Optical limiting behaviour of suspensions of single-walled carbon nanotubes in water, ethanol and ethylene glycol is reported. Experiments with 532 nm, 15 nsec duration laser pulses show that optical limiting occurs mainly due to nonlinear scattering. The observed host liquid dependence of optical limiting in different suspensions suggests that the scattering originates from microbubbles formed due to absorption-induced heating.

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Results of experimental and theoretical investigation of optical limiting for 30 ns pulses at 527 nm in C60 are presented which suggest that apart from higher excited state absorption, other nonlinear processes may have an important role in the experimentally observed limiting action.

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