Very large energy exchange (more than 97%) between TE and TM modes of YIG : Tb,Al guides have been obtained for short propagation lengths (less than 2 mm) in the near infrared (1.152 μm). These performances are better than those of YIG : Gd,Ga layers (97% in 4 mm). With such guides we can reduce M.O. device dimensions; they can be used in the integrated magneto-optics. Also high nonreciprocal conversions (9% conversion in one propagation direction and 93% in the opposite direction) have been obtained in YIG : Gd,Ga films. A nonreciprocity theory is discussed for monosection uniform waveguides. This theory shows that the guides in which we obtained the nonreciprocity cannot be monosection but multisections.
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Torfeh et al. (1978) studied this question.