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Sinusoidal self-modulation in the output of a CO2 laser with an intracavity saturable absorber

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Abstract

Conditions under which a sinusoidally modulated laser output occurs in a CO2 laser with a saturable absorber were studied experimentally and theoretically for a wide range of laser operating parameters. A novel type of transition between stability and instability appears in the high-pressure range of the saturable absorber. Through the rate-equation analysis based on the three-level (the gain medium)–two-level (the loss medium) model, the observed pulse shapes and the features of transitions in the phase diagram are reproducible. The conditions of saturable absorbers to obtain the sinusoidal modulation are clarified from the analysis.

© 1988 Optical Society of America

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