Synthesis of Organic Salts with Large Second-Order Optical Nonlinearities

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Science  02 Aug 1989:
Vol. 245, Issue 4918, pp. 626-628
DOI: 10.1126/science.245.4918.626


A series of organic salts, in which the cation has been designed to have a large molecular hyperpolarizability, has been prepared. Variation of the counterion (anion) in many cases leads to materials with large powder second harmonic generation efficiencies, the highest of which is roughly 1000 times that of a urea reference.

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