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Chinese Journal of Lasers, Volume. 50, Issue 19, 1905002(2023)

Complex Coherence Modulation of Laser Field Based on Random Microlens Array

Xueqiang Li1,2, Fang Wu1,2, Shuang Gong1,2, and Yang Bu1,2、*
Author Affiliations
  • 1Laboratory of Information Optics and Opto-Electronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (17)
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    References (22)
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    Figures & Tables(17)
    Thiessen polygons and random microlens arrays based on Thiessen polygonal arrangements. (a) Thiessen polygons; (b) random microlens array

    Fig. 1. Thiessen polygons and random microlens arrays based on Thiessen polygonal arrangements. (a) Thiessen polygons; (b) random microlens array

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    Structure diagram of random microlens array. (a) Three-dimensional diagram; (b) surface height fluctuation; (c) two-dimensional diagram

    Fig. 2. Structure diagram of random microlens array. (a) Three-dimensional diagram; (b) surface height fluctuation; (c) two-dimensional diagram

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    Simulation diagram. (a) Optics structure; (b) initial beam divergence angle; (c) beam divergence angle after random microlens array

    Fig. 3. Simulation diagram. (a) Optics structure; (b) initial beam divergence angle; (c) beam divergence angle after random microlens array

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    Microlens unit structure

    Fig. 4. Microlens unit structure

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    Divergence angle for different microlens element parameters

    Fig. 5. Divergence angle for different microlens element parameters

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    Young's interferometry with double holes

    Fig. 6. Young's interferometry with double holes

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    Interference fringes and fringe intensity distribution. (a) Without random microlens array; (b) through static random microlens array; (c) through rotating random microlens array (60 r/min)

    Fig. 7. Interference fringes and fringe intensity distribution. (a) Without random microlens array; (b) through static random microlens array; (c) through rotating random microlens array (60 r/min)

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    Interference fringe patterns at different rotation speeds. (a) 300 r/min; (b) 600 r/min; (c) 1200 r/min; (d) 2400 r/min

    Fig. 8. Interference fringe patterns at different rotation speeds. (a) 300 r/min; (b) 600 r/min; (c) 1200 r/min; (d) 2400 r/min

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    Schematic of experimental setup

    Fig. 9. Schematic of experimental setup

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    Surface profile of random microlens array. (a) Observation by microscope; (b) observation by interferometer

    Fig. 10. Surface profile of random microlens array. (a) Observation by microscope; (b) observation by interferometer

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    Diagram of divergence angle measurement

    Fig. 11. Diagram of divergence angle measurement

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    Experimental interference fringe patterns. (a) Without random microlens array; (b) through static random microlens array; (c) through rotating random microlens array (60 r/min)

    Fig. 12. Experimental interference fringe patterns. (a) Without random microlens array; (b) through static random microlens array; (c) through rotating random microlens array (60 r/min)

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    Experimental interference fringe patterns at different rotation speeds. (a) 300 r/min; (b) 600 r/min; (c) 1200 r/min; (d) 2400 r/min

    Fig. 13. Experimental interference fringe patterns at different rotation speeds. (a) 300 r/min; (b) 600 r/min; (c) 1200 r/min; (d) 2400 r/min

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    Image of double-hole light spots

    Fig. 14. Image of double-hole light spots

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    Modulus of complex coherence varies with rotation speed

    Fig. 15. Modulus of complex coherence varies with rotation speed

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    • Table 1. Double-hole light intensity ratio and modulus of complex coherence at different rotation speeds

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      Table 1. Double-hole light intensity ratio and modulus of complex coherence at different rotation speeds

      Speed /（r·min-1）Light intensityratioFringecontrast VModulus of complexcoherence γ12
      00.86470.91390.9164
      600.95610.35250.3526
      3000.95440.19920.1993
      6000.95260.11080.1108
      12000.95340.07250.0725
      24000.95410.05280.0528
      36000.95230.03980.0398
      48000.95220.03050.0305

    • Table 2. Percentage decrease of modulus of complex coherence with every 60 r/min increase in different speed ranges

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      Table 2. Percentage decrease of modulus of complex coherence with every 60 r/min increase in different speed ranges

      Speed range /（r·min-1）Reduction percentage of complexcoherence with every 60 r/min speed increase /%
      0‒6061.52
      60‒30010.87
      300‒6008.88
      600‒12003.46
      1200‒24001.36
      2400‒36001.23
      3600‒48001.17
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    Xueqiang Li, Fang Wu, Shuang Gong, Yang Bu. Complex Coherence Modulation of Laser Field Based on Random Microlens Array[J]. Chinese Journal of Lasers, 2023, 50(19): 1905002

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    Paper Information

    Category: Beam transmission and control

    Received: Dec. 16, 2022

    Accepted: Mar. 15, 2023

    Published Online: Oct. 24, 2023

    The Author Email: Bu Yang (buyang@siom.ac.cn)

    DOI:10.3788/CJL221537

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology