High Power Laser and Particle Beams, Volume. 32, Issue 1, 011020(2020)

Influence of structural surface roughness on self-excited oscillation of main amplification system of high power laser device

Yuzhen Liao, Deen Wang*, Xuewei Deng, Xin Zhang, Ying Yang, Yuyuan Guo, Shengheng Zheng, Qiang Yuan, and Dongxia Hu
Author Affiliations
  • Research Center of Laser Fusion, CAEP, P. O. Box 919-988, Mianyang 621900, China
  • show less
    Figures & Tables(15)
    Amplifier optical path structure and self-oscillation time waveform in the back of cavity mirror
    Ablative trace near the aperture of the spatial filter
    Two-dimensional Gaussian rough surface constructed by Monte-Carlo method
    Simulated circular light spot which is reflected by a Gaussian rough surface
    Resonant cavity between the orifice plate and the cavity mirror
    Surface roughness comparison of samples prepared by shot blasting
    Relationship between aperture size, surface roughness and the proportion of reflected laser entering the main amplification system
    Experiment procedure
    Spot image collected on CCD
    Simulated spot image
    Statistical distribution of light intensity
    Increasing the surface roughness of the structure
    Self-oscillation waveform test before and after increasing the surface roughness of the structure
    • Table 1. Qualitative division of surface roughness

      View table
      View in Article

      Table 1. Qualitative division of surface roughness

      geometric statisticstypical scattering characteristicsrepresentative surface
      subtle roughnessδs<0.1,lλspecular reflection with specular reflection peakmachine-finished surface, calm water surface
      slight roughness0.1<δs<0.3,lλnear diffuse reflection with peaks between mirror and normal direction ground surface, general machined surface
      strong roughness0.3<δs<1,l≈λdiffuse reflection with backward enhancement and significant depolarization effect artificial special surface
      extreme roughnessδs>1,l<λsimilar to an ideal reflectorunknown surface
    • Table 2. Comparison of sample surface process statistics

      View table
      View in Article

      Table 2. Comparison of sample surface process statistics

      σ/μm l/μm δs
      1#0.514.230.171
      2#0.955.720.235
      3#1.467.240.285
      4#1.958.780.314
    Tools

    Get Citation

    Copy Citation Text

    Yuzhen Liao, Deen Wang, Xuewei Deng, Xin Zhang, Ying Yang, Yuyuan Guo, Shengheng Zheng, Qiang Yuan, Dongxia Hu. Influence of structural surface roughness on self-excited oscillation of main amplification system of high power laser device[J]. High Power Laser and Particle Beams, 2020, 32(1): 011020

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: Research Article

    Received: Jul. 23, 2019

    Accepted: --

    Published Online: Mar. 31, 2020

    The Author Email: Deen Wang (sduwde@126.com)

    DOI:10.11884/HPLPB202032.190274

    Topics