Infrared and Laser Engineering, Volume. 51, Issue 3, 20220007(2022)

Development of convex blazed grating in coded aperture spectral imager

Yushi Zhao, Wenjun He, Zhiying Liu, and Yuegang Fu
Author Affiliations
  • School of Opto-electronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
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    Figures & Tables(14)
    Optical path diagram of Offner coded aperture spectral imaging system
    Flow diagram of the design method for a convex blazed grating
    Optical design schematic of the dual-pass Offner spectroscopic system
    Information of the rays on the convex blazed grating
    Statistical histogram of incident angle, azimuth angle and polarization angle
    Iterative process of PSO optimization algoritm
    Fabrication of the convex blazed grating
    Test result of groove fabrication error of the convex blazed grating
    Topography of zero-order optical wavefront of the convex blazed grating
    Diffraction efficiency test of the convex blazed grating
    • Table 1. Specifications of coded aperture spectral imager

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      Table 1. Specifications of coded aperture spectral imager

      ParametersValue
      Wavelength range/μm3-5
      F-number 3.0
      Focal length/mm240
      Spatial resolution/mrad≤0.1
      Spectral resolution/nm100
      Detector array size640×512
      Detector pixel size/μm15
      DMD array size1920×1080
      DMD micromirror size/μm10.8
    • Table 2. Specifications of the dual-pass Offner spectroscopic sytem

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      Table 2. Specifications of the dual-pass Offner spectroscopic sytem

      ParametersValue
      Wavelength range/μm3-5
      Object plane size/mm29.6×7.68
      Object space NA0.164
      Spectral resolution/nm100
      Dispersion distance/mm2.4
      Optical magification1
    • Table 3. Design result of the dual-pass Offner spectroscopic sysytem

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      Table 3. Design result of the dual-pass Offner spectroscopic sysytem

      ParametersValue
      ${R_{\rm{G}}}$/mm 120
      ${R_{\rm{M}}}$/mm 240
      ${L_{{\rm{GM}}} }$/mm 117.827
      ${L_{\rm{O}}}$/mm 242.826
      ${L_{\rm{D}}}$/mm 235.866
      $ \Delta H $/mm 41
      $ d $/μm 100
      $ m $-1
      Length of the grating/mm102
      Width of the grating/mm46
    • Table 4. Initial Parameters of the PSO optimization algorithm

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      Table 4. Initial Parameters of the PSO optimization algorithm

      ParametersValue
      Number of particles20
      Maximum number of generations100
      Inertia factor $ {k_1} $0.8
      Constriction factor of individual $ {k_2} $0.5
      Constriction factor of swarm $ {k_3} $0.5
      Core functionRCWA
      Coating materialGold
      Substrate materialCopper
      Dimension2
      Number of spectrum channels20
      Variables$ \gamma $ & $ h $
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    Yushi Zhao, Wenjun He, Zhiying Liu, Yuegang Fu. Development of convex blazed grating in coded aperture spectral imager[J]. Infrared and Laser Engineering, 2022, 51(3): 20220007

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    Paper Information

    Category: Optical devices

    Received: Dec. 31, 2021

    Accepted: --

    Published Online: Apr. 8, 2022

    The Author Email:

    DOI:10.3788/IRLA20220007

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