Abstract
Supporting the selection of proper materials for a particular application (e.g. measuring the displacement between light spots of different wavelength), a comprehensive algorithm for the optimization of the parameters of a magneto-optical light modulator has been developed and can be used as a guideline. Starting from the known material parameters—complex refractive index n0 and complex magneto-optical constant Q—the optimum angle of incidence and polarization status of the considered light wave and the optimum analyzer angle have to be found in order to attain the maximum signal-to-noise ratio (SNR) at the detector output. The theory is formulated in terms of the Fresnel coefficients and gives the solution for the three fundamental effects (longitudinal, polar, and transverse). The simple case of the polar Faraday-effect can be solved analytically, otherwise only a numerical calculation is possible. Finally, the suitability of the derived algorithm is proved by comparing the calculated results with some particular measurements on an iron film.
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