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MEASUREMENTS OF THE TRIPLET STATE NONLINEARITY OF C60 IN TOLUENE USING A Z-SCAN TECHNIQUE WITH A NANOSECOND LASER

Triplet state nonlinearity of C60 in toluene is studied using the Z-scan technique with 8 ns, 532 nm pulses from a Q-switched Nd:YAG laser. Compared with the Z-scan results of C60 in toluene and iodine in toluene with proper concentration, the solvent instantaneous nonlinearity and the thermal nonlinearity resulting from the C60 intersystem crossing and excited state absorption are estimated. The real part of the C60 triplet state molecular polarizability is obtained.