Study on the optical performance and characterization method of texture on KH2PO4 surface processed by single point diamond turning
Study on the optical performance and characterization method of texture on KH2PO4 surface processed by single point diamond turning
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单点金刚石车削KH2PO4表面光学性能及织构表征方法研究
DOI：
10.1016/j.apsusc.2013.04.073
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发表时间：
2013-08-15
影响因子：
6.7
通讯作者：
Pang, Qilong
中科院分区：
文献类型：
--
作者：
Chen, Mingjun;Li, Mingquan;Pang, Qilong
基于傅里叶模型方法的分析表明，陡峭的剖面（较小的波周期或较大的深度）往往会降低KH2PO4（KDP）晶体的激光诱导损伤阈值（LIDT）。前后表面平行或垂直的纹理方向对光学元件的LIDT有不同的影响。功率谱密度(PSD)方法可以实现特定表面上的纹理周期、深度和方向信息，特别是角谱和径向谱。分形理论弥补了PSD方法在表征纹理粗糙度或表面加工质量方面的不足。分形维数越大，意味着表面波动剧烈，存在大量脆性缺陷，这与实验结果一致。周向轮廓分形维数分布也可以表征纹理方向，但当采样范围变小时或表面纹理不再明显时，其指向能力下降甚至丧失。在表征纹理方向方面，角谱比分形维数更准确。皇冠版权所有 (C) 2013 由 Elsevier B.V. 出版。保留所有权利。
The analysis based on the Fourier model method indicates that the steep profile (smaller wave period or larger depth) tends to decrease the laser induced damage threshold (LIDT) of KH2PO4 (KDP) crystal. The parallel or perpendicular texture directions on the front and back surfaces have different influences on the LIDT of optical components. Power spectrum density (PSD) method can realize the information of texture period, depth and direction on certain surface, especially the angular spectrum and radial spectrum. The fractal theory covers the shortage of PSD method in charactering the texture roughness or surface processing quality. The larger fractal dimension means that the surface fluctuates sharply and lots of brittle defects exist, this is consistent with the experimental results. The circumferential profile fractal dimension distribution also can characterize texture direction, but its directing ability decreases or even is lost when the sampling extent becomes small or the surface texture is not obvious any more. The angular spectrum is more accurate than the fractal dimension in charactering texture direction. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.