The quantum mechanical description of parametric fluorescence is the splitting of a single photon into two photons. This description has been verified by observing coincidences between photons emitted by an ammonium dihydrogen phosphate crystal pumped by a 325-nm He-Cd laser. The coincidence rate RC decreases to the calculated accidental rate [<0.03RC(max)], unless the two detectors are arranged to satisfy energy and momentum conservation and have equal time delays.
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Burnham et al. (1970) studied this question.
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