Computer-controlled optical surfacing for off-axis aspheric mirrors

Jerrold Zimmerman

doi:10.1117/12.19182

1 July 1990 Computer-controlled optical surfacing for off-axis aspheric mirrors

Jerrold Zimmerman

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19182
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

A computer-controlled optical surface (CCOS) process has been developed that is in routine use for fabricating off-axis and centered aspheric mirrors. The CCOS process effects surface removal by moving a relatively small tool over the mirror surface in a path covering the entire surface. The removal is computed by the convolution of the tool work function with the path of the tool over the mirror surface. The combination of CCOS with microgrinding (grinding with fine tool over the mirror surface. The combination of CCOS with microgrinding (grinding with fine diamond powders which produce a specular surface) allows interferometric testing at an early stage of the process. Surface figure accuracies better than 20 nm rms and finishes better than 10 A are currently achieved.

Citation Download Citation

Jerrold Zimmerman "Computer-controlled optical surfacing for off-axis aspheric mirrors", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19182

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