▎ 摘　　要

We report on the measurement of the thermal diffusivity, D, of few-layers graphene obtained by chemical vapor deposition, using a noncontact optical microscopy method based on a mode mismatched thermal lens technique in a pump-probe two-laser beams configuration. It takes advantage of the coaxial counter propagating tightly focused excitation and collimated probe beams in an improved thermal lens microscopy setup. The obtained results: D = (6.5 +/- 0.09) x 10(-4) m(2) s(-1), D = (1.9 +/- 0.07) x 10(-4) m(2) s(-1) and D = (1.3 +/- 0.05) x 10(-4) m(2) s(-1) for four (on a glass slide), eight and sixteen graphene (freestanding) layers are reasonable values, as can be concluded from reported literature data.