PARAMAGNETIC GARNET-BASED TRANSPARENT CERAMIC AND METHOD FOR PRODUCING SAME

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A sintered body of Tb-containing rare earth aluminum garnet represented by formula (1) (Tb1-x-yYxScy)3(Al1-zScz)5O12 (1) (where 0 < x < 0.45, 0 < y ≤ 0.1, and 0.004 < z < 0.2), wherein : |a - b| ≤ 0.1 when at least 900 nm < λ < 1, 100 nm, where, in terms of a total light transmittance spectrum on an optical path length of 24 mm, a% is the total light transmittance at the wavelength 900 nm and b% is the total light transmittance at any wavelength λ more to the long-wavelength side than 900 nm; and no thermal lensing effect is produced even with respect to a 100-W laser output, allowing for use as a Faraday rotator of a high-power fiber laser.