Abstract

We investigate the theory of the process in which an idler photon emitted spontaneously from a nonlinear crystal in the process of parametric downconversion serves as idler input to a second downconverter. The signal photon from this second crystal is then detected in coincidence with the signal photon from the first crystal, which provides the time reference. We show that the first idler photon can induce a stimulated downconversion in the second crystal, which serves as a photon amplifier, and we calculate the ratio of the stimulated to the spontaneous emission probability.

© 1990 Optical Society of America

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