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Proceedings Paper

Development of optimal mitigation contours and their machining flow by micro-milling to improve the laser damage resistance of KDP crystal
Author(s): Jian Cheng; Hao Yang; Qi Liu; Mingjun Chen; Wenjing Ma; Jiubin Tan; Chenhui An; Zhichao Liu
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Paper 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.

Paper Details

Date Published: 13 November 2017
PDF: 9 pages
Proc. SPIE 10447, Laser-Induced Damage in Optical Materials 2017, 104471L (13 November 2017);
Show Author Affiliations
Jian Cheng, Harbin Institute of Technology (China)
Hao Yang, Harbin Institute of Technology (China)
Qi Liu, Harbin Institute of Technology (China)
Mingjun Chen, Harbin Institute of Technology (China)
Wenjing Ma, Harbin Institute of Technology (China)
Jiubin Tan, Harbin Institute of Technology (China)
Chenhui An, China Academy of Engineering Physics (China)
Zhichao Liu, China Academy of Engineering Physics (China)

Published in SPIE Proceedings Vol. 10447:
Laser-Induced Damage in Optical Materials 2017
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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