Time and Frequency Dependence of Stimulated Thermal Rayleigh Scattering

Theoretical investigations of the transient light amplification of stimulated thermal Rayleigh scattering predict a gain proportional to $t^2$ and, most interesting, a gain at $\omega ={\omega }_L-{\omega }_S=0\mathrm{}$ (${\omega }_L$ and ${\omega }_S$ are the laser and signal frequency, respectively). Experimental investigations using a light amplifier with high-frequency resolution ($\frac{\omega }{{\omega }_L}\simeq {10}^{-8\mathrm{}}$) confirm our calculations.