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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 28 — Oct. 1, 2011
  • pp: 5473–5483

Flexible null test for form measurement of highly astigmatic surfaces

Stephen Rolt and Andrew Kirby  »View Author Affiliations

Applied Optics, Vol. 50, Issue 28, pp. 5473-5483 (2011)

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We report the application of interferometry to the form measurement of a family of highly astigmatic optical surfaces. These measurements are based on a null test that employs a double-pass off-axis test arrangement with a tilted test surface and a reference sphere. This arrangement provides a perfect null test for an ellipsoid of revolution, or prolate spheroid. Its application is illustrated in detail in the presentation of results for the measurement of a specific family of eight differing surfaces that are incorporated into the K-Band Multi-Object Spectrometer Integral Field Unit. All surfaces measured here are sufficiently close to a prolate spheroid to justify its practical application. We discuss the application of the technique as a flexible low-cost approach for the generation of null interferograms in the measurement of a variety of complex surfaces.

© 2011 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(350.1260) Other areas of optics : Astronomical optics

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 3, 2011
Revised Manuscript: July 5, 2011
Manuscript Accepted: August 19, 2011
Published: September 30, 2011

Stephen Rolt and Andrew Kirby, "Flexible null test for form measurement of highly astigmatic surfaces," Appl. Opt. 50, 5473-5483 (2011)

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