• Infrared and Laser Engineering
  • Vol. 50, Issue 3, 20200197 (2021)
Yuchen Zhao1, Changhong Hu1, Hengyi Lv1, Ming Sun2, and Zhaonan Li3
Author Affiliations
  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, China
  • 2College of Computer Science and Technology, Jilin University, Changchun 13002, China
  • 3Beijing Satellite Navigation Center, Beijing 100094, China
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    DOI: 10.3788/IRLA20200197 Cite this Article
    Yuchen Zhao, Changhong Hu, Hengyi Lv, Ming Sun, Zhaonan Li. Design of high-density coaxial four-mirror optical system with field-bias and multi-light-channel coupled[J]. Infrared and Laser Engineering, 2021, 50(3): 20200197 Copy Citation Text show less
    Layout of coaxial four-mirror optical system
    Fig. 1. Layout of coaxial four-mirror optical system
    Initial configuration of the system
    Fig. 2. Initial configuration of the system
    Optical pathway diagram of system
    Fig. 3. Optical pathway diagram of system
    Optical pathway diagram of MWIR channel
    Fig. 4. Optical pathway diagram of MWIR channel
    Location of the field of view
    Fig. 5. Location of the field of view
    MTF curves of different channel
    Fig. 6. MTF curves of different channel
    Distortion grid of different channel
    Fig. 7. Distortion grid of different channel
    Curves of tolerance probability
    Fig. 8. Curves of tolerance probability
    Radius/mmThickness/mmConicAspheric surface high-order termMirror size/mm
    Primary mirror−1028.272−420−0.98688thΦ400
    Secondary mirror−224.486676.2−1.5875-Φ88
    FM-−175.3--98×65
    Tertiary mirror403.217230.5−1.12458th148×56
    Quartus mirror−981.876−237.21--Φ53
    Table 1. [in Chinese]
    123456
    x/(°) 00.350.490.70.7−0.7
    y/(°) 0.750.750.750.750.650.85
    Table 2. [in Chinese]
    FOVVIS WFE RMSMWIR WFE RMS
    (0°, 0.75°)0.01830.041
    (0.35°, 0.75°)0.01550.0281
    (0.49°, 0.75°)0.01790.0255
    (0.70°, 0.75°)0.01980.0281
    (0.70°, 0.65°)0.01970.0292
    (−0.70°, 0.85°)0.02660.03
    Table 3. [in Chinese]
    No.FOVChannel
    VIS channelMWIR channel
    1(0°, 0.75°)RMS=0.0027 100% size=0.0063 RMS=0.0097 100% size=0.018
    2(0.35°, 0.75°)RMS=0.0021 100% size=0.0051 RMS=0.0061 100% size=0.013
    3(0.49°, 0.75°)RMS=0.0020 100% size=0.0047 RMS=0.0062 100% size=0.019
    4(0.70°, 0.75°)RMS=0.0021 100% size=0.0038 RMS=0.0063 100% size=0.019
    5(0.70°, 0.65°)RMS=0.0020 100% size=0.0045 RMS=0.0069 100% size=0.025
    6(−0.70°, 0.85°)RMS=0.0026 100% size=0.0056 RMS=0.0076 100% size=0.022
    Table 4. [in Chinese]
    TypeItemPrimary mirrorSecondary mirrorThird mirrorQuartus mirror
    Displacement x/mm Reference for alignment0.050.030.08
    Displacement y/mm 0.020.050.05
    AssemblingDisplacement z/mm 0.10.050.08
    Tilt α/(″) 152020
    Tilt β/(″) 101020
    Tilt γ/(″) 3020-
    ΔR/mm 10.50.81
    ManufacturingΔK0.00080.0020.002-
    ΔB5.0×10−20-5×10−17-
    ΔC5.0×10−25-5×10−20-
    Surface error RMS(λ=632.8 nm) λ/50 λ/60 λ/50 λ/30
    Table 5. [in Chinese]
    TypeItemLens 1Lens 2Lens 3Lens 4Lens 5
    Displacement x/mm 0.020.050.020.040.05
    Displacement y/mm 0.020.050.020.040.05
    AssemblingDisplacement z/mm 0.040.080.040.10.1
    Tilt α/(″) 1520151520
    Tilt β/(″) 1520151520
    DLF33333
    ManufacturingΔK(concave surface) 0.002--0.002-
    Surface error RMS(λ=632.8 nm) λ/30 λ/30 λ/30 λ/30 λ/30
    Table 6. [in Chinese]
    Cumulative probability MTF
    Visible(71.4 lp/mm)MWIR(25 lp/mm)
    50%0.3710.395
    84.1%0.3630.347
    97.7%0.3510.318
    99.9%0.3320.305
    Table 7. [in Chinese]
    Yuchen Zhao, Changhong Hu, Hengyi Lv, Ming Sun, Zhaonan Li. Design of high-density coaxial four-mirror optical system with field-bias and multi-light-channel coupled[J]. Infrared and Laser Engineering, 2021, 50(3): 20200197
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