Photon statistics in harmonic generation processes with a weak input chaotic field

The time evolution of the normally ordered photon number variance of the fundamental mode inm-th harmonic generation processes in the case of a weak input chaotic field is considered. It is shown that the fundamental mode may reveal sub-Poissonian photon statistics, however, in the course of second-harmonic generation solely.This work was carried out within the program No 2 0150 91 01 of the Polish Committee for Scientific Research.