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Soviet Journal of Quantum Electronics

Kinetics of a transient two-beam interaction in resonant media

V. V. Zherdienko, E.K. Kirilenko, Svetlana A. Lesnik, Vladimir B. Markov, A I Khizhnyak, F M Yatsyuk

Published Nov 30, 1991• 1 citation
Publisher

Abstract

An experimental and theoretical investigation was made of the kinetics of a concurrent two-beam interaction in a sodium vapor. A change in the pulse shapes of the interacting beams was noted, particularly an enhancement of their modulation, as they propagated in the resonant medium. The deformation of the beams was caused by both bleaching of the medium under the action of the waves and by transient energy transfer between the waves in a dynamic grating formed in the medium.

DOI
10.1070/qe1991v021n11abeh004511

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An experimental and theoretical investigation was made of the kinetics of a concurrent two-beam interaction in a sodium vapor. A change in the pulse shapes of the interacting beams was noted, particularly an enhancement of their modulation, as they propagated in the resonant medium. The deformation of the beams was caused by both bleaching of the medium under the action of the waves and by transient energy transfer between the waves in a dynamic grating formed in the medium.
An experimental investigation was made of the spectral dependences of the gain of a signal beam in the presence of transient frequency-degenerate collinear two-beam interaction in sodium vapor, for the purposes of elucidating the characteristic features of two-beam energy transfer in resonant media. A comparison of the experimental data with the results of a theoretical analysis made it possible to relate the low gain of the signal beam gain to the small energy-transfer contribution of diffraction by the phase component of a dynamic grating and the practically equal contribution of diffraction by its amplitude component.
An investigation was made of the transient process of formation of volume dynamic holograms by light within the spectral limits of the D 2 resonant absorption line of sodium. The observed asymmetry of the spectral distribution of the gain of the signal waves in the case of a concurrent interaction between four beams was attributed to different mechanisms of the interaction, the main of which were a four-wave interaction in the long-wavelength wing and transient two-beam energy transfer in the short-wavelength wing. The results obtained were used to recommend an experimental method for the determination of the relative contributions of these processes to the amplification of signal waves.
We have studied two-wave mixing in resonant media. Illumination with two beams of the same frequency leads to the formation of a spatially local volume grating with no exchange of energy between the writing beams, each beam merely reducing the absorption experienced by the other beam. Nondegenerate two-wave mixing leads to gain for one beam and additional absorption for the other beam as they propagate through the medium. Starting from first principles, the explicit forms of the two-beam coupling constants are derived using third-order perturbation theory, and their dependence on material and experimental factors is examined.
We present the theoretical model of coherent interactions of the light beams in a two-level resonant medium, taking into account a spatial-periodic modulation of the parameters of nonlinear medium in an interference field as well as nonlinear behavior of refractive index and absorption coefficient due to optical bleaching. As evidenced by the results of investigations described in this work, the process of light beams interaction via scattering from dynamically-induced optical gratings in two-level resonant medium is characterized by a number of interesting features like mutual attraction and repulsion, irradiation of additional beams probably due to soliton-soliton diffraction mode, formation of dark spatial solitons in the mode of defocusing interaction that can be used for all-optical control over the spatial structure of laser beams