STUDY OF INDUCED TEMPORAL COHERENCE IN OPTICAL PARAMETRIC DOWN-CONVERSION

Temporal coherence of the idler photon beam induced by a coherent inpu t signal was studied for non-degenerate optical parametric down conver sion. When the optical path difference of the interferometer is much l onger than the coherence length of the spontaneous idler radiation, th e experimental results show that the first-order temporal coherence of the idler photon can be induced by a coherence input signal and the i nterference fringe visibility is determined by the intensity of the co herent input signal.