Abstract
The output of a multimode cw Rh6G laser has been frequency-shifted by reflection from a moving mirror and used as a weak additional feedback to the laser for the experimental simulation of Rayleigh scattering inside the laser cavity. Reduced sensitivity of the laser spectrum to intracavity absorption has been observed, as well as increase of the laser bandwidth and of the emission bandwidth of individual longitudional modes. The effect of the frequency-shifted feedback on the laser dynamics is shown not to depend on the pump rate. The effect of both nonlinear mode coupling and Rayleigh scattering on laser spectral dynamics has been determined from a model and from the measurements. The product of spectral saturation time and emission bandwidth of a laser mode is found constant. Rayleigh scattering seems to be the principal mechanism governing the spectral dynamics and determining the stationary bandwidth of the modes in solid-state lasers.
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