Share Email Print

Optical Engineering

Computer-generated holograms in interferometric testing
Author(s): Christof Pruss; Stephan Reichelt; Hans J. Tiziani; Wolfgang Osten
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Computer-generated holograms (CGH) are on their way to becoming a state-of-the-art component in interferometry. We give an overview on recent developments in calibration and testing of aspheric surfaces with CGH. The starting point is a new absolute calibration method for binary Fresnel zone mirrors (FZM) that allows separation of the errors introduced by the imperfectly written FZM pattern from the errors of the substrate and from the interferometer errors. This leads to a variety of applications for FZM, ranging from absolutely calibrated spherical master surfaces to quality control of CGH fabrication. We then focus on a major application of binary CGH: null tests for testing of aspheric surfaces. Useful test setups are described and an alignment strategy utilizing auxiliary structures in the periphery of the CGH is discussed. The section on binary CGH culminates with the first absolute test method for measuring aspheric surfaces and systems. We close our overview with diffractive transmission spheres. Diffractive transmission spheres offer high accuracy of the generated wavefront, low weight, and new alignment possibilities with the help of flexible auxiliary structures. They are fabricated in a grayscale technique that provides high-efficiency blazed structures. Prototypes are shown and measurement results are given.

Paper Details

Date Published: 1 November 2004
PDF: 7 pages
Opt. Eng. 43(11) doi: 10.1117/1.1804544
Published in: Optical Engineering Volume 43, Issue 11
Show Author Affiliations
Christof Pruss, Univ. Stuttgart (Germany)
Stephan Reichelt, Albert-Ludwigs-Univ. Freiburg (Germany)
Hans J. Tiziani, Univ. Stuttgart (Germany)
Wolfgang Osten, Univ. Stuttgart (Germany)

© SPIE. Terms of Use
Back to Top