Fdk Corporation

Shinzo Fujii

Hirotaka Kawai

Hiromitsu Umezawa

A material made of magnetic garnet single crystals has excellent characteristics particularly in a wavelength band of from 950 to 1070 nm, which is usable for a wavelength 980 nm for pumping light of erbium doped fiber amplifier, and for a wavelength of 1017 nm for pumping light of an praseodymium doped fiber amplifier. One example of the material is made of magnetic garnet single crystals expressed by a composition formula of Nd.sub.3-x Bi.sub.x Fe.sub.5 O.sub.12 (0.5.ltoreq.x.ltoreq.1.9), the single crystals being formed by liquid-phase epitaxial growth on a non-magnetic garnet substrate having a lattice constant &lt;a&gt; specified in the range of 12.61 .ANG..ltoreq.a.ltoreq.12.63 .ANG.. The material is suitably used for a magneto-optical element having a wavelength band from 950 to 1070 nm. The non-magnetic garnet substrate can be made of a material having a composition formula expressed by Gd.sub.3-y Nd.sub.y Sc.sub.2 Ga.sub.3 O.sub.12 (1.0.ltoreq.y.ltoreq.1.4).

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Toyohashi, Japan

Shinzo Fujii