Abstract
The phenomenon of inequality between electron and lattice temperatures in metals subjected to ultrafast heating (laser pulse width ≤ electron-phonon energy relaxation time) was postulated some time ago.1 However, very few experimental observations of such inequality have been accomplished. In an experimental observation of pico- second (~5-ps FWHM) tlme-resolved reflectivity of copper during laser heating of up to a few degrees, a fast transient was observed by Eesley.2 This observation was interpreted to be due to rapid electronic heating which subsequently thermalizes with the lattice. In an experiment by Fujimoto et al.,3 thermally enhanced multiphoton photoemission in tungsten heated by amplified 75-fs laser pulses has provided evidence of nonequilibrium heating. We report results on thermomodulation transmissivity of thin copper films heated by amplified 150-fs laser pulses, which were sufficient to time resolve th6e initial fast transient.
© 1986 Optical Society of America
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