Coherence absorption and condensation induced by thermalization of incoherent nonlinear fieldsA. Picozzi1 and S. Rica2
1 Institut Carnot de Bourgogne, CNRS, Université de Bourgogne - Dijon, France, EU
2 Laboratoire de Physique Statistique, ENS, CNRS - Paris, France, EU
received 18 April 2008; accepted in final form 30 September 2008; published November 2008
published online 30 October 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.
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.
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