title: Experimental observation of critical phenomena in a laser light system.
abstract: We experimentally demonstrate critical behavior of a passively mode-locked laser with properties that are similar to those of gas-liquid and magnetic spin systems. The laser light modes provide a special nonthermodynamic many-body system where noise takes the role of temperature. It is also a rare opportunity of an experimental pure one-dimensional system. As theoretically predicted, we identified in the laser light-mode system two thermodynamiclike phases, one characterized by spontaneous pulses and the second by field-induced parapulses, separated by a first order phase transition boundary that is terminated by the critical point. We also measured the critical exponents, β≈0.52, γ≈1, and δ≈3.1, which are close to the mean field values that are exact in the laser system.
authors.affiliation: Department of Electrical Engineering, Technion, Haifa 32000, Israel.
authors.forename: Amir
authors.initials: A
authors.lastname: Rosen
authors.forename: Rafi
authors.initials: R
authors.lastname: Weill
authors.forename: Boris
authors.initials: B
authors.lastname: Levit
authors.forename: Vladimir
authors.initials: V
authors.lastname: Smulakovsky
authors.forename: Alexander
authors.initials: A
authors.lastname: Bekker
authors.forename: Baruch
authors.initials: B
authors.lastname: Fischer