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Journal of Physics B Atomic and Molecular Physics

Resonance interaction of autoionising states with an intense electromagnetic field

A. I. Andryushin, Mikhail Vladimirovich Fedorov, Alexey E. Kazakov

Published Sep 4, 1982• 30 citations
Publisher

Abstract

A resonance interaction of two autoionising atomic states with an external electromagnetic field is considered. The dispersion curve for absorption of the second weak (probe) wave is found. Conditions are found for which the narrower of the two peaks of this curve has a minimum width. The widths of the peaks are found analytically. The possibilities of narrowing are discussed.

DOI
10.1088/0022-3700/15/17/018

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A resonance interaction of two autoionising atomic states with an external electromagnetic field is considered. The dispersion curve for absorption of the second weak (probe) wave is found. Conditions are found for which the narrower of the two peaks of this curve has a minimum width. The widths of the peaks are found analytically. The possibilities of narrowing are discussed.
The shape of the resonance of a saturated absorption is calculated at an arbitrary intensity of a probe field. It is revealed that, in the case of orthogonal polarizations of strong and probe fields, an increase in the intensity of the probe field can invert the shape of the nonlinear resonance of clearing of the medium, changing it to the resonance of absorption. The saturation of optical transitions by intrinsic spontaneous radiation increases the contrast of the inverted resonance of saturation and narrows its width. In the case of parallel polarizations of the optical fields, an absorption peak can arise in the shape of the nonlinear resonance upon splitting of the lower state.
The spectrum of absorption of a probe field of arbitrary intensity by three-level atoms with the Λ configuration of levels in the field of a strong electromagnetic wave acting on an adjacent transition is studied theoretically. It is shown that the supernarrow resonance, revealed earlier by us, in the absorption spectrum of the probe field far from the resonance with the atomic transition is retained as the probe field intensity increases. The dependence of the amplitude and of the width of the supernarrow resonance on the probe-field intensity is elucidated. The resonance contrast decreases insignificantly (by only a factor of several), even when the probe-field intensity becomes comparable with the intensity of the strong field.
An analysis is made of the feasibility of obtaining two-photon absorption resonances of 10–100 Hz width under conditions of longitudinal interaction with a standing-wave field. The long atom– field interaction time makes it possible to increase the resonance intensity. It is established that in a system with a beam of atoms propagating along an optical beam, the contribution of slow atoms results in the formation in the second derivative of the line profile of a resonance characteristic with a radiative width. An analysis is made of the influence of the quadratic Doppler effect, Stark effect, and saturation.
Summary form only given. Results are presented of theoretical studies into the resonances of the saturated absorption and saturated dispersion in an external absorption cell. The theory has been worked out by means of combining methods of mathematical theory of diffraction and quantum mechanical method for computing the polarization of active media. This made it possible for the first time to find a self-consisting spatial solution of the density matrix equation for the two-level system and the Helmholtz equation for electromagnetic field and to solve the problem of propagation of two counterpropagating monochromatic waves though an absorbing nonlinear medium taking into consideration the transverse transit-time effect.