Abstract

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

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References

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    [CrossRef]
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Appl. Opt.

J. Opt. Soc. Am.

Key Eng. Mater.

H. S. Yang, S. W. Kim, and D. D. Walker, �??A novel profilometer for nanometric form assessment for large machined surfaces,�?? Key Eng. Mater. 257, 225-230 (2004).

Proc. SPIE

J. Burge, �??A null test for null correctors: error analysis, �?? in Quality and Reliability for Optical Systems, J. W. Bilbro and R. E. Parks, eds., Proc. SPIE 1993, 86-97 (1993).

Sov. J. Opt. Technol.

V. A. Zverev, S. A. Rodionov, M. N. Sokol'skii, and V. V. Usoskin, �??Testing of the primary mirror of the LAT (Large Azimuthal Telescope) by the Hartmann method during its manufacture, �?? Sov. J. Opt. Technol. 44, 127-129 (1977).

Other

D. Malacara, Optical Shop Testing (Wiley, New York, 1992), Chap. 10.

CELT, The California Extremely Large Telescope, <a href= "http://celt.ucolick.org/">http://celt.ucolick.org/</a>.

NPL, NPL, and EURO 50 telescope, <a href= "http://www.npl.co.uk/length/dmet/euro50.html">http://www.npl.co.uk/length/dmet/euro50.html</a>.

OWL, 100-m OWL telescope concept, <a href= "http://www.eso.org/projects/owl/owl_design.html">http://www.eso.org/projects/owl/owl_design.html</a>.

W. J. Smith, Modern Optical Engineering (McGraw-Hill, New York, 1990), Chap. 4.

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