The laser-induced processes in the fullerene-doped π-conjugated organic systems based on polyimide, 2-cyclooctylamino-5 nitropyridine, polyaniline, polymer-dispersed liquid crystals, etc. have been studied. The optical limiting experiments have been performed at wavelength of 532, 1047, 1080, 1315 and 2940 nm. The optical limiting threshold has been found. The reversible holographic recording experiments have been carried out at 532 and 1315 nm under the Raman-Nath diffraction conditions at spatial frequency of 100 mm-1. The nonlinear refraction and third order susceptibility have been estimated from holographic recording data. The place of the systems studied among other materials used traditionally for nonlinear optics has been established.