Abstract
N-(4-nitro-2-pyridinyl)-phenylalaninol (NPPA) was first proposed by Nicoud and Twieg1 as a potentially interesting nonlinear-optical material in 1987. Its powder efficiency is 130 × urea. A molecule is shown in Fig. 1. We have determined the crystal structure from the linear and nonlinear-optical properties of NPPA.
© 1991 Optical Society of America
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