Wenderoth, Lind & Ponack
Magneto-optical element and magnetic field measurement apparatus
 The present invention relates to a magneto-optical element which is made of a bismuth-substituted rare earth iron garnet crystal of a formula EQU (Bi.sub.X Gd.sub.Y R.sub.Z Y.sub.3-X-Y-Z) (Fe.sub.5-W Ga.sub.W)O.sub.12, wherein R designates an element selected among rare earth elements, wherein 0.8.ltoreq.X.ltoreq.1.3, 0.1.ltoreq.Y.ltoreq.0.3, 0.1.ltoreq.Z.ltoreq.1.0 and 0.3.ltoreq.W.ltoreq.0.8. The magneto-optical element has a constant sensitivity less than .+-.4.0% between -50.degree. and +100.degree. C. around room temperature. Further, a magnetic field measurement apparatus comprises the magneto-optical element and a light source of a central wavelength in the 0.8 .mu.m band. A magnetic field measurement apparatus with use of the magneto-optical element is stable against temperature change for practical use. 
Matsushita Electric Industrial Co., Ltd.
H C H C H G
H01F C30B H01F C30B H01F G01R
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Hirokazu Nobuki
Yamada Itoh