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Proceedings Paper

Point-Diffraction Interferometry As A Diagnostic For Alignment
Author(s): Raymond N. Smartt
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Paper Abstract

The Point-Diffraction Interferometer (PDI) forms a spherical reference wavefront at the image of a point source, as produced by some optical system under test, by diffraction at a point-like discontinuity. The reference wavefront interferes with the directly transmitted light, forming an interference pattern that represents a direct and accurate measure of the wavefront aberration. Fringe visibility can approach unity by appropriate design of the interferometer. These principles and performance characteristics are briefly reviewed. By virtue of its operation, the PDI provides precise information about the location of an image relative to the interferometer aperture, with measurement precision intrinsic to two-beam interferometry. It is shown that high internal and external alignment precision of an optical system is possible using a PDI.

Paper Details

Date Published: 13 August 1984
PDF: 6 pages
Proc. SPIE 0483, Optical Alignment II, (13 August 1984); doi: 10.1117/12.943125
Show Author Affiliations
Raymond N. Smartt, National Optical Astronomy Observatories (United States)


Published in SPIE Proceedings Vol. 0483:
Optical Alignment II
Mitchell C. Ruda, Editor(s)

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