A novel (Tb0.995Ho0.005)3Al5O12 magneto-optical ceramic with high transparency and Verdet constant

A novel magneto-optical material, (Tb 0.995 Ho 0.005 ) 3 Al 5 O 12 transparent ceramic, was successfully fabricated using co-precipitated powders. The prepared (Tb 0.995 Ho 0.005 ) 3 Al 5 O 12 ceramic exhibits outstanding optical quality and magneto-optical property. For the (Tb 0.995 Ho 0.005 ) 3 Al 5 O 12 ceramic pre-sintered at 1650   °C for 20   h with HIP post-treatment at 1700   °C for 3   h, the optical transmittance exceeds 80% in the 500–1500   nm region (except for the absorption bands). The Verdet constant of the sample at 633   nm is about 1.4 times higher than that of the commercial Tb 3 Ga 5 O 12 single crystal . High transparency and Verdet constant make it an attractive magneto-optical material for the high-power Faraday isolators.