Analysis of Second Harmonic Generation Phase Measurement for Determination of Molecular Orientation and Effective Second Order Nonlinear Optical Constant

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals Pub Date : 2001-10-01 DOI:10.1080/10587250108030055

H. Kimura-Suda, T. Sassa, T. Wada, H. Sasabe

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Abstract

Abstract The average direction of molecules and the absolute value of an effective second order nonlinear optical constant (∣d eff 7∣) were simultaneously determined using a new second harmonic generation (SHG) phase measurement with theoretical curve fitting. The theoretical curve fitting process was demonstrated using poled poly (methyl methacrylate) films doped with p-nitroaniline (PNA/PMMA), which were used as a reference and a sample. The second harmonic (SH) interference generated between the two poled PNA/PMMA films was modulated by rotating the phase generator inserted between the two. The fitting process derived d eff itself. The average direction of molecules was shown by the sign of d eff . The obtained value of ∣d eff ∣ was verified by that from a Maker fringe measurement. The obtained average direction of molecules coincided with that determined by a poling geometry.

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二次谐波相位测量测定分子取向和有效二阶非线性光学常数的分析

摘要采用一种新的二次谐波相位测量方法，结合理论曲线拟合，同时确定了分子的平均方向和有效二阶非线性光学常数(∣d eff 7∣)的绝对值。以掺杂对硝基苯胺(PNA/PMMA)的极性聚甲基丙烯酸甲酯薄膜作为参考和样品，验证了理论曲线拟合过程。通过旋转插在两极性PNA/PMMA薄膜之间的相位发生器来调制两极性PNA/PMMA薄膜之间产生的二次谐波干扰。拟合过程自行推导。分子的平均方向用deff符号表示。用Maker条纹测量的结果验证了所得的值∣d eff∣。所得的分子平均方向与极化几何所确定的方向一致。

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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals

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