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Phys. Rev. Lett. 96, 065702 (2006) [4 pages]

Glassy Behavior of Light

L. Angelani,1 C. Conti,2,3 G. Ruocco,3,4 and F. Zamponi3,4
1Research Center SMC INFM-CNR, c/o Università di Roma "La Sapienza," I-00185, Roma, Italy
2Centro Studi e Ricerche "Enrico Fermi," Via Panisperna 89/A, I-00184, Roma, Italy
3Research Center Soft INFM-CNR, c/o Università di Roma "La Sapienza," I-00185, Roma, Italy
4Dipartimento di Fisica, Università di Roma "La Sapienza," I-00185, Roma, Italy

Received 22 September 2005; published 16 February 2006

We study the nonlinear dynamics of a multimode random laser using the methods of statistical physics of disordered systems. A replica-symmetry breaking phase transition is predicted as a function of the pump intensity. We thus show that light propagating in a random nonlinear medium displays glassy behavior; i.e., the photon gas has a multitude of metastable states and a nonvanishing complexity, corresponding to mode-locking processes in random lasers. The present work reveals the existence of new physical phenomena, and demonstrates how nonlinear optics and random lasers can be a benchmark for the modern theory of complex systems and glasses.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.065702
DOI: 10.1103/PhysRevLett.96.065702
PACS: 64.70.Pf; 42.55.Zz; 75.10.Nr
KEYWORDS: symmetry, optical pumping, laser mode locking, nonlinear optics, random media, laser theory

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