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Proceedings Paper

Tandem shearing interferometer with large shears for complete wavefront reconstruction
Author(s): Stefan Loheide; Michael Schulz
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Paper Abstract

A shearing interferometer unit is proposed, which is capable of gathering the complete information about a wavefront by recording a single interferogram and which consists of a combination of two conventional shearing interferometers. With its capabilities it is predestined to be used as a tool for accurate measurements because it can be built as a solid unit without moving parts. This aim will be supported by a new method for quantitatively determining the shape of a wavefront from the difference between the wavefront and a laterally sheared copy which allows experiments to be performed with shears up to 20 percent of the width of the aperture. The method is based on filtering of the wavefront difference in the frequency domain with a transfer function specifically determined for this purpose. A novel window function is used to deal with the influence of the edge of the pupil. This method hardly requires any a priori information about the shape of the wavefront to be calculated. Furthermore, it leads to accurate results with high lateral resolution, reconstructs the information inside the whole aperture, and requires a much lesser computational effort than procedures hitherto known.

Paper Details

Date Published: 1 November 1997
PDF: 10 pages
Proc. SPIE 3134, Optical Manufacturing and Testing II, (1 November 1997); doi: 10.1117/12.279131
Show Author Affiliations
Stefan Loheide, Physikalisch-Technische Bundesanstalt (Germany)
Michael Schulz, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 3134:
Optical Manufacturing and Testing II
H. Philip Stahl, Editor(s)

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