Abstract

The number and relative power of simultaneously oscillating modes in 6328-Å He–Ne optical gas masers (lasers) were measured by means of a technique utilizing Fabry–Perot interferometers. In one case 28 dominant modes spanning a frequency range of 1080 Mc/sec out of the 1500 Mc/sec half-width of the 6328-Å Ne line were found. The relative amplitudes of the modes can be fitted generally to a Gaussian-shaped curve. The technique, which utilizes a scanning Fabry–Perot, is described and discussed.

© 1964 Optical Society of America

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