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Optical Engineering

Laser Beam Divergence in Short Interferometers
Author(s): W. S. Radcliffe
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Paper Abstract

The initial investigations of laser performance with short interferometers at RCA were performed with an electro-optic Q-Switch. These results showed that beam divergences of one to two milliradians were easily achieved with an interferometer length of about 2.5 inches. However when the dye Q-Switch was substituted for an electro-optic switch,1 and the interferometer shortened to 2.0 inches, the beam divergence increased to six milliradians or larger. Many tests were run with the 2.0 inch interferometer because it was found that the divergence varied with the quality of the Q-Switch material. The best that was achieved was five milliradians, independent of optical density or quality of the Q-Switch used. In all these tests the interferometer consisted of a 4mm x 40mm neodynium doped Y.A.G. laser rod and a flat 100% mirror that could be moved to vary the interferometer length.

Paper Details

Date Published: 1 October 1976
PDF: 1 pages
Opt. Eng. 15(5) doi: 10.1117/12.7972026
Published in: Optical Engineering Volume 15, Issue 5
Show Author Affiliations
W. S. Radcliffe, RCA (United States)


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