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 omega_0. The pump beam generates a second-harmonic mode at frequency 2 omega_0 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.
© 2005 Optical Society of America
Laurent Longchambon, Nicolas Treps, Thomas Coudreau, Julien Laurat, and Claude Fabre, "Experimental evidence of spontaneous symmetry breaking in intracavity type II second-harmonic generation with triple resonance," Opt. Lett. 30, 284-286 (2005)