Abstract
Nonlinear absorption and refraction of C60 dissolved in toluene are investigated using the Z-scan technique with trains of picosecond laser pulses extending over ∼70 nanoseconds. Analysis of the experimental results, with a five-state model, assures contributions of the triplet–triplet absorption and the thermal effect induced by nonradiative relaxation, in addition to the singlet–singlet excitation verified in a previous picosecond study.
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