Search

Research was conducted to examine the refractive indices of the optically nonlinear organic crystal (S)-3-methyl-5-nitro-N-(1-phenylethyl)-2-pyridinamine. The refractive indices were measured from 480 to 660 nm and fitted to four-parameter Sellmeier equations with an accuracy of +/-3 x 1/10 to the 3rd power to +/-5 x 1/10 to the 3rd power. The values of the n(sub x), n(sub y) and n(sub z) refractive indices at 532 nm were found from the Sellmeier equations to be 1.690, 1.901 and 1.725, respectively.

The organic crystal (S)-3-methyl-5-nitro-N-(1-phenylethyl)-2-pyridinamine that were previously identified by the powder technique as a promising nonlinear optical material, the large single crystals (3 * 3 * 2 cm(super 3)) of which is grown by temperature lowering of a seeded supersaturated solution in acetone is reported. Refined refractive indices are obtained from the predicted angles of incidence of the phase-matched second harmonic signals.