Share Email Print
cover

Proceedings Paper

Research of controlling the optical face of CaF2 crystal elements on optical grinding and polishing
Author(s): Zhigang Li; Zhongwen Lu; Heng Zhu; Yunti Pu; Zhengjun Bao; Ping Ma
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

As an excellent optical element material, CaF2 crystal has a wide-spectrum transmission range and stable physicochemical properties. Due to the soft and brittle nature of CaF2 crystal, also with high coefficient of thermal expansion and low heat conductivity coefficient, it is of great significance to study the stability and characterization of the removal function during the processing of large-diameter CaF2 optical elements with specific geometric requirements. In this paper, a Φ200 mm CaF2 crystal plate was taken as the research object. The stable technique of grinding and polishing calcium fluoride is researched and the pressure is treated as the key factor. The specialized tool is designed to control the pressure. The removal model of grinding and polishing is stablished based on the specialized tool. The pressure distribution of grinding and polishing process is simulated and the optimized pressure distribution is obtained. This makes the whole face error converged efficiently and stably, meanwhile the face to face angle can be controlled precisely. As a conclusion, the PV value of experimental element is less than 0.13λ within the aperture, and the face to face angle is restrained into 5″ after using new tools.

Paper Details

Date Published: 12 December 2018
PDF: 6 pages
Proc. SPIE 10847, Optical Precision Manufacturing, Testing, and Applications, 108470R (12 December 2018); doi: 10.1117/12.2505488
Show Author Affiliations
Zhigang Li, Fine Optical Engineering Research Ctr. (China)
Zhongwen Lu, Fine Optical Engineering Research Ctr. (China)
Heng Zhu, Fine Optical Engineering Research Ctr. (China)
Yunti Pu, Fine Optical Engineering Research Ctr. (China)
Zhengjun Bao, Fine Optical Engineering Research Ctr. (China)
Ping Ma, Fine Optical Engineering Research Ctr. (China)


Published in SPIE Proceedings Vol. 10847:
Optical Precision Manufacturing, Testing, and Applications
John McBride; JiuBin Tan; Sen Han; Xuejun Zhang, Editor(s)

© SPIE. Terms of Use
Back to Top