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Revised theory of resonant degenerate four-wave mixing with broad-bandwidth lasers

Alber, G. ; Cooper, J. ; Charlton, A. ; Meacher, D. R. ; Ewart, P. (1989)
Revised theory of resonant degenerate four-wave mixing with broad-bandwidth lasers.
In: Physical Review A, 40 (10)
doi: 10.1103/PhysRevA.40.5705
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

We present a revision of the theory of finite laser bandwidth effects on degenerate four-wave mixing (DFWM) of Alber, Cooper, and Ewart (ACE) [Phys. Rev. A 31, 2344 (1985)]. The same model is used for intense, broad-bandwidth pump lasers interacting with a weak monochromatic probe in a medium composed of two-level atoms. The density-matrix equations describing the time evolution of the atomic polarization coupled to fluctuating fields are solved using an appropriate decorrelation approximation. A steady-state analytical solution is found for resonant and near-resonant DFWM, for intensities that do not saturate the medium. For more intense fields it is found to be necessary to form a more complicated set of differential equations for all products of the field and atomic density-matrix elements. The results show that as in the ACE theory, increasing the bandwidth b leads to an increased effective saturation intensity. However, we find the DFWM reflectivity scales as 1/b2 when the probe is monochromatic and not 1/b as in the ACE theory. Furthermore, the saturation behavior of nonresonant DFWM is found to differ from the predictions of ACE. Atomic motion effects are shown to yield a Doppler-broadened line shape and also to affect the saturation behavior of the signal.

Typ des Eintrags: Artikel
Erschienen: 1989
Autor(en): Alber, G. ; Cooper, J. ; Charlton, A. ; Meacher, D. R. ; Ewart, P.
Art des Eintrags: Bibliographie
Titel: Revised theory of resonant degenerate four-wave mixing with broad-bandwidth lasers
Sprache: Englisch
Publikationsjahr: 1 November 1989
Verlag: APS Physics
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Physical Review A
Jahrgang/Volume einer Zeitschrift: 40
(Heft-)Nummer: 10
DOI: 10.1103/PhysRevA.40.5705
URL / URN: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.40.57...
Kurzbeschreibung (Abstract):

We present a revision of the theory of finite laser bandwidth effects on degenerate four-wave mixing (DFWM) of Alber, Cooper, and Ewart (ACE) [Phys. Rev. A 31, 2344 (1985)]. The same model is used for intense, broad-bandwidth pump lasers interacting with a weak monochromatic probe in a medium composed of two-level atoms. The density-matrix equations describing the time evolution of the atomic polarization coupled to fluctuating fields are solved using an appropriate decorrelation approximation. A steady-state analytical solution is found for resonant and near-resonant DFWM, for intensities that do not saturate the medium. For more intense fields it is found to be necessary to form a more complicated set of differential equations for all products of the field and atomic density-matrix elements. The results show that as in the ACE theory, increasing the bandwidth b leads to an increased effective saturation intensity. However, we find the DFWM reflectivity scales as 1/b2 when the probe is monochromatic and not 1/b as in the ACE theory. Furthermore, the saturation behavior of nonresonant DFWM is found to differ from the predictions of ACE. Atomic motion effects are shown to yield a Doppler-broadened line shape and also to affect the saturation behavior of the signal.

Fachbereich(e)/-gebiet(e): 05 Fachbereich Physik
05 Fachbereich Physik > Institut für Angewandte Physik
05 Fachbereich Physik > Institut für Angewandte Physik > Theoretische Quantenphysik
Hinterlegungsdatum: 02 Mai 2022 09:05
Letzte Änderung: 10 Mai 2022 07:30
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