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Journal of Physics B Atomic and Molecular Physics

The 'physical spectrum' of the light scattered by a strontium-like atom driven by a pulsed laser

Janusz Czub, S Kryszewski

Published Sep 14, 1983• 9 citations
Publisher

Abstract

The numerically computed 'physical spectrum' of light scattered near the collisionally perturbed S 0 -P 1 resonance is presented. The authors assume that the strong laser pulse is rectangular, and apply the dressed-atom approach generalized to time-dependent processes. The influence of the interferometer of bandwidth Gamma on the obtained spectra is discussed. The authors show that Gamma either small or large affects the spectra strongly, thus distorting the information about the atomic system.

DOI
10.1088/0022-3700/16/17/010

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Journal of Physics B Atomic and Molecular Physics•Mar 14, 1978•36 citations
The numerically computed 'physical spectrum' of light scattered near the collisionally perturbed S 0 -P 1 resonance is presented. The authors assume that the strong laser pulse is rectangular, and apply the dressed-atom approach generalized to time-dependent processes. The influence of the interferometer of bandwidth Gamma on the obtained spectra is discussed. The authors show that Gamma either small or large affects the spectra strongly, thus distorting the information about the atomic system.
The authors have studied the fluorescence spectrum of a two-level atom interacting with a resonant smooth laser pulse. Assuming a filter width larger than the Fourier width of the pulse, an approximate analytic closed form for the power spectrum valid for any pulse shape is obtained. In these conditions the power spectrum exhibits a time-developing three-peak structure, while the energy spectrum presents a single line, unless the pulse is near rectangular. Theoretical energy spectra are in qualitative agreement with measurements of the resonance fluorescence emitted by strontium atoms irradiated by short laser pulses.
The time-dependent theory of Courtens and Sz\"oke is generalized using the approach of Burnett et al. to derive time-dependent spectral intensities of resonance fluorescence from atoms driven by a pulsed laser in the presence of collisions. These results are valid both for laser detunings inside and outside the usual impact region of the spectrum, including Zeeman degeneracy effects. We apply this theory to a simple but important example (J=0J=0J=0 to J=1J=1J=1) to obtain quantitative predictions for the observable scattered-light spectrum which can be directly compared with recent experiments.
The time-dependent spectrum of the light scattered by a collisionally damped two-level atom weakly excited off resonance by a partially coherent laser field is evaluated. Both the collisional and the laser noise are treated as classical Markovian, Gaussian processes while, in addition, the atom is assumed to experience damping and fluctuations that are due to its coupling to an unspecified exterior reservoir. The scattered-field spectra are determined both at steady state and at times following the abrupt turn off of the laser field (the delayed spectrum). The distinct contributions to these spectra arising from the various noise sources as well as the finite bandwidth of the detecting interferometer are investigated in each case. Where appropriate, comparisons are made with related work of Saari [ Light Scattering in Solids ( Plenum, New York, 1979)]. A general inequality is also found that must be satisfied by the longitudinal and the transverse decay rates induced by the exterior reservoir. Finally, the inverse detuning of the laser is found to provide a limit on the time in which the undressing of the atom could be observed to occur following the turn off of the laser.