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Time-resolved second-harmonic study of femtosecond laser-induced disordering of GaAs surfaces

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Abstract

An abrupt (less than 100 fs) decrease in the second-harmonic intensity reflected from the surface of a GaAs (110) wafer has been observed experimentally. The linear reflectivity was found to increase on a time scale of ~1 ps. Thus the concept of fast atomic disorder induced by electronic excitation within a relatively cold lattice is given new experimental support.

© 1991 Optical Society of America

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