Optical: systems and elements – Optical modulator – Having particular chemical composition or structure
Patent
1997-06-02
1999-04-27
Epps, Georgia
Optical: systems and elements
Optical modulator
Having particular chemical composition or structure
359321, G02F 100
Patent
active
058985166
ABSTRACT:
A Faraday rotator is formed of a bismuth-substituted iron garnet single crystal film grown by a liquid phase epitaxial method. The single crystal film is represented by a formula: Tb.sub.3-x Bi.sub.x Fe.sub.5-y-z Ga.sub.y Al.sub.z O.sub.12 wherein x has the range 1.1.ltoreq.x.ltoreq.1.5, y+z has the range 0.65.ltoreq.y+z.ltoreq.1.2, and z has the range z.ltoreq.y. The bismuth-substituted rare earth single crystal film is subjected to a magnetization process where the single crystal film is magnetized by an external magnetic field so that the film has a square magnetic hysteresis loop. The external magnetic field has a magnetic field strength of 1,000 Oe or higher and is applied in a direction normal to a surface of the bismuth-substituted rare earth iron garnet single crystal film.
REFERENCES:
patent: 4981341 (1991-01-01), Brandle, Jr. et al.
"Bi-Substituted Magnetic Garnet Film and Its Application to an Optical Isolator" by Uchishiba et al, Fujitsu-Scientific and Technical Journal, vol. 26, No. 2, Jan. 1990, p. 123.
"Magnetic and Magneto-Optic Properties of Bismuth- and Aluminum-Substituted Iron Garnet Films" Journal of Applied Physics, Feb. 1984 vol. 55, No. 4, pp. 1052-1061.
Patent Abstracts of Japan, Pub. No. 09033871, Feb. 1997.
Patent Abstracts of Japan, Pub. No. 06222311, Aug. 1994.
Hiramatsu Kiyonari
Shirai Kazushi
Takeda Norio
Bey Dawn-Marie
Epps Georgia
Mitsubishi Gas Chemical Company Inc.
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