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Proceedings Paper

Testing of a diamond-turned off-axis parabolic mirror
Author(s): Jan Burke; Kai Wang; Adam Bramble
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Paper 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.

Paper Details

Date Published: 11 August 2008
PDF: 16 pages
Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 706312 (11 August 2008); doi: 10.1117/12.793510
Show Author Affiliations
Jan Burke, CSIRO Materials Science and Engineering-Australian Ctr. for Precision Optics (Australia)
Kai Wang, Macquarie Univ. (Australia)
Adam Bramble, Macquarie Univ. (Australia)

Published in SPIE Proceedings Vol. 7063:
Interferometry XIV: Techniques and Analysis
Joanna Schmit; Katherine Creath; Catherine E. Towers, Editor(s)

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