Modeling of residual tool mark formation and its influence on the optical performance of KH2PO4 optics repaired by micro-milling

作者: Qi Liu , Jian Cheng , Hao Yang , Yafei Xu , Linjie Zhao

DOI: 10.1364/OME.9.003789

关键词:

摘要: In the micro-milling repair process of surface defects on KH2PO4 (KDP) optics, residual tool marks are inevitably introduced repaired surfaces. These could present great potential risks in lowering laser-induced damage thresholds KDP which has not been reported previous works. this work, formation micro-milled was initially modeled and then effect these optical performance optics investigated theoretically experimentally. A 3D generation model for contours is proposed to predict profiles micro ball-end milled surfaces, a numerical FEM adopting calculated established investigate light intensification inside based electromagnetic theory. The relationship between machining processes, intensifications as well laser resistance discussed comprehensively systematically. Practical experiments tests verified theoretical results very well. It revealed that height can induce apparent diffraction effect, consequently causing severe optics. milling strategies (e.g. combination layer-milling spiral paths) also exert positive role improving An optimized flow, path rough employing spiral-milling with intervals 10∼15 µm fine milling, recommended future practical engineering full-aperture ICF facilities.

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