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Channelled spectrum method for birefringence dispersion measurement of anisotropic Mylar film

机译：各向异性聚酯薄膜双折射色散的通道光谱法

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摘要

A convenient and accurate interferometric technique for measuring the birefringence dispersion of anisotropic Mylar film according to a continuous spectral range of wavelengths in the ultraviolet, visible and near infrared region, using the so called "Channelled Spectrum" method is described. The technique proposed here consists of considering all the experimental data, not only the minima of the transmitted light obtained after recording the transmitted light that travelled a Mylar film sandwiched between two crossed polarizers. Furthermore, we are able to measure the transmission coefficients of the polarizers, the absorption of the Mylar sheet, and other parameters involved in the experiment by using a spectroscopic detection. Thus, the transmission of the Mylar sheet vs wavelength is deduced. Using the dispersion of the optical birefringence given by the birefringence dispersion theory for uniaxial organic compounds ie the one band, three-band, and Cauchy models, and by applying a nonlinear fitting procedure on the recorded experimental data, we have obtained the parameters involved in the expressions of the optical birefringence and we have computed the optical birefringence of the Mylar film vs wavelengths. In the visible and near-infrared regions, all models give excellent fits to the experimental data. In the UV region, the three-band model considers the resonance effect. Thus, in the near-resonance region the results from the three-band model are more accurate. (C) 2016 Elsevier B.V. All rights reserved.
机译：描述了一种方便准确的干涉技术，该技术使用所谓的“通道光谱”方法，根据紫外线，可见光和近红外区域中波长的连续光谱范围来测量各向异性聚酯薄膜的双折射色散。这里提出的技术包括考虑所有的实验数据，不仅是在记录透射过夹在两个交叉偏振器之间的聚酯薄膜的透射光之后获得的透射光的最小值。此外，我们能够通过光谱检测来测量偏振器的透射系数，聚酯薄膜的吸收率以及实验中涉及的其他参数。因此，得出了聚酯薄膜片的透射率与波长的关系。使用双折射色散理论给出的单轴有机化合物的双折射色散的色散，即一个带，三个带和柯西模型，并通过对记录的实验数据应用非线性拟合程序，我们获得了涉及的参数。光学双折射的表达式，我们已经计算了聚酯薄膜的光学双折射与波长的关系。在可见光和近红外区域，所有模型都非常适合实验数据。在紫外线区域，三波段模型考虑了共振效应。因此，在近共振区域，三频带模型的结果更加准确。 （C）2016 Elsevier B.V.保留所有权利。

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