Waveguide magneto-optic isolator fabricated by laser annealing

Ando, Koji; Okoshi, Tokio; Koshizuka, Naoki
July 1988
Applied Physics Letters;7/4/1988, Vol. 53 Issue 1, p4
Academic Journal
A compact waveguide optical isolator whose input and output light are TE or TM mode has been realized by making adjacent nonreciprocal and reciprocal TE-TM mode converters in a (BiGdLu)3(FeGa)5O12 film. Designed configurations of the magnetization directions were produced by making use of local laser annealing of the film grown on a Gd3Ga5O12 substrate of which the face normal is tilted from the [111] axis. The laser-annealed and nonannealed regions worked as the nonreciprocal and reciprocal mode converters, respectively. The observed isolation agreed with theoretical calculation. An isolation ratio of 12.5 dB was achieved at a wavelength λ=1.15 μm.


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