Mr. Yupeng Zhang Profile

Yupeng Zhang

at Soochow University

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Proceedings Article | 28 February 2017 Paper

Effect of polarizer parameters on measuring Verdet constant of magneto-optical glass

Yupeng Zhang, Baoxing Xiong, Xiao Yuan, Guiju Zhang, Kuaisheng Zou

Proceedings Volume 10256, 102565Y (2017) https://doi.org/10.1117/12.2256241

KEYWORDS: Polarizers, Glasses, Optical testing, Mineralogy, Error analysis, Magneto-optics, Optical power meters, MATLAB, Helium neon lasers, Light sources

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The traditional measurement for Verdet constant of magneto-optic glass is to measure the Faraday rotation angle indirectly by using optical power meter, which is based on the Faraday rotation effect. There is a relatively large measurement error, because the method neglects the influence of the extinction ratio of polarizer and the axis angle. In our research, a method based on Jones matrix and simulation is studied and used to improve the measurement accuracy. The extinction ratio of polarizer and the axis angle are discussed during the measurement. The experiment system is built for measuring the Verdet constants of ZF7 glass and Ce³⁺/Tb³⁺ co-doped glass, by using the He-Ne laser light source, and different polarizers. The results show that the changes of the polarizer’s extinction ratio mainly affected the Verdet constant measurement. The lower extinction ratio, the larger measurement error. The extinction ratio more than 1:1000 for the polarizer is necessary for an accurate measurement, which has important value in terms of reference and guidance for the accurate measurement of Verdet constant of magneto optic glass.

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