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Proceedings Paper

New organic second-order nonlinear optical crystals of benzylidene-aniline derivative
Author(s): Tetsuya Tsunekawa; Tetsuya Gotoh; Hiroshi Mataki; Toshiyuki Kondo; Seiji Fukuda; Masao Iwamoto
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Paper Abstract

The benzylidene-aniline derivative with an electron-donating group at 4-position and an electron-accepting group at 4'-position has been suggested by MO calculation, to have a small molecular dipole moment but a large second-order hyperpolarizability in comparison with those of p-nitroaniline analogous molecules, hence, to be a promising molecule on searching for a new organic crystal with large second-order optical nonlinearity. Chemical modification of the molecule suggested led to a discovery of a series of crystals having high activities in second harmonic generation ( SHG ) ; one of which, 4'-nitrobenzylidene-3-acetamino-4-methoxyaniline ( MNBA ) crystal in monodinic Cc with four molecules per unit cell showed larger powder SHG than 2-methyl-4-mtroaniline ( MNA ) crystal in a preliminary powder SHG experiment. A strongly polarized non-centrosymmetric molecular packing has been achieved in this crystal by the presence of intermolecular hydrogen bond between neighboring acetainino groups. Calculation by an oriented gas model with the use of the detailed structural data from X-ray analysis for the MNBA crystal predicted that the crystal may have up to ca. 2.9 times larger macroscopic optical nonlinearity than MNA crystal. This has been experimentally proven by measuring the d for SHG by Maker fringe method. The largest d coefficient was found to be dii , and the value obtained was 454 pm/V which is 1.8 times larger than d11 of MNA crystal and 13 times larger than of lithium mobate ( ) crystal.

Paper Details

Date Published: 1 December 1990
PDF: 13 pages
Proc. SPIE 1337, Nonlinear Optical Properties of Organic Materials III, (1 December 1990); doi: 10.1117/12.22953
Show Author Affiliations
Tetsuya Tsunekawa, Toray Industries, Inc. (Japan)
Tetsuya Gotoh, Toray Industries, Inc. (Japan)
Hiroshi Mataki, Toray Industries, Inc. (Japan)
Toshiyuki Kondo, Toray Industries, Inc. (United States)
Seiji Fukuda, Toray Industries, Inc. (Japan)
Masao Iwamoto, Toray Industries, Inc. (Japan)

Published in SPIE Proceedings Vol. 1337:
Nonlinear Optical Properties of Organic Materials III
Garo Khanarian, Editor(s)

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