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Proceedings Paper

Application of SLMs for optical metrology
Author(s): Hans J. Tiziani; Tobias Haist; J. Liesener; M. Reicherter; L. Seifert
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Paper Abstract

For wavefront sensing, wavefront shaping, and optical filtering, spatial light modulators can be very useful. With the availability of high resolution liquid crystals (LC) spatial phase modulators and micromechanical systems (MEMS) containing large arrays of micromirrors, new applications in optical metrology become possible. For wavefront analysis and correction, dynamic CGHs are used. A correction hologram for the aberrated system is computed from which the lens shape can be derived. For Hartmann sensors, usually static microlenses are used. It was found advantageous to generate dynamic microlenses in order to correct for local wavefront aberrations. Optically addressed spatial light modulators can be applied very effectively for the characterisation and defect analysis of primarily periodic structures such as microchips or microlens arrays. For triangulation based methods, better results can be obtained by adapting the projected fringes to the object in terms of shape and brightness. Examples and experimental results are discussed.

Paper Details

Date Published: 8 November 2001
PDF: 10 pages
Proc. SPIE 4457, Spatial Light Modulators: Technology and Applications, (8 November 2001); doi: 10.1117/12.447740
Show Author Affiliations
Hans J. Tiziani, Univ. Stuttgart (Germany)
Tobias Haist, Univ. Stuttgart (Germany)
J. Liesener, Univ. Stuttgart (Germany)
M. Reicherter, Univ. Stuttgart (Germany)
L. Seifert, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 4457:
Spatial Light Modulators: Technology and Applications
Uzi Efron, Editor(s)

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