26 July 2011 Methods for determination of the main refractive indices of anisotropic layers
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Proceedings Volume 8001, International Conference on Applications of Optics and Photonics; 80012I (2011) https://doi.org/10.1117/12.888339
Event: International Conference on Applications of Optics and Photonics, 2011, Braga, Portugal
Abstract
When light propagates parallel to a main direction different from the optical axis, the main refractive indices corresponding to the ordinary and extraordinary radiations are determined with a Rayleigh interferometer from the phase difference between the radiation crossing the anisotropic layer (placed in the measure beam) and one isotropic layer (placed in the comparison beam). The two main indices are measured by using linearly polarized light with electric field intensity successively oriented parallel and perpendicular to the optical axis of the anisotropic layer. For incidence angles different from zero two refractive indices are measured: the refractive index for the ordinary radiation and that for the effective radiation. The effective value of the refractive index was determined from the equation of the refractive indices surfaces. Quartz from Maramures area and liquid crystalline layer were used as uniaxial samples. The birefringence of the liquid crystalline layer was modified by varying the intensity of the external electrostatic field. An increase of the birefringence was evidenced when the intensity of the electrostatic field increased.
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C. F. Dascalu, C. F. Dascalu, B. C. Zelinschi, B. C. Zelinschi, D. O. Dorohoi, D. O. Dorohoi, } "Methods for determination of the main refractive indices of anisotropic layers", Proc. SPIE 8001, International Conference on Applications of Optics and Photonics, 80012I (26 July 2011); doi: 10.1117/12.888339; https://doi.org/10.1117/12.888339
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