Abstract
It was shown theoretically that the use of a nonlinearly absorbing cell inside the resonator of a laser leads to a reduction in the width of the laser emission line by a factor of S in the case when apparatus-induced fluctuations are dominant, and by a factor of S2 for the case of natural fluctuations (S is the autostabilization factor). It was established experimentally that S reaches a value of ~ 25 in an injection laser with a nonlinearly absorbing cell containing cesium vapor, and that this enables one to improve substantially the monochromaticity of the radiation from injection lasers without increasing their dimensions.
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