Process optimization for polishing large aspheric mirrors

James H. Burge; Dae Wook Kim; Hubert M. Martin

doi:10.1117/12.2057727

28 July 2014 Process optimization for polishing large aspheric mirrors

James H. Burge, Dae Wook Kim, Hubert M. Martin

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91512R (2014) https://doi.org/10.1117/12.2057727
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Large telescope mirrors have stringent requirements for surface irregularity on all spatial scales. Large scale errors, typically represented with Zernike polynomials, are relatively easy to control. Errors with smaller spatial scale can be more difficult because the specifications are tighter. Small scale errors are controlled with a combination of natural smoothing from large tools and directed figuring with precisely controlled small tools. The optimization of the complete process builds on the quantitative understanding of natural smoothing, convergence of small tool polishing, and confidence in the surface measurements. This paper provides parametric models for smoothing and directed figuring that can be used to optimize the manufacturing process.

Citation Download Citation

James H. Burge, Dae Wook Kim, and Hubert M. Martin "Process optimization for polishing large aspheric mirrors", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512R (28 July 2014); https://doi.org/10.1117/12.2057727

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