Shin-Etsu Chemical Co., Ltd.

Toshihiko Ryuoh

Norifumi Yoshida

Susumu Sakaguchi

Masaaki Iguchi

Masahiro Ogihara

Kazuyoshi Watanabe

In the crystal growing of GGG (gadolinium gallium garnet) by the Czochralski technique from a melt of the oxide mixture of gadolinium and gallium, zinc is added to the oxide melt as a dopant element in a limited amount so that the danger of crack formation in the grown single crystals can be greatly decreased contributing to the improvement of the productivity. Moreover, the GGG single crystal grown with zinc doping has remarkably reduced light absorption in the wavelength region of around 300 nm responsible to the yellowish tint of the crystals.

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Gunma, Japan

Toshihiko Ryuoh