General theory for spontaneous emission in active dielectric microstructures: Example of a fiber amplifier

Thomas Søndergaard, Bjarne Tromborg

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Abstract

A model for spontaneous emission in active dielectric microstructures is given in terms of the classical electric field Green's tensor and the quantum-mechanical operators for the generating currents. A formalism is given for calculating the Green's tensor, which does not rely on the existence of a complete power orthogonal set of electromagnetic modes, and the formalism may therefore be applied to microstructures with gain and/or absorption. The Green's tensor is calculated for an optical fiber amplifier, and the spontaneous emission in fiber amplifiers is studied with respect to the position, transition frequency, and vector orientation of a spatially localized current source. Radiation patterns are studied using a Poynting vector approach taking into account amplification or absorption from an active medium in the fiber.
Original languageEnglish
JournalPhysical Review A
Volume64
Issue number3
Pages (from-to)033812
ISSN2469-9926
DOIs
Publication statusPublished - 2001

Bibliographical note

Copyright (2001) American Physical Society

Keywords

  • SPONTANEOUS DECAY
  • KRAMERS-KRONIG DIELECTRICS
  • HERMITIAN OPTICAL-SYSTEMS
  • EXCESS SPONTANEOUS EMISSION
  • QUANTUM ELECTRODYNAMICS
  • PLANAR CAVITIES
  • ENHANCED SPONTANEOUS EMISSION
  • SEMICONDUCTOR-LASERS
  • INHIBITED SPONTANEOUS EMISSION
  • ELECTROMAGNETIC-FIELD

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