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Optical Engineering

Evaluation of Expanded Laser Beams Using an Optical Flat
Author(s): M. Lurie
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Paper Abstract

The curvature of a nearly plane wavefront can be detected in a shearing interferometer, in which one portion of the amplitude of a wavefront is made to interfere with another portion that has been shifted transversely, or sheared. When used with laser light having a high degree of spatial and temporal coherence, a shearing interferometer may consist of simply an optical-flat held at an angle to the illuminating wavefront so that reflections from the front and back surfaces interfere, as in Fig. 1. This provides an extremely simple tool for checking the adjustment and quality of laser beam expanders. The technique is of sufficient practical value to warrant a description of the simple theory and application.

Paper Details

Date Published: 1 February 1976
PDF: 2 pages
Opt. Eng. 15(1) doi: 10.1117/12.7971912
Published in: Optical Engineering Volume 15, Issue 1
Show Author Affiliations
M. Lurie, RCA Laboratories (United States)


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