Abstract

The beat frequencies between modes of an optical resonator with concave mirrors have been studied by the photomixing technique. Lasers operating on the 6328 Å He–Ne transition were used. The results agree well with theory. Removal of degeneracy by resonator irregularities and mode repulsion effects have been observed. The technique of partially blocking the external laser beam in order to observe all the beat frequencies is pointed out.

© 1964 Optical Society of America

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