Compositions – Light transmission modifying compositions – Inorganic crystalline solid
Patent
1995-07-05
1996-08-20
Bos, Steven
Compositions
Light transmission modifying compositions
Inorganic crystalline solid
117945, 423263, G02B 520, C30B 2928, C01F 1700
Patent
active
055476139
ABSTRACT:
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 <a> 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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T. Tamaki et al., "Magneto-Optical Properties Of (RBi).sub.3 Fe.sub.5 O.sub.12 at 0.8 .mu.m Wavelength Band", Journal of Japan Society of Applied Magnetism, vol. 12, No. 2, p. 179 (1988), No Month.
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Fujii Shinzo
Kawai Hirotaka
Umezawa Hiromitsu
Bos Steven
FDK Corporation
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