Grinding and polishing technology by computer controlled active lap for Φ1250mmF/1.5 aspheric mirror
2010
For large aspheric optical elements, Computer Controlled Active Lap(CCAL) manufacturing which developed in IOE
(Institute of Optics and Electronics, Chinese Academy of Science), have some advantages such as higher manufacturing
efficiency, lower middle-frequency and high-frequency errors comparing the fixed lapping technology and
CCOS(Computer Controlled Optical Surface) technology. A paraboloid surface of Φ1250mmF/1.5 was grinded by the
active lap bonded with ceramic pills, as well as polished will pitch bonded active lap. During polishing processing a null
lens was designed to test the paraboloid surface, the final testing data of RMS with ZYGO interferometer reached to
0.027λ(λ=0.6328μm).
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