Abstract
A method of measuring the peak value of the Faraday rotation ΦF (hereafter referred to as the dynamic Faraday rotation) induced by an alternating magnetic field is described. It requires accurate measurement of the fundamental and the second harmonics of the photodetector currents. The sample is a (BiPrGdYb)3(FeAl)5O12 magneto-optic garnet film prepared by liquid phase epitaxy. Using the presented method, we successfully measured the dynamic Faraday rotation in the garnet film at the near infrared wavelength 1.55 μm of the light beam. The result shows that Faraday rotation induced by an alternating magnetic field is proportional to ac current and decreases with increasing ac frequency. The method is simple, general, accurate, and can be used at any ac frequency. Experimental errors in our measurement are analyzed and an accuracy better than 2% can be obtained. Finally, some of the factors which may influence the measurement results are discussed.
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