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7 October 1996 Nonlinear absorption in modified porphyrins
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We study one free base and seven metallo- octabromotetraphenylporphyrins by several techniques. In a pico-second pump-probe experiment, we monitor the transient transmission of each sample up to 11 ns after it is irradiated by an intense laser pulse. Combined with the results from time-resolved fluorescence spectroscopy, we propose a simple model to interpret the transmission data. We attribute the reduction in the transmission to triplet state absorption and extract the triplet state absorption cross-sections, as well as the lifetimes from the time dependent transmission data. In a separate experiment where the transmission of a nanosecond laser pulse is measured with various input energies, our measurement in the cross- sections predicts the correct optical limiting behavior. We assess the overall optical limiting performance of all 8 samples by direct comparison with C60 at the same ground state transmission.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nansheng Tang, Weigie Su, Thomas M. Cooper, W. Wade Adams, Donna M. Brandelik, Mark C. Brant, Daniel G. McLean, and Richard L. Sutherland "Nonlinear absorption in modified porphyrins", Proc. SPIE 2853, Nonlinear Optical Liquids, (7 October 1996);

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