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The influence of the phase fluctuation of the pump laser on thephase-correlation between the signal and idler modes of the output fields fromas non-degenerate optical parametric oscillator operating above oscillationthreshold was experimentally investigated. The noise spectra of theintensity-difference and the phase-sum of the entangled optical beams weremeasured with a pair of unbalanced fiber Match-Zehnder interferometersspecifically designed. The experimental results proved the previouslytheoretical prediction and are in reasonable agreement with the calculationbased on semiclassical theory involving the phase fluctuation of pump laser.

europhysics letters

Experimental investigation to influence of pump phase fluctuation on  phase-correlation of output optical fields from a non-degenerate parametric  oscillator