| 摘要 |
The optical isolator of the present invention comprises a polarizer, a Farady rotator and an analyzer arranged in this order, wherein the Farady rotator has a garnet crystalline structure represented by the formula (Tb1-(a+b) LnaBib)3 (Fe1-cMc)5O12 wherein Ln represents at least one element selected from the group consisting of rare earth elements other than Tb; 0<a</=0.6; 0<b </=0.2; M represents at least one element selected from the group consisting of Al and Ga; and 0</=c<0.1; or the formula (Tb1-(d+e+b) LndEueBib)3 (Fe1-cMc)5O12 wherein Ln represents at least one element selected from the group consisting of rare earth elements other than Tb and Eu; 0<d<0.6; 0<e</=0.2; 0<d+e</=0.6; 0<b</=0.2; M represents at least one element selected from the group consisting of Al and Ga; and O</=C<0.1; or the formula (Y1-(a+b) LnaBib)3 (Fe1-(c+d) McTi d)5O12 wherein Ln represents at least one element selected from the group consisting of Er, Tm, Yb and Lu; 0<a</=0.4; 0<b</=0.1; M represents at least one element selected from the group consisting of Al and Ga; 0</=c</=0.1; 0</=d</=0.01.
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