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Journal of Experimental and Theoretical Physics

Resonant cooperative scattering of light in field-induced splitting of atomic levels

Sergey G. Rautian, B. M. Chernobrod

Published Apr 1, 1980• 0 citations
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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.

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智 藤井, 敏雄 伊東

•Feb 28, 1982•0 citations
A set of coupled equations for the particle scattering by a two level atom in a strong near resonant radiation field is derived from the time dependent Schrodinger equation. This set of equations is discussed in a first and second order approximation. The result can be visualized in terms of a scheme in which the two well separated (nondegenerate) atomic states split, each into two energy levels. The splitting depends on the strength of the field and on the difference between the resonance frequency and the frequency of the incident light and is typically a few meV. In this scheme all possible elastic, quasielastic, inelastic and superelastic transitions between the four levels can be induced by collision processes. In addition, multiphoton processes may occur if the scattered particle remains long enough in the interaction region. Estimates of the two photon gain process for electron and heavy particle scattering by sodium atoms in a dye laser field are given. It is suggested that the superelastic processes may play an important role in laser induced gas breakdown, even if the laser frequency does not coincide with any atomic transition. Spontaneous emission of atoms in laser fields is also treated. The results are similar to the particle scattering processes.
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.