When a metal is subjected to pulsed laser heating (pulse width ≤ hot electron energy loss lifetime), a transient inequality between the temperatures of the electrons and the lattice will occur.1 Nonequilibrium electron heating in metals has been observed by picosecond2,3/femtosecond4-6 thermomodulation transmissivity4/ reflectivity,5,6 and thermally enhanced multiphoton. photoemission.7 The femtosecond optical modulation studies have resolved the hot electron relaxation. Unresolved, however, is the role of lattice defects on hot electron energy loss and diffusion.

© 1990 Optical Society of America

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