Application of Bi-substituted iron garnet films to 0.8 .MU.m Range optical isolator.

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Abstract
High-quality films of (BiNdLu)3(FeAlLu)5O12 and (BiGd)3(FeAl)5O12 have been grown by means of LPE. We found that Bi garnet films with the absorption loss of 300∼400dB/cm at wavelength 0.8μm can be prepared by this technique with use of PbO-B2O3-Bi2O3, fluxed melts. The magneto-optical figure of merit of (BiGdLu)(FeAlLu)5O12 films reached about 10 deg/dB at 0.8 μm for as-grown films and 14 deg/dB for chemically reduced films in aqueous FeCl2 solution. Films of (BiGd)3(FeAl)5O12 of thickness greater than 100μm and a figure of merit of 9 deg/dB are successfully grown onto NdGG and Ca, Mg and Zr substituted GGG substrates. From the temperature dependence of Faraday rotation angle of the film, it is found that the Curie temperature is 300°C and the compensation temperature, -98°C An optical isolator for a wavelength region of 0.8μm is constructed by using the thick film which have the perpendicular and low saturation magnetization (4πMs=603 G). The forward loss of the isolator is found to be 6.3dB and the backward loss, 24 dB.

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