Abstract
Recently the analogy with phase transition was revealed for photorefractive coherent oscillators.1,2 It has been shown that the onset of oscillation in the ring-loop oscillator and Double Phase Conjugate Mirror (DPCM) exhibits similar features as Second Order Phase Transition: (1) the numerous small-amplitude photorefractive gratings responsible for light-induced scattering below the transition point evolve into one high-amplitude grating which couples the pump and oscillation waves; (2) the oscillation wave intensity is increasing gradually with coupling strength -yl from zero at the threshold; and (3) the critical slowing down is observed in temporal development of the light-induced scattering.
© 1999 Optical Society of America
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