Abstract
The time variations of Fabry–Perot interference fringes produced by the coherent light from a ruby laser have been recorded with an image converter camera. The recorded variations indicate that: (a) the mode of oscillation of the ruby can change from one relaxation–oscillation burst of emission, or laser spike, to another; (b) a monotonic progression of wavelengths frequently occurs in a sequence of spikes; (c) the oscillation mode can switch within a single spike; and (d) several modes of oscillation can occur simultaneously in a single spike. The multiplicity of modes was observed to increase with an increase of pumping power. The wavelength separation between simultaneous modes corresponds closely to an integral difference in the number of half-wavelengths between the silvered end faces of the ruby.
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