We have fabricated the highly concentrated Nd:Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> single crystals, and investigated the spectroscopic properties of them. It was also found that Nd:Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> is essentially a disordered crystal, because all Gd<sup>3+</sup> ions in Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> crystals could be replaced to Nd<sup>3+</sup>, such as Nd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub>.

© 2004 Optical Society of America

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