title: Experimental evidence of spontaneous symmetry breaking in intracavity type II second-harmonic generation with triple resonance.
abstract: We describe a spontaneous symmetry-breaking phenomenon between the intensities of the ordinary and extraordinary components of the fundamental field in intracavity type II harmonic generation. It is based on a triply resonant cavity containing a type II chi(2) crystal pumped at fundamental frequency omega0. The pump beam generates a second-harmonic mode at frequency 2omega0 that acts as a pump for frequency-degenerate type II parametric downconversion. Under operating conditions symmetric with respect to the ordinary and extraordinary components of the fundamental wave, we show a breaking of the symmetry of the intensities of these two waves.
authors.affiliation: Laboratoire Kastler Brossel, Université Pierre & Marie Curie, Case 74, 4 Place Jussieu, 75252 Paris Cedex 05, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Longchambon
authors.forename: Nicolas
authors.initials: N
authors.lastname: Treps
authors.forename: Thomas
authors.initials: T
authors.lastname: Coudreau
authors.forename: Julien
authors.initials: J
authors.lastname: Laurat
authors.forename: Claude
authors.initials: C
authors.lastname: Fabre