Optimization of morphological parameters for mitigation pits on rear KDP surface : experiments and numerical modeling

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Yang, Hao and Cheng, Jian and Chen, Mingjun and Wang, Jian and Liu, Zhichao and An, Chenhui and Zheng, Yi and Hu, Kehui and Liu, Qi (2017) Optimization of morphological parameters for mitigation pits on rear KDP surface : experiments and numerical modeling. Optics Express, 25 (15). pp. 18332-18345. ISSN 1094-4087 (https://doi.org/10.1364/OE.25.018332)

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Abstract

In high power laser systems, precision micro-machining is an effective method to mitigate the laser-induced surface damage growth on potassium dihydrogen phosphate (KDP) crystal. Repaired surfaces with smooth spherical and Gaussian contours can alleviate the light field modulation caused by damage site. To obtain the optimal repairing structure parameters, finite element method (FEM) models for simulating the light intensification caused by the mitigation pits on rear KDP surface were established. The light intensity modulation of these repairing profiles was compared by changing the structure parameters. The results indicate the modulation is mainly caused by the mutual interference between the reflected and incident lights on the rear surface. Owing to the total reflection, the light intensity enhancement factors (LIEFs) of the spherical and Gaussian mitigation pits sharply increase when the width-depth ratios are near 5.28 and 3.88, respectively. To achieve the optimal mitigation effect, the width-depth ratios greater than 5.3 and 4.3 should be applied to the spherical and Gaussian repaired contours. Particularly, for the cases of width-depth ratios greater than 5.3, the spherical repaired contour is preferred to achieve lower light intensification. The laser damage test shows that when the width-depth ratios are larger than 5.3, the spherical repaired contour presents higher laser damage resistance than that of Gaussian repaired contour, which agrees well with the simulation results.

ORCID iDs

Yang, Hao, Cheng, Jian, Chen, Mingjun, Wang, Jian, Liu, Zhichao, An, Chenhui, Zheng, Yi, Hu, Kehui and Liu, Qi ORCID logoORCID: https://orcid.org/0000-0002-1960-7318;
  • Item type:Article
    ID code:81167
    Dates:
    Date
    Event
    20 July 2017
    Published
    7 July 2017
    Accepted
    Subjects:Science > Physics > Optics. Light
    Department:UNSPECIFIED
    Depositing user: Pure Administrator
    Date deposited:17 Jun 2022 05:39
    Last modified:11 Nov 2024 13:31
    URI:https://strathprints.strath.ac.uk/id/eprint/81167
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