共查询到20条相似文献,搜索用时 46 毫秒
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利用光自聚焦和F-P腔两种手段,对EBBA液晶进行了光学双稳态研究,实验是在60μm液晶薄膜中采用连续At^+激光器进行了,确定出温度五光学双稳态和多级光学双稳态回线的关系,讨论了EBBA液晶在固态相和液晶相及其相变过程中光学双稳态的机制。 相似文献
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光强调制型光纤传感器,已得到了广泛的应用,它的测量灵敏度,精度和稳定性,主要取决于光源输出功率的稳定性,传统的办法是采用引入参考光路,利用光电补偿方法,来减小光源波动造成的影响,我们提出采用光学双稳装置来稳定光源输出功率,并将它用於折射率调制型光纤传感器测量液体浓度的实验中,本文详细报导了该装置的原理,内容和测量结果,并指出进一步研究方向。 相似文献
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本文中我们对光学双稳系统的慢化现象进行了研究,指出了两类临界点附近的慢化现象(即所谓的临界慢化)并且计算出了它们随时间的慢化指数,进一步我们讨论了另一种远离临界点的慢化现象,这是一种与不稳工作点有关的慢化现象,本文的讨论具有普适性,有些结论与已经在理论和实验讨论过的全光学型的或混合型的双稳系统的慢化现象相一致。 相似文献
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光学双稳态的调制函数和反馈函数构成一组非线性方程,通常用迭代法求解它们,迭代是否收敛取决于初始解选择的恰当与否,为了顺利求解,我们找到了一种新的数值求解非线性方程组的方法,本文还指出可以利用数值求解方法,来寻找新的双稳装置和研究它的性能。这实际是用计算机作光学双稳装置的模拟研究。 相似文献
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本文报道向列相液晶在电场诱导下以及经液晶池界面化学处理后,获得了垂直结构的体系的位相匹配且产生了二次谐波。首次测定该液晶的非线性系数张量的矩阵各分量,并给出诱导场强与谐波强度的关系。 相似文献
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本文报道向列相液晶在电场诱导下以及经液晶池界面化学处理后,获得了垂直结构的体系的位相匹配且产生了二次谐波.首次测定该液晶的非线性系数张量的矩阵各分量,并给出诱导场强与谐波强度的关系. 相似文献
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《Electron Devices, IEEE Transactions on》1971,18(10):959-964
This paper considers the influence of several parameters on the current through a nematic liquid crystal cell. The dependence of the current on the average fieldV/d , whereV is the voltage andd the thickness of the nematic film, does not prove the existence of Schottky emission or field-assisted dissociation. We have measured the electric field distribution in a thick cell containing the nematic. There is an appreciable cathode fall where the electric field is much higher than the average value. Our experiments, made under dc conditions, suggest that the theory of unipolar-injection-induced instability is correct. 相似文献
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Nematic liquid crystals exhibit a saturable nonlinearity, nonlocal in time and in space, owing to light-induced reorientation of the molecular director. In such media, (2 + 1)-dimensional spatial solitons can be obtained at milliwatt-power levels and confine weaker co-polarized signals of different wavelengths, employing either coherent or partially incoherent excitations. Our experimental observations of solitons and related phenomena, ranging from angular steering to mutual interactions, are reviewed. Models are briefly discussed and used to predict and interpret the results. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1976,64(12):1737-1738
The thermal fluctuations in the long-range order of the liquid crystal molecules scatter light strongly. Equations that predict the strength of light scattering under an applied electric field age presented. The field can either decrease or increase the scattering over a large range. The effects of polarization and the direction of light incidence are also considered. 相似文献
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New organic compounds of positive dielectric anisotropy giving nematic liquid crystals at room temperature, either as the pure compounds or in admixture, are described. These materials are of improved stability, and function well in electro-optical devices based on the twisted-nematic or cholesteric-nematic phase-change effects. 相似文献
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用液晶分子运动的动力学方程,求出了激光诱导向列相液晶分子重新取向的取向角、折射率改变、阈值场强和上升时间的近似表达式。讨论了它们随液晶材料参数、激光强度和激光在液晶中传播方向的变化,进行了数值计算。给出了激光能诱导向列相液晶分子重新取向的必备条件,得到向列相液晶的各向异性是其分子重新的取向的根本原因。 相似文献
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《Electron Devices, IEEE Transactions on》1979,26(9):1373-1374
A guest-host cell with small pretilt from homeotropic alignment was made of an Nn-type liquid-crystal and pleochroic dyes. It is shown that this cell displays a colored pattern on a colorless background, country to colour displays of the convential guest-host type. 相似文献