RARE EARTH SINTERIZED AGGLOMERATE GARNET PIECE.

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A rare earth garnet sintered compact which is produced by subjecting a rare earth garnet powder such as YAG to a pre-sintering, sintering the pre-sintered product by HIP, and annealing the sintered product at 1100 DEG C to 1600 DEG C in a whole oxygen atmosphere under a whole pressure of 4.5 MPa or more, and has an average crystallite diameter of 0.9 to 9 mu m, an optical loss coefficient of 0.002 cm or less and a strain of a transmitted wave of 0.05 lambda cm or less.