Optical Design of Multi-Stage Confocal Parabolic Reflection Laser Beam Expander

He Chen; Yuting Sun; Wangshu Tan; Siying Chen; Yinchao Zhang; Pan Guo; Lifu Wang; Guangxiang Jiang; Xin Li

doi:10.3788/AOS202242.1322001

Acta Optica Sinica, Volume. 42, Issue 13, 1322001(2022)

Optical Design of Multi-Stage Confocal Parabolic Reflection Laser Beam Expander

He Chen¹, Yuting Sun¹, Wangshu Tan^1、*, Siying Chen¹, Yinchao Zhang¹, Pan Guo¹, Lifu Wang¹, Guangxiang Jiang¹, and Xin Li^2、**

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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Figures & Tables(12)

Fig. 1. Principle diagram of confocal parabolic reflection beam expander

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Fig. 2. Beam expansion principle of two-stage beam expander 1

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Fig. 3. Beam expansion principle of two-stage beam expander 2

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Fig. 4. 3D layouts of beam expanders. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2

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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

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Fig. 6. RMS wavefront errors of system. (a) Single-group beam expander; (b) two-stage beam expander 1; (c) two-stage beam expander 2

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Fig. 7. Field curves of beam expanders

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Fig. 8. Distortion of beam expanders

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Table 1. Design indexes of beam expanders
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Table 1. Design indexes of beam expanders
Parameter Value
Wavelength of incident laser /μm 0.9-1.7
Divergence angle of incident laser /mrad 2
Waist radius of incident laser /mm 0.5
Magnification 9×
RMS（root-mean-square） wavefront error <0.02λ

Table 2. Dimensions of three beam expanders
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Table 2. Dimensions of three beam expanders
Beam expander Δl /mm L /mm
Single-group beam expander 160 170
Two-stage beam expander 1 55 95
Two-stage beam expander 2 25 85

Table 3. Parameters of three beam expanders

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Table 3. Parameters of three beam expanders

Beam expander	Single-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×）
Beam expander	PM	SM	PM of first stage	SM of first stage	PM of second stage	SM of second stage	PM of first stage	SM of first stage	PM of second stage	SM of second stage
Curvature radius /mm	180	20	60	20	60	20	40	20	90	20
Off-axis amount /mm	180	20	60	20	60	20	40	20	90	20
Divergence angle of output beam/mrad	0.2234		0.2234				0.2233
Waist radius of output beam /mm	4.5178		4.5205				4.5080

Table 4. Tolerance parameters of beam expanders

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Table 4. Tolerance parameters of beam expanders

Parameter	Single 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×）
Parameter	SM	PM	SM	PM	SM	PM	SM	PM	SM	PM
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

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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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