The role of finite spatial beam profiles on photo-luminescence and laser cooling in GaAs structures

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

We present a microscopic many-body theory of optical refrigeration of semiconductors with finite spatial beam profile extension. The theory is an extension of our previous theory of optical refrigeration of GaAs, which had been limited to spatially homogeneous systems. In it, optically excited electron-hole pairs can be an unbound pairs, or pairs bound by the attractive Coulomb interaction (excitons). Assuming the electron-hole pairs to be in quasi-thermal equilibrium, our theory calculates its absorption and luminescence spectra within a diagrammatic (real-time) Green's function approach at the selg-consistent T-matrix level. The present extension to lateral spatial inhomogeneities due to finite beam spot size utilizes a photon transport equation which is based on a diagrammatic formulation of finite beam spot size utilizes a photon transport equation which is based on a for simplicity, and analytical solution for the pair density and power density rate equations is obtained, and numerical self-consistent solutions are presented. The result show that for typical beam waist parameters, lateral (radial) photon transport does not significantly impede the theoretically predicted cooling process.

Original languageEnglish (US)
Article number722805
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume7228
DOIs
StatePublished - Apr 6 2009
EventLaser Refrigeration of Solids II - San Jose, CA, United States
Duration: Jan 28 2009Jan 29 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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