Photoinduced Phenomena in Conjugated Organic Systems Doped with Fullerenes

ABSTRACT Optical limiting properties of C60 and C70-doped organic thin films (polyimide, 2-cyclooctylamino-5-nitropyridine) under a laser irradiation at wavelengths of 532, 1047, and 1315 nm have been studied. The films can be applied as laser power attenuators at a laser energy density of more than 2 J·cm−2 and at a laser energy density up to 0.8–1 J·cm−2 in the visible and 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.