Phase transition in a radiation-matter interaction with recoil and collisions

Year: 2001

Authors: Perrin M., Lippi G.L., Politi A.

Autors Affiliation: Institut Non Linéaire de Nice, UMR 6618 CNRS-UNSA, 1361 Route des Lucioles, 06560 Valbonne, France;
Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: The standard model introduced to describe the collective atomic recoil of an ensemble of atoms interacting with a strong electromagnetic field has been hen extended by the inclusion of collisions with a buffer gas. As a result, we find that in the thermodynamic limit the coherent emission of radiation exhibits a continuous phase transition upon increasing the pump intensity. The output laser field is strictly larger than 0 only above a critical value. We find that the transition is not associated with the onset of spatial ordering but rather with the onset of a synchronization between the polarization phase and spatial position. A coherence parameter is introduced to characterize the phase transition.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 86 (20)      Pages from: 4520  to: 4523

KeyWords: Collective Atomic Recoil; 2-level Atoms; Laser; Amplification; Vapor; Gain; Gratings
DOI: 10.1103/PhysRevLett.86.4520

Citations: 16
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