Jx Nippon Mining Metals Corporation

Mikami Makoto

Yoshiki Yamazaki

Murakami Masaomi

Murakami Kouji

Imori Toru

A polycrystalline YAG sintered body, wherein, when dimensions of a smallest rectangular solid surrounding a YAG sintered body are A mm&#xd7;B mm&#xd7;C mm, a maximum value (A, B, C) is 150 mm or less, a minimum value (A, B, C) is more than 20 mm and 40 mm or less, and an optical loss coefficient when light of a wavelength of 300 to 1500 nm (excluding wavelengths which result in absorption of light by an additive element) is transmitted therethrough is 0.002 cmor less. Moreover, a polycrystalline YAG sintered body, wherein, when dimensions of a smallest rectangular solid surrounding a YAG sintered body are A mm&#xd7;B mm&#xd7;C mm, a maximum value (A, B, C) is more than 150 mm and 300 mm or less, a minimum value (A, B, C) is more than 5 mm and 40 mm or less, and an optical loss coefficient when light of a wavelength of 300 to 1500 nm (excluding wavelengths which result in absorption of light by an additive element) is transmitted therethrough is 0.002 cmor less. An object of an embodiment of the present invention is to provide a large and transparent polycrystalline YAG sintered body and its production method.

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Ibaraki, Japan

Mikami Makoto