-3
    • Table 5. Surface roughness of film prepared at two processes

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      Table 5. Surface roughness of film prepared at two processes

      ProcessRa/nmRp/nm
      A1.1271.485
      B6.7518.252
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    Dongmei Liu, Yunfeng Luo, Xiuhua Fu, Ganghua Bao, Jing Zhang, Cheng Lu. Scattering Properties of Low-Loss 1064 nm Bandpass Filter Multilayer Films[J]. Chinese Journal of Lasers, 2021, 48(9): 0903004

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    Paper Information

    Category: materials and thin films

    Received: Sep. 24, 2020

    Accepted: Nov. 11, 2020

    Published Online: May. 17, 2021

    The Author Email: Luo Yunfeng (2018100212@mails.cust.edu.cn)

    DOI:10.3788/CJL202148.0903004

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