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Updated: May 26, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Coherence effects on photon absorption in optically thick plasmas.

¹Laboratoire PIIM, UMR Université de Provence / CNRS, Centre de Saint-Jérôme, Marseille, France. joel.rosato@univ-provence.fr

Physical Review Letters

|December 21, 2011

Summary

This summary is machine-generated.

This study shows that photon emission and absorption in plasmas are spatially delocalized, significantly impacting spectral line opacity. Consequently, spectral profiles and escape factors can exceed predictions from standard models.

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Area of Science:

Plasma physics
Radiative transfer

Background:

Optically thick plasmas exhibit complex radiative transfer phenomena.
Traditional models often assume localized photon interactions.

Purpose of the Study:

To investigate the impact of spatial coherence on line radiation in optically thick plasmas.
To re-evaluate plasma opacity and spectral escape factors.

Main Methods:

Application of a kinetic photon transport model.
Inclusion of spatial coherence effects in the model.
Analysis of line radiation in optically thick plasma scenarios.

Main Results:

Photon emission and absorption processes are found to be delocalized in space.
Plasma opacity to spectral lines is significantly altered by this delocalization.
Spectral profiles and escape factors are larger than predicted by conventional formulas.

Conclusions:

Spatial coherence plays a crucial role in radiative transfer within plasmas.
Standard formulas for spectral profiles and escape factors may underestimate these properties in optically thick plasmas.
The findings necessitate revised theoretical frameworks for plasma radiation.