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The transparent film containing a kind of polymer cholesteric liquid crystal-R was fabricated by the freezing method. The optical polarization response of the film was investigated by a self-manufactured apparatus and its optical rotatory dispersion was measured by a novel technique at the wavelength from 35Onto to 66Onto.At various wavelengths, the chiral parameter of the film has been obtained. The results show that the chiral parameter decreases as the wavelength increases. The maximum and minimum chiral parameters are 0.0343 at the wavelength of 350 nm and 0.0058 at the wavelength of 660 nm, respectively. The obtained data indicate that this kind of polymer cholesteric liquid crystal-R is a promising candidate host material for solid optical chiral waveguides. 相似文献
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应用局部耦合模理论,对非对称臂宽带光纤耦合器熔锥的形成及耦合发生过程作了较为精确的分析,计算得出了这类耦合器的熔锥特性曲线及光谱特性曲线,本文理论的进一步简化可得到一个特例,它与其它文献所用理论一致 相似文献
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针对粉末倍频测试过程中的信号溢出,根据Kurtz理论和聚合物分散型液晶薄膜(polymer dispersed liquid crystal,简称PDLC)的透光率对所加电场电压的响应原理,提出PDLC调制入射基频光强,进而控制测试信号的溢出。利用这一方法分别对碘酸钾、钒酸铯和钒酸铷等几种粉末样品的非线性倍频效应进行了测试分析。计算分析结果为:碘酸钾能够实现相位匹配,钒酸铯和钒酸铷不能实现相位匹配;钒酸铯、钒酸铷的倍频效应分别约为氘化磷酸二氢钾(DKDP)的8.13倍和1.78倍。结果表明,使用PDLC调制法所得的测试结果准确且操作简便。更重要的是,此方法应用于定量测试倍频系数中,可以有效提高测试精确度,并且可应用于其他晶体非线性特性的测试研究。 相似文献
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Chiral molecules griseofulvin were disseminated homogeneously in poly methyl metahcrylate (PMMA) host, which agglomerate from methyl metahcrylate and N, N-dimethyl formamide dimethyl acetal, using benzoyl peroxide as a catalyst. So the chiral organic glass has been manufactured successfully. Its optical rotatory were investigated from a solution state to a solid state. The results of measurement show that the chiral parameter of the chiral organic glass is 2.65×10^{-7} and its specific rotation has increased compared with its solution condition. Its infrared spectra property has been measured by Fourier transformation infrared spectrometer. The results show that the chiral molecules fill in the pore of the network structure in the organic glass, which hardly link with the host. 相似文献
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基于氯酸钠晶体的各向同性和旋光色散特性,利用线偏振光以Brewster角内反射时P分量反射率为零的特性,研制出一种新型内反射旋光光学滤波器,该光学滤波器仅需采用单个偏振片,即可达到良好的滤波效果.利用Mueller矩阵对该滤波器的滤波特性进行理论分析以及实验测试,结果表明对含有532 nm和632.8 nm谱线的线偏振光,改变起偏器角度即可连续调制出射红、绿光的光强,当起偏器较初始位置旋转过133.36°和173.06°时,绿光和红光分别消光,绿光和红光的隔离度可达10 dB.
关键词:
光学滤波器
各向同性
旋光色散
偏振 相似文献
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基于飞秒激光双光子聚合微加工技术,利用负光刻胶刻蚀方法制备了内部镂空特殊结构的微电极光刻胶样品,并结合剥离法成功制备了一种镀银的金属微电极,最后利用直通管将微电极进行封装,测试了当直通管填充不同的介质(空气、丙酮、水)时微电极的电容变化值.实验结果表明,所制备微电极样品的电容值与介质的介电常数成正相关,实测值与理论计算值的变化趋势一致. 相似文献
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在室温300K和低温77K下对掺钕光纤放大的自发辐射ASE光源作了实验研究,发现用820纳米光泵浦时,在同等泵浦功率下,浸在液氮中的ASE功率是其在室温下的2倍以上,用830纳米光泵浦时,浸在液氮中的ASE中心波长将红移18纳米。 相似文献