Journal article
General theory for spontaneous emission in active dielectric microstructures: Example of a fiber amplifier
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.
Language: | English |
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Publisher: | American Physical Society (APS) |
Year: | 2001 |
ISSN: | 10941622 , 10502947 and 24699926 |
Types: | Journal article |
DOI: | 10.1103/PhysRevA.64.033812 |