Two-photon spectron

The propagation of a two-photon light in a transparent medium with group velocity dispersion is considered. It is shown that, even in the stationary case of two-photon light generation by cw pumping, the second-order light correlation function behaves like a short pulse: when propagating in a medium, this function smears and, at large distances acquires the spectral shape of two-photon radiation. (C) 2002 MAIK Nauka / Interperiodica.