We have studied several new classes of nonlinear organic material including donor-acceptor substituted pyridines and enones (chalcones and benzylidenes) by second harmonic generation (SHG) in powders with a Nd:YAG laser. Among these, many materials belonging to the 2-substituted-nitropyridine and donor-substituted nitrochalcone families have been found to have SHG efficiencies up to an order of magnitude greater than urea as well as high optical damage thresholds.

© 1982 Optical Society of America

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