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| Research Progress on Precision and Ultra-Precision Grinding Mechanism and Key Technology on Sapphire Optical Elements With Complex Surface |
| WANG Sheng 1 ，ZHAO Qingliang 1 ，WANG Sheng 1 ，WANG Jinhu 2 ，QI Chunliang 1 ，WANG Jianyong 1 |
| 1. Harbin Institute of Technology, Harbin 150001, China;
2. Ultra-Precision Machining Center, Zhejiang University of Technology, Hangzhou 310014, China |
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Abstract Sapphire complex surface optical components are extensively utilized in high-end technology and aerospace fields due to their excellent mechanical and optical properties, while the high hardness and brittleness of sapphire and the high precision requirements of complex surfaces pose great challenges to optical fabrication capabilities. The research status of grinding mechanism and key manufacturing technology of sapphire complex surface optical components were reported. Firstly, the sapphire grinding mechanism was described in terms of sapphire material properties, surface subsurface damage, tool and tool wear, energy field assistance and residual stress, then the ultra-precision grinding processing technology of deep conformal rectifier and aspheric optical components of sapphire were investigated, and finally the key technology of sapphire free-form surface ultra-precision grinding processing was summarized and prospected.
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2022, 
