Four wave interaction on thermal nonlinearity at large reflectance with allowance pumping waves self-diffraction

The influence of reflectance on a quality of wave-front reversal has been considered at four wave interaction on thermal nonlinearity. It was shown, that at equal pumping waves intensities with growth of a reflectance the spatial spectrum width of the four wave converter of radiation decreases. The dependences of object wave reflectance, spatial spectrum width of object wave, transformation coefficient of signal wave from pumping waves intensity have been obtained at various ratios between pumping waves amplitudes.