A measurement of the variation of the Verdet constant of terbium gallium garnet as a function of temperature was made for visible and near-infrared wavelengths. By combining results of the angle of rotation presented here with previously published absolute measurements, we determined the Verdet constant as a function of wavelength for wavelengths extending from about 0.5 to 1.1 μm. Data correlated well with paramagnetic models. Such information is necessary to determine the angle of rotation as well as the variation of the extinction ratio of a Faraday isolator with temperature.
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