A SPINNING POLARIZER AND SPINNING ANALYZER METHOD FOR VISUALIZING THE ISOCHROMATES IN CONOSCOPIC INTERFEROMETERS

We have developed a spinning polarizer and spinning analyzer (SPSA) method to visualize the whole isochromatic fringes in conoscopic interferometers for the study of optically anisotropic materials. This simple method completely eliminates the broad and dark isogyre fringes appearing in a convention...

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Published inInternational journal of modern physics. B, Condensed matter physics, statistical physics, applied physics Vol. 27; no. 30; pp. 1350175 - 1-1350175-17
Main Authors OLORUNSOLA, OLUWATOBI, DADA, OLUWASEYE, WANG, PENGQIAN
Format Journal Article
LanguageEnglish
Published Singapore World Scientific Publishing Company 10.12.2013
World Scientific Publishing Co. Pte., Ltd
Subjects
Analyzers
Detectors
Electric fields
Interferometers
Isochromatics
Light
Lithium niobates
Polarizers
Spinning
Spinning (materials)
Wave plates
Conoscopic interferometer
isogyre
isochromate
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Summary:We have developed a spinning polarizer and spinning analyzer (SPSA) method to visualize the whole isochromatic fringes in conoscopic interferometers for the study of optically anisotropic materials. This simple method completely eliminates the broad and dark isogyre fringes appearing in a conventional conoscopic interferometer where a linear polarizer and a linear analyzer (LPLA) are used. Our method allows the direct visualization of the isochromates on the viewing screen by eyes in real time, without the need of additional optics or detectors other than those used in a conventional conoscopic interferometer, and no additional computation is required. This method works at any polarization state of the input light, and at any wavelength permitted by the polarizers. In the case of polychromatic illumination our method reveals the isochromates of all colors indiscriminatively, in comparison to the method of circular polarizer and circular analyzer (CPCA), which is considerably subject to spectrum modulation due to the dispersion in the retardation of the quarter-wave plates. The proposed method is demonstrated in a lithium niobate (LiNbO3) crystal driven by an external electric field.
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ISSN:0217-9792
1793-6578
DOI:10.1142/S0217979213501750