• Acta Optica Sinica
  • Vol. 42, Issue 13, 1322001 (2022)
He Chen1, Yuting Sun1, Wangshu Tan1,*, Siying Chen1..., Yinchao Zhang1, Pan Guo1, Lifu Wang1, Guangxiang Jiang1 and Xin Li2,**|Show fewer author(s)
Author Affiliations
  • 1Key Laboratory of Photoelectric Imaging Technology and Systems, Ministry of Education, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 2Academy of Military Medical Sciences, Beijing 100850, China
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    DOI: 10.3788/AOS202242.1322001 Cite this Article Set citation alerts
    He Chen, Yuting Sun, Wangshu Tan, Siying Chen, Yinchao Zhang, Pan Guo, Lifu Wang, Guangxiang Jiang, Xin Li. Optical Design of Multi-Stage Confocal Parabolic Reflection Laser Beam Expander[J]. Acta Optica Sinica, 2022, 42(13): 1322001 Copy Citation Text show less
    Principle diagram of confocal parabolic reflection beam expander
    Fig. 1. Principle diagram of confocal parabolic reflection beam expander
    Beam expansion principle of two-stage beam expander 1
    Fig. 2. Beam expansion principle of two-stage beam expander 1
    Beam expansion principle of two-stage beam expander 2
    Fig. 3. Beam expansion principle of two-stage beam expander 2
    3D layouts of beam expanders. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2
    Fig. 4. 3D layouts of beam expanders. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2
    Illumination distributions of image plane of beam expanders. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2
    Fig. 5. Illumination distributions of image plane of beam expanders. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2
    RMS wavefront errors of system. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2
    Fig. 6. RMS wavefront errors of system. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2
    Field curves of beam expanders
    Fig. 7. Field curves of beam expanders
    Distortion of beam expanders
    Fig. 8. Distortion of beam expanders
    ParameterValue
    Wavelength of incident laser /μm0.9-1.7
    Divergence angle of incident laser /mrad2
    Waist radius of incident laser /mm0.5
    Magnification
    RMS(root-mean-square) wavefront error<0.02λ
    Table 1. Design indexes of beam expanders
    Beam expanderΔl /mmL /mm
    Single-group beam expander160170
    Two-stage beam expander 15595
    Two-stage beam expander 22585
    Table 2. Dimensions of three beam expanders
    Beam expanderSingle-group beam expander(9×)Two-stage beam expander 1(first stage: 3×; second stage: 3×)Two-stage beam expander 2(first stage: 2×; second stage: 4.5×)
    PMSMPM of first stageSM of first stagePM of second stageSM of second stagePM of first stageSM of first stagePM of second stageSM of second stage
    Curvature radius /mm180206020602040209020
    Off-axis amount /mm180206020602040209020
    Divergence angle of output beam/mrad0.22340.22340.2233
    Waist radius of output beam /mm4.51784.52054.5080
    Table 3. Parameters of three beam expanders
    ParameterSingle group beam expander(9×)

    Two-stage beam expander 1

    (first stage: 3×; second stage: 3×)

    Two-stage beam expander 2

    (first stage: 2×; second stage: 4.5×)

    SMPMSMPMSMPMSMPMSMPM
    TRAD /mm±0.06±0.06±0.02±0.02±0.02±0.02±0.02±0.02±0.02±0.02
    TTHI /mm±0.06±0.06±0.02±0.03±0.03±0.03±0.03±0.03±0.03±0.03
    TUDX /mm±0.04±0.05±0.01±0.01±0.02±0.02±0.01±0.01±0.02±0.02
    TUDY /mm±0.04±0.05±0.01±0.01±0.02±0.02±0.01±0.01±0.02±0.02
    TUTX /(°)±0.05±0.06±0.02±0.02±0.02±0.02±0.02±0.02±0.03±0.03
    TUTY /(°)±0.05±0.06±0.02±0.02±0.02±0.02±0.02±0.02±0.03±0.03
    TIRR±0.06±0.06±0.02±0.02±0.02±0.02±0.02±0.02±0.02±0.02
    Table 4. Tolerance parameters of beam expanders
    He Chen, Yuting Sun, Wangshu Tan, Siying Chen, Yinchao Zhang, Pan Guo, Lifu Wang, Guangxiang Jiang, Xin Li. Optical Design of Multi-Stage Confocal Parabolic Reflection Laser Beam Expander[J]. Acta Optica Sinica, 2022, 42(13): 1322001
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