Paramagnetic garnet-type transparent ceramic, magneto-optical device, and method for producing paramagnetic garnet-type transparent ceramic

The present invention relates to a paramagnetic garnet-type transparent ceramic having a high laser damage threshold, which is a sintered body of a Tb-containing rare earth aluminum garnet represented by formula (1), and which is characterized by having an average sintered particle diameter of 10-40 [mu] m and an insertion loss of 0.05 dB or less at a wavelength of 1064 nm in an optical effective region in the longitudinal direction of a sample having a length of 20 mm. (Tb1-x-yYxScy) 3 (Al1-zScz) 5O12 (1) (In the formula, 0 < = x < 0.45, 0 < = y < 0.08, 0 < = z < 0.2, 0.001 < y + z < 0.20). ). 本发明涉及激光损伤阈值高的顺磁性石榴石型透明陶瓷，其为由下述式(1)表示的含有Tb的稀土铝石榴石的烧结体，其特征在于，平均烧结粒径为10μm以上且40μm以下，在长度20mm的试样的长度方向上光学有效区域内的波长1064nm的插入损耗为0.05dB以下。(Tb1-x-yYxScy)3(Al1-zScz)5O12(1)(式中，0≤x＜0.45、0≤y＜0.08、0≤z＜0.2、0.001＜y+z＜0.20。)。