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Proceedings Paper

Testing aspherics without rotational symmetry using a Fizeau interferometer with computer-generated holograms
Author(s): Tilo Pfeifer; Jens Evertz; Rainer Tutsch; Hendrik Rothe
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Paper Abstract

Non-rotational aspherics offer new perspectives for the development of new concepts for high power laser resonators (e.g., CO2-laser with unstable resonator). Furthermore, the intensity profile of the laser beam can be adapted to the needs of special working processes (e.g., cutting, welding, surface treatments). At the IPT a variety of mirrors with complex shapes are manufactured with a proprietary fast-tool-servo on a diamond turning lathe. For these mirrors an aspheric testing interferometer with computer generated holograms has been developed. Research work was done on the design of the optical system, the development of algorithms and software for the computation of the holograms, the techniques for manufacturing the computer generated holograms (CGH) and an appropriate strategy for adjustment of the measurement system. The hologram pattern is plotted using a CAD-plotter and photographically reduced in scale. To overcome this time-consuming technique and to improve the precision of the holograms a laser-based direct writing hologram-plotter is under development. We describe the concept of the measurement system, and discuss several systematic error sources. Some recent results are presented.

Paper Details

Date Published: 1 January 1993
PDF: 8 pages
Proc. SPIE 1781, Specification and Measurement of Optical Systems, (1 January 1993); doi: 10.1117/12.140972
Show Author Affiliations
Tilo Pfeifer, Fraunhofer Institut fuer Produktionstechnologie (Germany)
Jens Evertz, Fraunhofer Institut fuer Produktionstechnologie (Germany)
Rainer Tutsch, Fraunhofer Institut fuer Produktionstechnologie (Germany)
Hendrik Rothe, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 1781:
Specification and Measurement of Optical Systems
Lionel R. Baker, Editor(s)

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