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OptSp

Strong field, resonances, and spontaneous transitions in an atom: two-, three-, and four-level systems

I. V. Lebedev

Published Feb 1, 1981• 0 citations
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Two-Level Atoms and Spontaneous Emission

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The splitting of the line of resonance scattered light from atomic systems, being a mong the most interesting phenomena in resonance nonlinear optics has received considerable attention during the past decade [1–11]. It is known by now that the number of lines into which the spontaneous scattered light spectrum splits, grows up with increasing the number N of strongly coupled atomic (or molecular) levels as N(N-1)+1 [10, 11]. But while the character of resonance fluorescence (RF) from a two- and three-level systems has been extensively studied [1–91], the number of papers devoted to the spectral structure of scattered light from systems with N>3 is scarce. In reality there is only one work [12], known to us, which treat s certain aspects of the spectrum of RF from a four-level system irradiated by three strong light fields at exact resonance.
An analysis is made of the interaction of a three-level cascade atomic system with a resonant laser field. An investigation is made of the dynamics of the populations of the quasienergy states and of the atomic levels over times greater than the spontaneous transition times. In the steady-state regime the distribution of atoms over various quasienergy states is obtained under two-photon resonance conditions and for the case when all the resonances are strong. It is found that a suitable selection of the interaction parameters can establish an inversion between the quasienergy states and also due to atomic transitions. The total probability of spontaneous scattering is calculated. It is shown that, under two-photon resonance conditions, the scattering intensity increases sharply due to a self-induced resonance.