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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 5 — Feb. 10, 2009
  • pp: 1008–1015

Quantitative evaluation of an off-axis parabolic mirror by using a tilted null screen

Maximino Avendaño-Alejo, Victor I. Moreno-Oliva, Manuel Campos-García, and Rufino Díaz-Uribe  »View Author Affiliations

Applied Optics, Vol. 48, Issue 5, pp. 1008-1015 (2009)

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We report the testing of a fast off-axis surface based on the null screen principles. Here we design a tilted null screen with drop shaped spots drawn on it in such a way that its image, which is formed by reflection on the test surface, becomes an exact square array of circular spots if the surface is perfect. Any departure from this geometry is indicative of defects on the surface. Here the whole surface is tested at once. The test surface has a radius of curvature of r = 20.4 mm ( F / 0.206 ). The surface departures from the best surface fit are shown; in addition, we show that the errors in the surface shape are below 0.4 μm when the errors in the determination of the coordinates of the centroids of the reflected images are less than 1 pixel, and the errors in the coordinates of the spots of the null screen are less than 0.5 mm .

© 2009 Optical Society of America

OCIS Codes
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(220.1250) Optical design and fabrication : Aspherics
(220.4840) Optical design and fabrication : Testing

ToC Category:
Optical Design and Fabrication

Original Manuscript: November 11, 2008
Manuscript Accepted: December 31, 2008
Published: February 9, 2009

Maximino Avendaño-Alejo, Victor I. Moreno-Oliva, Manuel Campos-García, and Rufino Díaz-Uribe, "Quantitative evaluation of an off-axis parabolic mirror by using a tilted null screen," Appl. Opt. 48, 1008-1015 (2009)

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