Two-photon resonance absorption in four-level systems

Kieu T.D. and Dalton B.J. (1984) Two-photon resonance absorption in four-level systems. Optica Acta, 31 11: 1307-1319. doi:10.1080/713821445


Author Kieu T.D.
Dalton B.J.
Title Two-photon resonance absorption in four-level systems
Journal name Optica Acta   Check publisher's open access policy
ISSN 0030-3909
Publication date 1984
Sub-type Article (original research)
DOI 10.1080/713821445
Volume 31
Issue 11
Start page 1307
End page 1319
Total pages 13
Subject 2504 Electronic, Optical and Magnetic Materials
Abstract An unconventional perturbation treatment of the theory of two- photon absorption in a four-level atomic system close to two-photon resonance is developed on the basis of the optical Bloch equations. The results for the longtime populations of the intermediate and upper states are valid in low- and medium-intensity regimes. In both regimes the upper state population shows a lorentzian resonance centred on zero two-photon detuning with a width equal to the natural linewidth of the upper state. The intermediate state population shows a similar behaviour in the intermediate regime only, with no significant dependence on two-photon detuning in the low-intensity regime. However, in both regimes the population of the virtual intermediate state is at least comparable to that of the resonant upper state. The perturbation theory results have been checked by direct numerical calculations based on the Bloch equations. Numerical calculations confirm the presence of a high-intensity regime characterized by power shifts, broadening and saturation effects.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 05 Jul 2016, 05:24:02 EST by System User