The intracavity generation of the second harmonic makes it possible to substantially improve the amplitude-frequency characteristics of a solid-state ring laser operating in the active mode-locking regime: to eliminate the competitive suppression of counterrunning waves, to extend the region of the beating regime, and to remove anomalies in the frequency characteristic, which are typical of the free running laser mode. The effect of the loss modulation frequency on the width of the mode-coupling region and the beat frequency is analyzed.
Department of Optics and Spectroscopy, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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