Nonequilibrium electron distribution in copper films is induced under femtosecond laser irradiation. The ultrafast electron dynamics is studied by pump and supercontinuum white light probe technique of transient reflectivity. Measurements of thin films with two thicknesses in the range of electron ballistic length are conducted. We observed faster rise and longer tailing of electron dynamics trace in thinner film, in contrast to results of some previous studies, which could be attributed to weak heat transfer across the interface induced by glass substrate.
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