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Proceedings Article

Measurement of aspheric mirror segments using Fizeau interferometry with CGH correction

[+] Author Affiliations
James H. Burge, Chunyu Zhao, Matt Dubin

College of Optical Sciences, The Univ. of Arizona (USA)

Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 773902 (July 19, 2010); doi:10.1117/12.857816
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From Conference Volume 7739

  • Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
  • San Diego, California, USA | June 27, 2010

abstract

Large aspheric primary mirrors are proposed that use hundreds segments that all must be aligned and phased to approximate the desired continuous mirror. We present a method of measuring these concave segments with a Fizeau interferometer where a spherical convex reference surface is held a few millimeters from the aspheric segment. The aspheric shape is accommodated by a small computer generated hologram (CGH). Different segments are measured by replacing the CGH. As a Fizeau test, nearly all of the optical elements and air spaces are common to both the measurement and reference wavefront, so the sensitivities are not tight. Also, since the reference surface of the test plate is common to all tests, this system achieves excellent control for the radius of curvature variation from one part to another. This paper describes the test system design and analysis for such a test, and presents data from a similar 1.4-m test performed at the University of Arizona.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

James H. Burge ; Chunyu Zhao and Matt Dubin
"Measurement of aspheric mirror segments using Fizeau interferometry with CGH correction", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 773902 (July 19, 2010); doi:10.1117/12.857816; http://dx.doi.org/10.1117/12.857816


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