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Springer eBooks

Resonance Behavior of a Two-Level Atom Driven by Amplitude- or Frequency-Modulated Fields

Wilhelmus M. Ruyten

Published Jan 1, 1990• 0 citations
Publisher
DOI
10.1007/978-1-4613-0847-8_187

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We present a detailed theoretical treatment of the response of a two-level atom to a fully-amplitude-modulated, narrow-band optical field. Specifically, we calculate the resonance behavior of modulated fluorescence and susceptibility components from the scalar continued-fraction solution of the optical Bloch equations. In the limit of vanishing damping the resonances are generally doubly branched: One set of branches reproduces the resonances of the time-averaged fluorescence, while the second set is different for each harmonic component. However, each branch is uniquely associated with an odd multiple quantum resonance. In analogy with magnetic resonance work, we derive analytical expressions for the generalized Bloch-Siegert shifts of the additional resonances. We discuss also the possibility of experimental verification of the theory.

Physical Review A•Aug 1, 1989•30 citations
Pomeau et al.1 have shown that a two-level atom strongly driven by a single 100% amplitude modulated (AM) field can show broadband spectral behavior when the two-frequency components of the field are incommensurate. The equations describing the atomic response to a monochromatic field without making the rotating wave approximation (RWA) are identical to form to the equations describing a 100% amplitude modulated field within the RWA. This fact makes the observation of the predictions of Pomeau et al. experimentally realizable in an optical resonance experiment. We present theoretical and numerical results of a pair of 100% AM fields interacting with a single atomic resonance. The effects on the atomic response of commensurate and incommensurate modulation frequencies are discussed as are the experimental implications.
We present a detailed theoretical treatment of the response of a two-level atom to a fully-amplitude-modulated, narrow-band optical field. Specifically, we calculate the resonance behavior of modulated fluorescence and susceptibility components from the scalar continued-fraction solution of the optical Bloch equations. In the limit of vanishing damping the resonances are generally doubly branched: One set of branches reproduces the resonances of the time-averaged fluorescence, while the second set is different for each harmonic component. However, each branch is uniquely associated with an odd multiple quantum resonance. In analogy with magnetic resonance work, we derive analytical expressions for the generalized Bloch-Siegert shifts of the additional resonances. We discuss also the possibility of experimental verification of the theory.