Abstract

It is shown that the dependence of relaxational processes on radiation intensity associated with the finiteness of correlation time τc of relaxational perturbations is to a great extent defined by the statistics of these perturbations. Generalized master equations (GME’s) that take into account the nonvanishing correlation time τc are obtained by using the characteristic operator method. With the Gaussian statistics assumption for adiabatic perturbations causing a stochastic transition-frequency modulation, these GME’s are used to reveal the main features of the free-induction-decay rate dependence on radiation power. Good agreement with the experiment of DeVoe and Brewer [ Phys. Rev. Lett. 50, 1263 ( 1983)] is obtained. Our preceding theory [ Opt. Commun. 52, 279 ( 1984)] based on the correlation (Born) approximation closely agrees with the results of this paper at τc/T2 ≪ 1 and T1/T2 < 3.67.

© 1986 Optical Society of America

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