Consecutive quasi-synchronous interactions in nonlinear optics: New possibilities for generating nonclassical light

The features of consecutive interactions of three light waves with the mult iple frequencies in periodically polarized nonlinear crystals are discussed . Such interactions allow one, in particular, to perform simultaneously qua si-synchronous parametric amplification upon the same high- and low-frequen cy pumping. It is shown that in this case the quadrature squeezed light is generated at the amplified frequencies.