Abstract
The use of second-harmonic generation (SHG) as a surface-specific probe of centrosymmetric materials has been well established over the past 25 years. However, although much of our understanding of SHG from liquids, semiconductors, and insulators remains at a phenomenological level SHG from dean metal surfaces holds a basic fascination because of the possibility of comparing experimental results with more fundamental theories. Nevertheless, until recently convergence of experimental and theoretical results has not occurred, because of unrealistic models of the surface electron potential on the theoretical side or because of the use of oxidized or other nonideal surfaces on the experimental side.
© 1992 Optical Society of America
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