Scattering-Enhanced Femtosecond Optical Parametric Generation

Scattering-enhanced femtosecond optical parametric generation (OPG) has
been observed and studied in detail, which may decrease the pump threshold of OPGs dramatically and may make OPGs reliable. The experimental demonstration in a LiNbO₃ crystal shows that strong enough OPG can be obtained at pump intensity of only about 30GW/cm² which is well below the crystal damage threshold. Either a synchronized pulsed laser or a cw laser has been used as the scattering source, of which the wavelength, spectral shape and irradiating angle are not strictly required.