Optical, nonlinear optical, and electrooptical properties of 4'-nitrobenzylidene-3-acetamino-4-methoxyaniline (MNBA) crystals
Optical, nonlinear optical, and electrooptical properties of 4'-nitrobenzylidene-3-acetamino-4-methoxyaniline (MNBA) crystals
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4-硝基亚苄基-3-乙酰氨基-4-甲氧基苯胺 (MNBA) 晶体的光学、非线性光学和电光性质
DOI：
10.1109/3.303688
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发表时间：
1994
影响因子：
2.5
通讯作者：
P. Günter
中科院分区：
文献类型：
--
作者：
G. Knopfle;C. Bosshard;R. Schlesser;P. Günter
研究了4‘-nitrobenzylidene-3-acetamino-4-methoxyaniline(MNBA)单晶的光学、非线性光学和电光PG特性。用干涉法测定了514-1064 nm波长范围内的折射率。利用相位调制技术测量了电光系数r/sub11/、r/sub13/、r/sub31/和r/sub33/。最大电光系数r/sub11/(=29 pm/V at/spl lambda/=633 nm)的色散符合理论上的二能级模型。利用标准Maker条纹技术，我们测定了它们的非线性光学极化率。在/SPL波长为1064 nm处，d/sub11/=175 pm/V处的系数最大。用电场诱导二次谐波方法测定了分子的二阶非线性光学极化率，与分子气体模型中沿分子轴电荷转移的最大非线性光学系数和电光系数进行了比较，得到了较好的定量一致性。在带边附近进行了电吸收测量，使我们能够计算场诱导的主要振子的频移。这种场致频移与由电场引起的折射率变化(电光效应)计算出的频移具有相同的数量级。>；
Optical, nonlinear optical, and electrooptical pg-properties of 4'-nitrobenzylidene-3-acetamino-4-methoxyaniline (MNBA) single crystals have been investigated. The refractive indices were determined in the wavelength range of 514 to 1064 nm using an interferometric method. The electrooptical coefficients r/sub 11/, r/sub 13/, r/sub 31/, and r/sub 33/ were measured using a phase modulation technique. The dispersion of the largest electrooptical coefficient, r/sub 11/ (=29 pm/V at /spl lambda/=633 nm), was seen to follow the theoretical two-level model. Using the standard Maker fringe technique, we determined the nonlinear optical susceptibilities. The largest coefficient was found to be d/sub 11/=175 pm/V at /spl lambda/=1064 nm. Electric-field-induced second-harmonic generation was used for the determination of the molecular second-order nonlinear optical susceptibility yielding a good quantitative agreement when compared with the largest nonlinear optical and electrooptical coefficients in the framework of the molecular gas model with charge transfer along the polar molecular axis. Electroabsorption measurements near the band edge were performed that allowed us to calculate the field-induced frequency shift of the dominant oscillator. This field-induced frequency shift is of the same order of magnitude as the frequency shift calculated from the electric field-induced changes of the refractive indices (electrooptical effect). >