Fluorescence versus laser effect

Towards a unified theory

Jacob Szeftel, Antoine Khater, Nicolas Sandeau

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A single evolution equation is established to treat the mechanisms of fluorescence and the laser effect, using a mixed representation, classical for the electromagnetic field and quantum for the dipoles. The model approach takes advantage of the principle of conservation of energy for the system of electromagnetic field and dynamic dipole. A resulting nonlinear differential equation is derived and is shown to sustain two fixed points associated with fluorescence and laser emission. The existence of a pumping threshold is confirmed for the laser effect. In particular the pumping rate determines whether light will be emitted by fluorescence or by the laser effect, and there is no pumping that engenders fluorescence and laser emission simultaneously. The initial physical conditions, chosen to integrate the evolution equation in time, assume a nonvanishing electric polarization of the emitting dipole rather than a nonvanishing electromagnetic field. The distribution function accounting for the thermal fluctuations of the random initial polarization is also calculated.

Original languageEnglish
Pages (from-to)4602-4608
Number of pages7
JournalOptics Communications
Volume282
Issue number23
DOIs
Publication statusPublished - 1 Dec 2009
Externally publishedYes

Fingerprint

Pumping (laser)
Fluorescence
fluorescence
Lasers
Electromagnetic fields
electromagnetic fields
pumping
lasers
dipoles
Polarization
polarization
Distribution functions
conservation
Conservation
Differential equations
differential equations
distribution functions
thresholds
energy

Keywords

  • Fluorescence theory
  • Laser theory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Fluorescence versus laser effect : Towards a unified theory. / Szeftel, Jacob; Khater, Antoine; Sandeau, Nicolas.

In: Optics Communications, Vol. 282, No. 23, 01.12.2009, p. 4602-4608.

Research output: Contribution to journalArticle

Szeftel, Jacob ; Khater, Antoine ; Sandeau, Nicolas. / Fluorescence versus laser effect : Towards a unified theory. In: Optics Communications. 2009 ; Vol. 282, No. 23. pp. 4602-4608.
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