Abstract
The spectra of the luminescence and magnetic circular polarization of luminescence in terbium–gadolinium gallium garnet Tb3+:Gd3Ga5O12 (Tb3+:GGG) were studied within the visible spectral range at temperatures T=90 and 300K in an external magnetic field of 0.45T. The Zeeman effect in the luminescence “green” band associated with 4f→4f transition 5D4→7F5 of Tb3+:GGG was also studied at T=90K in an external field of 0.55T. Measurement of the Zeeman effect in Tb3+:GGG carried out for some doublet lines of the luminescence band 5D4→7F5 at T=90K shows that a magnetooptical effect of the intensity change of the emitted light is observed on these lines, in contrast to pure Zeeman splitting of the emission lines measured in the luminescence band 5D4→7F6. For the systems we have studied, the maximal value of the magnetooptical effect of the intensity change of the luminescence line at low temperatures has been achieved in paramagnetic garnet Tb0.2Y2.8Al5O12 at comparatively low magnetic fields.
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