Abstract
Since mid-1990 several W.M. Keck 10 meter Telescope primary mirror segments have been final figured using the ion beam figuring process. This optical fabrication technique uses a neutral ion beam to remove residual surface figure errors after the polishing process has been completed. The initial surface figure errors for the primary mirror segments have ranged from 0.090 to 0.350 µm rms; after a single ion figuring process correction cycle the errors have been reduced to 0.025 to 0.090 µm rms. The process and approach used, along with recent processing results will be discussed.
© 1992 Optical Society of America
PDF ArticleMore Like This
Kris W. Johnson and Thomas G. Pitts
ThA1 Optical Fabrication and Testing (OF&T) 1992
Bobby Ulich, Anthony Gleckler, Gregory Ames, David Markason, and Skip Radau
AWC1 Adaptive Optics for Large Telescopes (AOLT) 1992
Gary A. Chanan
ThA3 Optical Fabrication and Testing (OF&T) 1992