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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 6 — Mar. 21, 2005
  • pp: 1839–1847

Null Hartmann test for the fabrication of large aspheric surfaces

Ho-Soon Yang, Yun-Woo Lee, Jae-Bong Song, and In-Won Lee  »View Author Affiliations

Optics Express, Vol. 13, Issue 6, pp. 1839-1847 (2005)

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Most aspheric mirrors have been tested by the null lens or computer-generated hologram method. This approach, however, requires that the shape of the surface be similar to the target shape; otherwise testing may not be possible or correct. The Hartmann test has an advantage in that it has a larger dynamic range than a general interferometer, which means that the surface can be tested beginning at an early stage of the polishing process. We suggest use of the null Hartmann test in conjunction with a phase-shifting interferometer for the measurement of a 0.9-m aspheric concave mirror. This setup was able to measure the surface with a large surface form error as well as with a small error without sacrificing any measurement accuracy. Using this setup, we have successfully polished a surface to remove approximately 1 µm of peak-to-valley wave-front error of a total of 39 µm of error during 1 month of polishing.

© 2005 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure

ToC Category:
Research Papers

Original Manuscript: January 27, 2005
Revised Manuscript: February 21, 2005
Published: March 21, 2005

Ho-Soon Yang, Yun-Woo Lee, Jae-Bong Song, and In-Won Lee, "Null Hartmann test for the fabrication process of large aspheric surfaces," Opt. Express 13, 1839-1847 (2005)

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