1 October 1976 Laser Beam Divergence in Short Interferometers
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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.
W. S. Radcliffe, "Laser Beam Divergence in Short Interferometers," Optical Engineering 15(5), 155478 (1 October 1976). https://doi.org/10.1117/12.7972026 . Submission:


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