Study of excited-state absorption of C₇₀/toluene solution using time-resolved non-degenerate pump-probe system

The excited-state nonlinearities of the C70/toluene solution are studied using a time-resolved non-degenerate pump-probe system. The 532 nm laser beam with 21 ps duration is used as the excitation and the laser beam of 600 nm with 10 ps duration is used for probing. The parameters associated with the five-energy-level model are evaluated by numerically simulation based on the non-degenerate pump-probe theory. The experimental results demonstrate that the lifetime of the excited state remains unchanged under non-degenerate condition, but the absorption cross section of the first excited state decreases with probe beam wavelength increase.