13 November 2017 Development of optimal mitigation contours and their machining flow by micro-milling to improve the laser damage resistance of KDP crystal
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Abstract
Micro-machining has been regarded as the most promising method to mitigate the laser damage growth on KDP/DKDP crystal surfaces. In this work, the near-field and far-field light modulations caused by three kinds of typical mitigation contours (spherical, Gaussian and conical) were theoretically investigated and compared to determine the optimal contours for achieving the minimum light intensification. Then, based on Computer Aided Manufacturing (CAM), a specific machining flow combining layer milling (rough repairing) and spiral milling (fine repairing) was developed to repair the surface damage with high efficiency and surface quality. Finally, the morphology, transmittance and laser damage resistance of the repaired KDP surfaces were tested. The theoretical and experimental results indicate that the conical mitigation contours mostly possess the best repaired surface quality and optical performance. The developed combined rough and fine machining flow could be applied as a practical repairing flow to mitigate the laser-induced surface damage growth of KDP crystal optics.
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Jian Cheng, Hao Yang, Qi Liu, Mingjun Chen, Wenjing Ma, Jiubin Tan, Chenhui An, Zhichao Liu, "Development of optimal mitigation contours and their machining flow by micro-milling to improve the laser damage resistance of KDP crystal", Proc. SPIE 10447, Laser-Induced Damage in Optical Materials 2017, 104471L (13 November 2017); doi: 10.1117/12.2280519; https://doi.org/10.1117/12.2280519
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