2-BEAM PUMPED TRAVELING-WAVE OPTICAL PARAMETRIC GENERATOR

The investigation results of a subnanosecond travelling-wave optical p arametric generator (OPG) based on KDP crystal (type II phase matching ) pumped by two intersecting beams are presented. It is found that the broad angular and frequency spectrum of OPG caused by noncollinear in teractions can be significantly reduced by means of the double phase m atching in the field of two pump beams. Two-beam pump technique should be very promising in picosecond and subpicosecond travelling-wave OPG to produce bandwidth- and diffraction-limited output.