Dr. YouAn Xu Profile

Dr. YouAn Xu

at Xi'an Research Institute of High Technology

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Proceedings Article | 17 May 2019 Paper

Temperature field and influence analysis of magneto-optical modulation system

Wei Cai, Youan Xu, Zhiyong Yang

Proceedings Volume 11170, 111702Y (2019) https://doi.org/10.1117/12.2533776

KEYWORDS: Magneto-optics, Temperature metrology, Modulation, Magnetism, Dielectrics, Copper, Systems modeling, Thermal effects, Signal attenuation, Thermal modeling

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In the actual operation of the magneto-optical modulation system based on the Faraday effect, the internal temperature change will cause the drift of the Faraday rotation angle signal, which is a key problem that further improves the accuracy of the system. In this paper, the system heat transfer model is constructed by in-depth analysis of the system heat generation mechanism. Then the finite element simulation software is used to establish the equilibrium process of the system temperature field, and the internal temperature change of the magneto-optical material is analyzed. Finally, the typical paramagnetic material TGG is taken as an example. Analyze the effect of temperature changes on the Faraday rotation angle and the accuracy of the magneto-optical modulation system. The results show that with the increase of working time, the internal temperature of the system gradually increases, causing the attenuation of the magnetic field amplitude and the decrease of the Verdet constant of the magneto-optical material. Both of them work together on the solution of the Faraday rotation angle, which ultimately affects the overall accuracy of the magnetooptical modulation system.

Proceedings Article | 15 November 2018 Paper

Wave-transition contribution to the Faraday effect and Verdet constant

Wei Cai, Zhiyong Yang, Junhui Xing, Youan Xu

Proceedings Volume 10964, 109644H (2018) https://doi.org/10.1117/12.2506102

KEYWORDS: Electrons, Magnetism, Molecules, Magneto-optics, Quantum physics, Clouds, Data modeling, Crystals, Polarization, Polarizability

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Verdet constant is one of the key parameters to characterize the material's magneto-optical properties, along with the wavelength and temperature dependence. In order to thoroughly analyze the influence mechanisms of the incident wavelength and temperature on the Verdet constant as well as uncover its essence, both advantages and disadvantages of the classical electronic dynamics theory and quantum theory on account of basic theories and test data are discussed. By exploring the physical essences and models of the two theories, their significant associations between the medium’s polarization intensity and the molecular polarizability are determined. The former decides the medium’s permittivity and refractivity, and in turn, influences the Faraday rotation angle and Verdet constant. It should be noted that the polarizability includes not only those transition dipole moments from the electrons’ transitions between different states, but also the inductive dipole moments which is due to the non-transition electron cloud being polarized. Hence, a hypothesis is proposed which suggests that the Faraday effect results from the combination of various factors. Accordingly, a theory of wave-transition contribution to the Verdet constant is deduced. Taking the typical diamagnetic material ZF1 and the typical paramagnetic material TGG as examples, the influences of the incident wavelength and the temperature on the Verdet constant are analyzed. The deduced theory together with the corresponding models is tested and verified by analyzing the relevant parameters and the test data. The results show that the wave-transition contribution theory and its models are superior in the aspect of precisely describing the material's Verdet constant.

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