Volume 84, Number 3, November 2008
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||30 October 2008|
Coherence absorption and condensation induced by thermalization of incoherent nonlinear fields
Institut Carnot de Bourgogne, CNRS, Université de Bourgogne - Dijon, France, EU
2 Laboratoire de Physique Statistique, ENS, CNRS - Paris, France, EU
Corresponding author: Antonio.Picozzi@u-bourgogne.fr
Accepted: 30 September 2008
We show that a conservative system of incoherent nonlinear waves exhibits, as a rule, an irreversible process of coherence transfer, in which the incoherence of the system is absorbed by the small-amplitude field, thus allowing the high-amplitude field to evolve towards a highly condensed coherent state. This process of coherence absorption results from the natural thermalization of the fields to a thermodynamic equilibrium state. The theory reveals that, contrary to a classical gas system, a wave system does not satisfy an equipartition of energy among the particles. Such a distinctive feature is the key property underlying the existence of the coherence absorption process. The coherence absorption effect is shown to also occur in a system of quantum Bose gases.
PACS: 42.65.Sf – Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics / 42.25.Kb – Coherence / 05.45.-a – Nonlinear dynamics and chaos
© EPLA, 2008
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