POLYMORPHISM AND CRYSTAL-CRYSTAL TRANSFORMATIONS OF THE HIGHLY OPTICALLY NONLINEAR ORGANIC-COMPOUND ALPHA-[(4'-METHOXYPHENYL)METHYLENE]-4-NITRO-BENZENEACETONITRILE

被引：27

作者：

OLIVER, SN

PANTELIS, P

DUNN, PL

机构：

[1] British Telecom Research Laboratories, Martlesham Heath

来源：

APPLIED PHYSICS LETTERS | 1990年 / 56卷 / 04期

关键词：

D O I：

10.1063/1.103288

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Crystals of α-[(4'-methoxyphenyl)methylene]-4-nitro- benzeneacetonitrile exhibit powder second-harmonic generation (SHG) efficiencies under 1.06 μm irradiation several times that of 2-methyl-4-nitroaniline. We have identified three distinct, solution-grown polymorphs which show marked variation in SHG efficiency. Controlled transformation between these polymorphs can be made either solvent assisted or thermally. One polymorph shows a 25-fold increase in SHG efficiency when the irradiation wavelength is changed to 1.32 μm while the others show a small or no increase.

引用

页码：307 / 309

页数：3

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