OPTICALLY ACTIVE MEDIUM FOR USE AS A FARADAY ROTATOR

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The invention relates to an optically active medium, in particular terbiumoxide crystals, and to a corresponding method for producing same, wherein the optically active medium is composed as follows : -Tb2-xSExO3, where 0 ≤ x ˂ 05, - and where SE is a rare-earth metal : Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu.