Abstract
ABSTRACT A nonlinear optical technique based on second harmonic generation (SHG) is introduced to probe the tranient temperature jump induced by pulsed laser excitation of a metal surface. This technique is surface sensitive, nonintrusive and has time resolution limited only by the probe laser pulsewidth. For the Ag(1 10) surface, a strong temperature dependence of SHG enhanced by interband transitions is observed, and is used to detect a > 1010 K/sec heating rate induced by a nanosecond IR excitation pulse. A much strongertemperature dependence is also observed in the SHG resonantly enhanced by a surface statetransition on Ag(1 10) and can in principle be used for surface temperature measurements.This kind of surface temperature measurement method can be generally applied to metals,semiconductors and solids that have temperature dependent electronic transitions.I. INTRODUCTION Exact knowledge of the surface temperature during a surface process is essential forthe correct interpretation of observed phenomena and for the accurate extraction of
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