Abstract
A new technique of nonlinear spectroscopy in highly absorbing media is demonstrated for polydiacetylenes. Third harmonic of a Nd : YAG laser is generated and measured by interference between two Langmuir-Blodgett multilayers of polymer. The intensity recorded after two 2700 Å thick multilayers is comparable to that obtained from a CaCO 3 1.91 mm thick phase matched crystal.
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