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Proceedings of the Physical Society

The level-crossing effect in resonance fluorescence stimulated by monochromatic light

George William Series

Published Dec 1, 1966• 16 citations
Publisher

Abstract

Analyses of the level-crossing effect have usually been given for broad-band excitation of resonance fluorescence. The fluorescence excited by monochromatic light from an assembly of static atoms would be expected to show a modified form of level-crossing effect, but, when motion of the atoms is taken into account, the same result is obtained as for broad-band excitation.

DOI
10.1088/0370-1328/89/4/325

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Analyses of the level-crossing effect have usually been given for broad-band excitation of resonance fluorescence. The fluorescence excited by monochromatic light from an assembly of static atoms would be expected to show a modified form of level-crossing effect, but, when motion of the atoms is taken into account, the same result is obtained as for broad-band excitation.
The problem of resonance fluorescence from a two-level atom that is driven near resonance by a laser beam of finite bandwidth is tackled via the Heisenberg equations of motion, by a simple generalization of our previous treatment. It is found that the two-time intensity correlation function is again factorizable into a product of the mean light intensities at the two times, each of which is slightly modified under broad-band excitation from its value under monochromatic excitation. The spectrum of the fluorescence is affected rather more drastically, and, in general, becomes asymmetric under broad-band excitation.
A level-crossing effect in stimulated emission is used to determine precisely the hfs in an excited electronic state of Xe129{\mathrm{Xe}}^{129}Xe129. The effect arises from a resonant change in nonlinear polarization induced by a monochromatic field as appropriate tunable level pairs are made to cross.
An analysis is made of a light-induced drift observed under cascade excitation of atomic levels. A detailed description is given of the drift in the case of absorption of monochromatic and quasimonochromatic radiation as a result of a transition between the excited states. Preliminary excitation is provided either by broad-band radiation or by traditional nonlaser methods. It is shown that the drift is possible also when the transport cross sections of the particles which are at the active levels (involved in a transition under the action of resonance monochromatic or quasichromatic radiation) are identical: a difference between the transport cross sections for any pair of levels is sufficient for the occurrence of the drift.
A two-state atom in a perturber gas is irradiated by intense light with an arbitrary spectral profile. The authors derive a general expression for the fluorescence spectrum in terms of the conventional low-intensity absorption profile and the spectral density of the incident light. This result, which contains previous results as special limiting cases, describes the transition from the three-line fluorescence spectrum excited by intense monochromatic light and the power-broadened Lorentzian spectrum produced by broad-band excitation.