Optical isolator

Details Optical isolator Optical isolator

1992-01-16

1993-03-30

Arnold, Bruce Y.

Optical: systems and elements

Optical modulator

Having particular chemical composition or structure

359282, 359484, 252 6257, G02F 100, G02F 109, G02B 530, H01F 100

Patent

active

051989239

ABSTRACT:
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 (Tb.sub.1-(a+b) Ln.sub.a Bi.sub.b).sub.3 (Fe.sub.1-c M.sub.c).sub.5 O.sub.12 wherein Ln represents at least one element selected from the group consisting of rare earth elements other than Tb; 0<a.ltoreq.0.6; 0<b .ltoreq.0.2; M represents at least one element selected from the group consisting of Al and Ga; and 0.ltoreq.c<0.1; or the formula (Tb.sub.1-(d+e+b) Ln.sub.d Eu.sub.e Bi.sub.b).sub.3 (Fe.sub.1-c M.sub.c).sub.5 O.sub.12 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.ltoreq.0.2; 0<d+e.ltoreq.0.6; 0<b.ltoreq.0.2; M represents at least one element selected from the group consisting of Al and Ga; and O.ltoreq.C<0.1; or the formula (Y.sub.1-(a+b) Ln.sub.a Bi.sub.b).sub.3 (Fe.sub.1-(c+d) M.sub.c Ti.sub. d).sub.5 O.sub.12 wherein Ln represents at least one element selected from the group consisting of Er, Tm, Yb and Lu; 0<a.ltoreq.0.4; 0<b.ltoreq.0.1; M represents at least one element selected from the group consisting of Al and Ga; 0.ltoreq.c.ltoreq.0.1; 0.ltoreq.d.ltoreq.0.01.

REFERENCES:
patent: 3516726 (1970-06-01), Dillon, Jr.
patent: 4604577 (1986-08-01), Matsumura et al.
patent: 4932760 (1990-06-01), Arii et al.
patent: 4981341 (1991-01-01), Brandle, Jr. et al.

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