Spatial selectivity of the four-wave radiation converter in a transparent two-component medium in a scheme with concurrent pump waves

Spatial characteristics of the degenerate four-wave radiation converter in a liquid containing nanoparticles were studied using a scheme with concurrent pump waves. The phase matching condition was shown to determine the general form of the spatial spectrum amplitude of the object wave, with the electrostriction phenomenon and Dufour effect shown to cause the emergence of dips in the spatial spectrum amplitude, with the dip positions corresponding to the propagation directions of the pump waves. The relationship between characteristics of the dips and the pump wave parameters were obtained.