Abstract
Electron heating in metals by ultrashort laser pulses has been intensively investigated in recent years.1,2 However, no direct measurements of the electron energy distribution function in laser-heated metals have been reported so far. We have used ultraviolet photoemission spectroscopy to directly obtain the energy distribution function with 500-fs time resolution. We confirm that on this time scale, the distribution is well described by a Fermi-Dirac function; thus we directly measure the time dependence of the electron temperature.
© 1991 Optical Society of America
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