Refractive-index dispersion of magnetic garnet films of composition (YSmLuCa)3(GeFe)5O12 is reported in a wavelength range of 0.55–1.5 μ. The dispersion was calculated from the film’s optical interference data and thickness value which was accurately determined by the technique of thin-film optical waveguide measurement. The calculated index values at the interference fringe locations were fitted to a two-term Sellmeier formulation. The accuracy was estimated to be better than 0.3%.
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Min‐Yu Sun (1978) studied this question.