The results of theoretical and experimental studies on photodynamics and mechanism of nonlinear optical processes, responsible for optical limiting of power radiation in the wavelength range from 0.3 to 1.3 microns, are presented. Peculiarities in the mechanisms of optical limiting for different fullerene-containing matrices, including solutions, solid-state and polymer systems, are shown.
We consider the possibility to design the thhlerene-oxygen-iodine laser with optical pumping (solar, particularly) [1]. It is assumed that singlet oxygen is formed at pass ofmolecular oxygen through (and interaction with) mixture oflower and higher fullerenes in the triplet metastable state obtained at illumination of fullerenes. The presented results of estimates by a photokinetic model show the opportunity to reach the efficiency of the FOIL with solar pumping at the level of several tens of percents. We present the results of experimental and theoretical studies of singlet oxygen yield at interaction of optical pumping with frillerene in solutions. Laser radiation with wavelength of 532 nm and wideband lamp radiation for imitation of solar radiation were used as pumping. The paper presents the first experimental results on the yield of singlet oxygen, produced in vacuum chamber via interaction of gas-phase molecular oxygen with thllerene devices, irradiated by solar-like lamp emission.
The electric field ionization of the self-trapped exciton is studied and the results are interpreted in terms of the Schottky effect theory. Though the possibility of internal radiationless transitions is not excluded, the idea of thermal ionization of the self-trapped exciton finds experimental support.
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