We report on a recent model introduced to describe the behaviour of light in a nonlinear active random medium, i.e. a random laser. The emitted radiation is described by a disordered mean-field Hamiltonian for the phases of the complex amplitudes of the electromagnetic field modes. Using the replica trick the thermodynamics can be exactly solved. A replica-symmetry breaking phase transition is predicted, corresponding to mode-locking processes in random lasers. The expected random laser phase diagram varying the pumping rate is reported, together with some perspectives opened by the present study.
A glassy model for random lasers / Angelani, L.; Conti, Claudio; Ruocco, Giancarlo; Zamponi, F.. - In: PHILOSOPHICAL MAGAZINE. - ISSN 1478-6435. - STAMPA. - 87:3-5(2007), pp. 587-595. [10.1080/14786430600865364]
A glassy model for random lasers.
CONTI, CLAUDIO;RUOCCO, Giancarlo;F. ZAMPONI
2007
Abstract
We report on a recent model introduced to describe the behaviour of light in a nonlinear active random medium, i.e. a random laser. The emitted radiation is described by a disordered mean-field Hamiltonian for the phases of the complex amplitudes of the electromagnetic field modes. Using the replica trick the thermodynamics can be exactly solved. A replica-symmetry breaking phase transition is predicted, corresponding to mode-locking processes in random lasers. The expected random laser phase diagram varying the pumping rate is reported, together with some perspectives opened by the present study.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.