Abstract
We report on a novel organic chromophore with symmetric twistedintramolecular charge transfer (TICT) state on excitation. Theproperties of nonlinear transmission induced by three-photon absorption(3 PA) are demonstrated pumped with nanosecond laser pulse. Large 3 PAcross sections as high as the order of 10−74 cm6s2 havebeen obtained for nanosecond and picosecond laser pulses at 1064 nmfrom intensity-dependent transmission measurements. Similar two emissivebehaviours from one-photon and three-photon excited fluorescence spectraindicate that the linear and nonlinear fluorescences share the same TICTrelaxation process from the excited states. The intensity dependence ofupconversion fluorescence on the incident intensity obeys the cubic lawthat characterizes the three-photon absorption.
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