We created and measured properties (the Verdet constant, absorption coefficient, thermooptical constants Q and P relevant to thermally induced depolarization and thermal lens effect) of promising magneto-optical Terbium-Aluminium Garnet (TAG) and Terbium-Hafnium Pyrochlore (THP) ceramics. It is shown that TAG ceramics made by solid-state reaction sintering has smallest absorption coefficient and could work as magnetooptical element in Faraday Isolator (FI) with a kW-class laser power providing 30 dB isolation ratio. So, TAG based Faraday rotators can be successfully used in laser system with high average and peak power.
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