The measurement of Faraday Effect of translucent material in the entire visible spectrum

A Faraday rotation measurement system with an alternating magnetic field was built to study magneto-optical properties of transparent materials in wide spectrum range (300-1100 nm) with a resolution under 1 nm. An experiment setup was work based on double modulating light technique and the signal was detected by the sensitive balanced polarimetry and it was decoded with precise digital potentiostat. The device is coupled with a mechanical splitter in order to improve precision of measurements and eliminate an electrical artifacts between coils and photodiodes. The apparatus was tested by measuring the wavelength dependence of Verdet constants and the absorbance coefficient for a well-known material - BK-7 glass. In this paper magneto-optical properties of TSAG crystal and Y2O3 translucent ceramic were investigated as a function of temperature in UV-VIS-IR spectrum.