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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Stimulated Raman light scattering by an atom near a macroscopic body with spectral peculiarities

Gennadiy Nikolaev, Oleg Uuemaa

Published May 20, 1996• 0 citations
Publisher

Abstract

Stimulated Raman light scattering by an atom near a macroscopic body with spectral peculiarities in the vicinity of the atomic resonance frequency is theoretically investigated. It is shown that the stimulated Raman light scattering by an atom under these conditions essentially differs from that in free space.
DOI
10.1117/12.240531

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Two-photon light absorption by an atom situated near to surface of a solid with spectral features in the vicinity of resonance frequencies of transitions of atoms is theoretically investigated. These features can be caused, for example, polariton or exiton resonance of a solid. It is shown, that the two-photon light absorption an atom situated near to surface can essentially differ from those in a free space. The spectrum of a two-photon absorption becomes asymmetric over the difference between exciting light frequency and resonant transition frequency of the atom. It is established, that even small spectral features of solid can give rise to significant changes of a spectrum of a two-photon absorption of light. It is established also, that such changes of a spectrum of a two- photon absorption of light are nonlinear increased with increase of the intensity of the exciting light and with approach of the atom to the surface of solid.
The review deals with various variants of classification of the types of secondary emission of light by molecules; cases are distinguished in which the secondary emission occurs without additional processes that find their way between photon emission and absorption; the advisability of differentiating between the cases of resonance fluorescence and resonance scattering is noted. Reference is made to papers that have made contributions to the development of quantum-mechanical and classical theory of Raman scattering and to the development of the concepts of the relations between electron-vibrational absorption spectra, fluorescence spectra, and scattering excitation near and near and far resonance. Conditions are considered of excitation of the spectrum at different relations between the electronic-oscillator damping constant, the atom vibration frequency, the rotational frequencies, and the difference between the frequency of the incident light and the frequency of the electronic transition. The conditions for the excitation of typical light scattering, typical resonance fluorescence, and certain intermediate types, in which individual features of scattering are combined with certain features of fluorescence (phenomena of the transition type) are noted. The results of investigations of different models of the scattering centers, their advantages, shortcomings, and limits of applicability are compared. The most interesting results of the experimental investigations of resonant scattering of light by molecules and crystals are noted.
An analysis is made of the propagation of a short coherent optical pulse in a three-level resonant medium with an essentially nonequidistant spectrum as a function of the degree of preexcitation of the medium. It is found that in addition to self-induced transparency and resonance scattering, stimulated Raman scattering (Stokes or anti-Stokes) should be observed under certain spatial phase-matching conditions. The area theorem is formulated for all radiation components. An analysis is made of the case of propagation of a resonant electromagnetic pulse of frequency ω in a system of three-level atoms having an equidistant spectrum. Under conditions of preexcitation of the medium at the frequency 2ω by longitudinal acoustic pulses, a scattered transverse acoustic wave at the frequency ω may be observed.