Measurement of large optical surfaces for fabrication using a nonoptical technique

Robert S. Breidenthal

doi:10.1117/12.58047

26 March 1992 Measurement of large optical surfaces for fabrication using a nonoptical technique

Robert S. Breidenthal

Proceedings Volume 1618, Large Optics II; (1992) https://doi.org/10.1117/12.58047
Event: Optics Rochester: SPIE's International Symposium on Imaging, Fabrication, and Competitiveness, 1991, Rochester, NY, United States

Abstract

A ten meter astronomical telescope is being constructed using a phased array of two meter segments. This requires manufacture of a large number of off-axis segments and emphasizes the desirability of rapid manufacture and smoothness of finish of the segments. These two requirements have been met at Itek by combining surface figure measurement of a mirror using a multiple probe mechanical bar profilometer and fabrication of that mirror by stressed mirror polishing. Through the use of the multiple probe bar profilometer, a mirror segment can be measured to an accuracy of 0.047 microns rms surface error in a period of less than 90 minutes, including data processing time. This test has allowed us to manufacture 12 off-axis segments with a final surface error, after low-order correction by the in-use mount, of approximately .02 microns rms. The average rate for the entire grind and polish fabrication cycle is six weeks per mirror

Citation Download Citation

Robert S. Breidenthal "Measurement of large optical surfaces for fabrication using a nonoptical technique", Proc. SPIE 1618, Large Optics II, (26 March 1992); https://doi.org/10.1117/12.58047

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