We have studied the nonlinear Faraday effect of intense linear polarized light in an optically
thick atomic rubidium vapor. We have shown that the polarization rotatation rate (rotation
angle per unit magnetic field, in the limit of low field) reaches a saturation value as the intensity
and density are increased.
We have experimentally demonstrated anomalous stimulated scattering of sound waves with optical waves of the same direction in a cell of Rb vapor. The optical wave is propagating under the conditions for ultra-slow group velocity. The phase-matching condition for the interaction of the waves is achieved when the group velocity of the probe field to approximately the speed of the sound wave.
Two experiments in which laser oscillation without population inversion was obtained for the first time are reported. Analytical solutions are presented to elucidate the principles of the experiments. Numerical simulations and experimental results in a Rb vapor cell and a Na atomic beam for the gain profile are compared.
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