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Quantum Electronics

Radiative processes in a bichromatic laser field with multiple frequencies

Valery Alexandrovich Astapenko

Published Dec 31, 2006• 16 citations
Publisher

Abstract

A review of experimental and theoretical studies on radiative processes induced by a bichromatic (two-frequency) laser radiation in atoms, molecules, and solids is presented. The optical excitation of matter is considered at transitions of different types: bound—bound, bound—free, and free—free. A special attention is devoted to the possibility of the coherent control of the basic characteristics of radiative phenomena by varying the relative phase of monochromatic components of radiation. It is shown that this method opens up new possibilities for controlling photoinduced processes.

DOI
10.1070/qe2006v036n12abeh013231

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Coherent phase control under the interaction between bichromatic radiation with multiple frequencies and quantum systems is the topic of the last time investigations both experimental and theoretical. This type of nonlinear optical control enables one to manipulate the characteristics of radiation processes by the change of the relative phase of bichromatic field. The present study is devoted to the theoretical analysis of the coherent control of two-level system behavior under bichromatic excitation in the frame of perturbation approach. The general expressions have been derived which are valid for any integer ratio n between the frequencies of monochromatic components of radiation. Obtained formulas describe the system characteristics as functions of relative phase of bichromatic field and other radiation parameters. Bichromatic excitation of Rubidium atom is considered as numerical example.
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The paper is devoted to the theoretical investigation of the phase control of atomic photo-excitation in discrete energy spectrum under the action of bichromatic laser field with the frequency ratio 1:2 in the presence of stationary electric field. The calculations are made for the case of alkali atoms. It is shown that the phase modulation of the photo-excitation strongly depends upon the electric field strength and the ratio between the intensities of the monochromatic components of the radiation. The optimal range of parameters for the effect observation is determined.
The paper is devoted to the theoretical study of the possibility of coherent control of the vibrational-rotational transitions in diatomic molecule under the action of bichromatic laser field. Two possible absorption branches are considered. Dependencies of the control efficiency upon the parameters involved such as gas temperature and electric field amplitudes of the monochromatic components are investigated. Numerical calculations are performed for the case of CO molecule in Morse approximation. The possibility of the efficient coherent control of the considered process is demonstrated.