Light in opaque atomic vapour : radiation trapping, random laser and Lévy flights
type: Distribution
access URL: https://theses.hal.science/tel-00952969
format: HTML
issued: 2026-05-06T05:18:09.978595
modified: 2026-05-06T05:18:09.932159

Light in opaque atomic vapour : radiation trapping, random laser and Lévy flights
type: Dataset
contact point: Organization
  fn: CCSD
keyword: atomes-froids
keyword: cold-atoms
keyword: levy-flights
keyword: theses
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: random-laser
keyword: laser-aleatoire
keyword: infoeu-reposemanticsdoctoralthesis
keyword: radiation-trapping
keyword: piegeage-radiatif
keyword: diffusion
keyword: light-scattering
keyword: amplified-spontaneous-emission
keyword: vols-de-levy
keyword: emission-spontannee-amplifiee
landing page: https://theses.hal.science/tel-00952969
description: The matter-light interaction in opaque media gives rise to collective effects which may be explained by the coupling between atomic equations and light transfer equation. The trapping of light in an opaque multi-levels atomic system will be studied experimentally in a cold vapour and theoritically. Then, this vapour will be in situation with gain and amplification of light occurs. We will show that a laser threshold exists with this kind of system. Experimentally, the mixing of Raman gain and multiple scattering on a resonant line allowed the abservation a cold-atom random laser. The validity of diffusion equation needs a non frequency shift and so the temperature of atoms should be sufficiently cold to avoid Doppler effect. Finally we study the transport of light in an opaque hot atomic vapour (20°C-180°C). The Doppler effect breaks the Beer-Lambert law for photons step size distribution which is then a Levy flight statictics.
identifier: NNT: 2013NICE4077
issued: 2026-05-06T05:18:09.956718
language: fr
modified: 2026-05-06T05:18:09.956723

test_moissonnage_selune
type: Agent