Features of Optical Anisotropy of Terbium Iron Garnet

摘要

The results of investigation of magnetic linear birefringence (MLB) and magnetic linear dichroism of Tb_3Fe_5O_(12) (TbIG) iron garnet on ~7F_6 - ~7F_0 optical transition upon variation of the directions of the magnetization vector I relative to the electric vector E linearly polarized light that propagates through TbIG single crystal are presented. The measurements were made on Tb_3Fe_5О_(12) single-crystal samples in the form of plates 100 μm thick cut in the (110) and (100) plane at the temperatures T = 82 and in a magnetic field H= 20 kOe. The absorption spectra of the linearly polarized light were studied. It is shown that MLB and dichroism in the region of the ~7F_6 - ~7F_0 absorption band reach values 10~(-4). First experimentally discovered nonreciprocity of MLB spectra and dichroism with the change of the relative orientation of the magnetization vector I and the light wave vector. This effect may use as a base for the design of the different transducers, for example, magnetooptical optical channels commutator.