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Nonlinear optical properties and carrier relaxation dynamics in graphene,suspended in three different solvents, are investigated using femtosecond (80fs pulses) Z-scan and degenerate pumpprobe spectroscopy at 790 nm. The resultsdemonstrate saturable absorption property of graphene with a nonlinearabsorption coefficient, $beta$, of ~2 to 9x10^-8 cm/W. Two distinct time scalesassociated with the relaxation of photoexcited carriers, a fast one in therange of 130-330 fs (related to carrier-carrier scattering) followed by aslower one in 3.5-4.9 ps range (associated with carrier-phonon scattering) areobserved.

Femtosecond carrier dynamics and saturable absorption in graphene suspensions