Full-band error control and crack-free surface fabrication techniques for ultra-precision fly cutting of large-aperture KDP crystals  

作　　者：F. H. ZHANG S. F. WANG C. H. AN J. WANG Q. XU 

机构地区：[1]Department of Mechanical Engineering, Harbin Institute of Technology,Harbin 150001, China [2]Chengdu Fine Optical Engineering Research Center, Chengdu 610041,China

出　　处：《Frontiers of Mechanical Engineering》2017年第2期193-202,共10页机械工程前沿（英文版）

摘　　要：Large-aperture potassium dihydrogen phos- phate （KDP） crystals are widely used in the laser path of inertial confinement fusion （ICF） systems. The most common method of manufacturing half-meter KDP crystals is ultra-precision fly cutting. When processing KDP crystals by ultra-precision fly cutting, the dynamic characteristics of the fly cutting machine and fluctuations in the fly cutting environment are translated into surface errors at different spatial frequency bands. These machin- ing errors should be suppressed effectively to guarantee that KDP crystals meet the full-band machining accuracy specified in the evaluation index. In this study, the anisotropic machinability of KDP crystals and the causes of typical surface errors in ultra-precision fly cutting of the material are investigated. The structures of the fly cutting machine and existing processing parameters are optimized to improve the machined surface quality. The findings are theoretically and practically important in the development of high-energy laser systems in China.Large-aperture potassium dihydrogen phos- phate （KDP） crystals are widely used in the laser path of inertial confinement fusion （ICF） systems. The most common method of manufacturing half-meter KDP crystals is ultra-precision fly cutting. When processing KDP crystals by ultra-precision fly cutting, the dynamic characteristics of the fly cutting machine and fluctuations in the fly cutting environment are translated into surface errors at different spatial frequency bands. These machin- ing errors should be suppressed effectively to guarantee that KDP crystals meet the full-band machining accuracy specified in the evaluation index. In this study, the anisotropic machinability of KDP crystals and the causes of typical surface errors in ultra-precision fly cutting of the material are investigated. The structures of the fly cutting machine and existing processing parameters are optimized to improve the machined surface quality. The findings are theoretically and practically important in the development of high-energy laser systems in China.

关 键 词：ultra-precision fly cutting large-aperture KDP crystals spatial frequency processing error 

分 类 号：O734[理学—晶体学] TS93[轻工技术与工程]