Optical limiting properties of C-60 and C-70-doped organic thin films (polyimide, 2-cyclooctylamio-5-nitropyridine) under a laser irradiation at wavelengths of 5.32, 1047, and 1315 nm have been studied. The films can be applied as laser power attenuators at a laser energy density of more titan 2 J.cm(-2) anal at a laser energy density up to 0.8-1 J.cm(-2) in the visible anal near infrared spectral ranges, respectively. Reverse saturable absorption and the complex formation have been. discussed to explain optical limiting results. The place of the materials studied can be predicted among other nonlinear optical systems attenuating high energy density in the near infrared.