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Chinese Journal of Lasers, Volume. 49, Issue 11, 1105001(2022)

Experimental Study on Dynamic Characteristics of Focal Spots of Spectral Dispersion Smoothing Beams

Jun He1,2, Ping Li1、*, Xiangxu Chai1, Liquan Wang1, Guanzhong Wang1, and Xiaolin Tian1
Author Affiliations
  • 1Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China
  • 2Graduate School, China Academy of Engineering Physics, Beijing 100088, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (11)
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    References (15)
    Cited By (2)
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    Figures & Tables(11)
    Schematic of SSD technique

    Fig. 1. Schematic of SSD technique

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    Numerical simulation images of one-dimensional light intensity evolution with time for single speckle of SSD beam focal spot. (a) 2.488 GHz modulation along SSD scanning direction; (b) 19.900 GHz modulation along SSD scanning direction; (c) 2.488 GHz modulation along vertical SSD scanning direction; (d) 19.900 GHz modulation along vertical SSD scanning direction

    Fig. 2. Numerical simulation images of one-dimensional light intensity evolution with time for single speckle of SSD beam focal spot. (a) 2.488 GHz modulation along SSD scanning direction; (b) 19.900 GHz modulation along SSD scanning direction; (c) 2.488 GHz modulation along vertical SSD scanning direction; (d) 19.900 GHz modulation along vertical SSD scanning direction

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    Schematic of experimental light path arrangement

    Fig. 3. Schematic of experimental light path arrangement

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    Narrow band laser without SSD. (a) Dynamic evolution image of focal spot intensity; (b) one-dimensional spatial distribution of light intensity within 20 ps integration time from certain moment

    Fig. 4. Narrow band laser without SSD. (a) Dynamic evolution image of focal spot intensity; (b) one-dimensional spatial distribution of light intensity within 20 ps integration time from certain moment

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    Dynamic evolution images of focal spot along SSD scanning direction. (a) 2.488 GHz modulation; (b) 19.900 GHz modulation

    Fig. 5. Dynamic evolution images of focal spot along SSD scanning direction. (a) 2.488 GHz modulation; (b) 19.900 GHz modulation

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    Spatial intensity distribution of focal spot along SSD scanning direction within 20 ps integration time from certain moment

    Fig. 6. Spatial intensity distribution of focal spot along SSD scanning direction within 20 ps integration time from certain moment

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    Center of focal spot light intensity versus time along SSD scanning direction

    Fig. 7. Center of focal spot light intensity versus time along SSD scanning direction

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    Dynamic evolution images of focal spot along vertical SSD scanning direction. (a) 2.488 GHz modulation; (b) 19.900 GHz modulation

    Fig. 8. Dynamic evolution images of focal spot along vertical SSD scanning direction. (a) 2.488 GHz modulation; (b) 19.900 GHz modulation

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    Spatial intensity distribution of focal spot along vertical SSD scanning direction within 20 ps integration time from certain moment

    Fig. 9. Spatial intensity distribution of focal spot along vertical SSD scanning direction within 20 ps integration time from certain moment

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    Center of focal spot light intensity versus time along vertical SSD scanning direction

    Fig. 10. Center of focal spot light intensity versus time along vertical SSD scanning direction

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    • Table 1. Focal spot amplitude modulation depth for different SSD parameters

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      Table 1. Focal spot amplitude modulation depth for different SSD parameters

      RegionWithout SSDAlong SSDVertical SSD
      @2.488 GHz@19.900 GHz@2.488 GHz@19.900 GHz
      A10.1082.6351.9196.8164.19
      B5.0275.2682.1965.4255.04
      C5.5243.8753.9293.9056.51
      D6.6444.2735.3360.3950.43
      E6.7044.4560.09115.6648.84
      F8.0778.8742.7646.6159.65
      G7.7468.8075.6464.8977.93
      7.1162.5957.4177.6758.94
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    Jun He, Ping Li, Xiangxu Chai, Liquan Wang, Guanzhong Wang, Xiaolin Tian. Experimental Study on Dynamic Characteristics of Focal Spots of Spectral Dispersion Smoothing Beams[J]. Chinese Journal of Lasers, 2022, 49(11): 1105001

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    Paper Information

    Category: Beam transmission and control

    Received: Sep. 28, 2021

    Accepted: Nov. 15, 2021

    Published Online: Jun. 2, 2022

    The Author Email: Li Ping (liping1984@caep.cn)

    DOI:10.3788/CJL202249.1105001

    Topics

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