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The operation of an optical modulator based on the time-varying optical Faraday rotation produced by the precessing magnetization in a magnetic material is analyzed, and experimental results given for an X-band modulator using a thin disk of yttrium iron garnet. The analysis is valid for both lumped and traveling-wave magneto-optical interactions, and leads to a figure of merit on the basis of which some presently available ferrimagnetic materials are compared.
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L.K. Anderson (1963) studied this question.
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