Fluorescence spectrum of a two-level atom driven by a multiple modulated field

Ficek, Z., Seke, J., Soldatov, A. V. and Adam, G. (2001) Fluorescence spectrum of a two-level atom driven by a multiple modulated field. Physical Review A, 64 1: . doi:10.1103/PhysRevA.64.013813

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Author Ficek, Z.
Seke, J.
Soldatov, A. V.
Adam, G.
Title Fluorescence spectrum of a two-level atom driven by a multiple modulated field
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2001
Sub-type Article (original research)
DOI 10.1103/PhysRevA.64.013813
Open Access Status File (Publisher version)
Volume 64
Issue 1
Total pages 10
Editor B. Crasemann
Place of publication United States
Publisher American Physical Society
Collection year 2001
Language eng
Subject C1
240301 Atomic and Molecular Physics
780102 Physical sciences
Abstract We investigate the fluorescence spectrum of a two-level atom driven by a multiple amplitude-modulated field. The driving held is modeled as a polychromatic field composed of a strong central (resonant) component and a large number of symmetrically detuned sideband fields displaced from the central component by integer multiples of a constant detuning. Spectra obtained here differ qualitatively from those observed for a single pair of modulating fields [B. Blind, P.R. Fontana, and P. Thomann, J. Phys. B 13, 2717 (1980)]. In the case of a small number of the modulating fields, a multipeaked spectrum is obtained with the spectral features located at fixed frequencies that are independent of the number of modulating fields and their Rabi frequencies. As the number of the modulating fields increases, the spectrum ultimately evolves to the well-known Mellow triplet with the sidebands shifted from the central component by an effective Rabi frequency whose magnitude depends on the initial relative phases of the components of the driving held. For equal relative phases, the effective Rabi frequency of the driving field can be reduced to zero resulting in the disappearance of fluorescence spectrum, i.e., the atom can stop interacting with the field. When the central component and the modulating fields are 180 degrees out of phase, the spectrum retains its triplet structure with the sidebands located at frequencies equal to the sum of the Rabi frequencies of the component of the driving field. Moreover, we shaw that the frequency of spontaneous emission can be controlled and switched from one frequency to another when the Rabi frequency or initial phase of the modulating fields are varied.
Keyword Optics
Physics, Atomic, Molecular & Chemical
2-level System Driven
Resonance Fluorescence
Subharmonic Resonances
Bichromatic Field
Multiphoton Processes
Population-inversion
Polychromatic Field
Absorption-spectrum
Laser-pulses
Smooth Pulse
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Tue, 14 Aug 2007, 16:01:09 EST