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Proceedings Paper

New design techniques and calibration methods for CGH-null testing of aspheric surfaces
Author(s): Stephan Reichelt; Christof Pruss; Hans J. Tiziani
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Paper Abstract

The entire process of designing the test setup with a computer-generated hologram (CGH) and performing the CGH-null test of an asphere will be described in detail. Critical aspects in testing aspherics with CGH-nulls e.g. caustic of the asphere, influence of alignment errors, lateral distortion and lateral resolution of the measurement are discussed. Detection, specification and calibration methods of fabrication errors of the CGH-null are analyzed with respect to the fabrication technology of the CGH. For a high accuracy CGH-null test of an asphere, the errors of the CGH must be negligible or well calibrated. Techniques to calibrate the systematic error of the test setup are presented with examples. Experimental results of interferometric CGH-null tests of an asphere are presented.

Paper Details

Date Published: 19 June 2002
PDF: 11 pages
Proc. SPIE 4778, Interferometry XI: Applications, (19 June 2002); doi: 10.1117/12.473562
Show Author Affiliations
Stephan Reichelt, Univ. Stuttgart (Germany)
Christof Pruss, Univ. Stuttgart (United States)
Hans J. Tiziani, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 4778:
Interferometry XI: Applications
Wolfgang Osten, Editor(s)

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