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Proceedings Article

Testing of a diamond-turned off-axis parabolic mirror

[+] Author Affiliations
Jan Burke

CSIRO Materials Science and Engineering-Australian Ctr. for Precision Optics (Australia)

Kai Wang, Adam Bramble

Macquarie Univ. (Australia)

Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 706312 (August 11, 2008); doi:10.1117/12.793510
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From Conference Volume 7063

  • Interferometry XIV: Techniques and Analysis
  • Joanna Schmit; Katherine Creath; Catherine E. Towers
  • San Diego, California, USA | August 10, 2008

abstract

Methods to test on-axis and off-axis parabolic mirrors are standard textbook fare. All we need, we are told, is a spherical wavefront and a plane mirror, or a plane wavefront and a spherical mirror. Contrasting with the implied ease of application, reports on practical experience with these tests are somewhat rare, particularly for off-axis mirrors. We have explored both variations of this testing method with a phase-shifting Fizeau interferometer, auxiliary components, and a one-inch diamond-turned 90° off-axis commercial-quality parabolic test mirror. The testing process is quick and easy only if you know how, and frustrating and time-consuming otherwise. We report on the calibration of the reference surfaces, present a detailed and systematic re-appraisal of the necessary steps for alignment and measurement validation, which have been described previously but in a less straightforward way, and present a brief characterization of the parabolic mirror that gives some insight into the diamond-turning process.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Jan Burke ; Kai Wang and Adam Bramble
"Testing of a diamond-turned off-axis parabolic mirror", Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 706312 (August 11, 2008); doi:10.1117/12.793510; http://dx.doi.org/10.1117/12.793510


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