Abstract
Abstract We report on optical limiting mechanisms in C60/toluene solutions over a wide range of laser fluences. Nonlinear absorption in C60 can be modeled by reverse saturable absorption. However, our optical limiting experiments are sensitive to additional optical loss mechanisms. We observe thermally induced beam distortions, luminescence, and photo-decomposition. At high fluences many materials form plasmas and exhibit very strong optical limiting. However, C60/toluene does not form a plasma even for incident energies 40 times the plasma threshold in pure toluene. At these high incident energies, 5 mJ, we do see a laser induced reaction of the solution with the Pyrex cuvette, etching of the Pyrex, and numerous organic products.
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