Polarization plane switch and optical switching device using the

Details Polarization plane switch and optical switching device using the Polarization plane switch and optical switching device using the

1995-04-21

1996-05-28

Hellner, Mark

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359281, 359283, 359284, G02F 103

Patent

active

055217419

ABSTRACT:
A polarization plane switch comprising a Faraday rotator made of an iron-containing garnet single-crystal film and magnetic field applying devices capable of reversing a magnetic field to be applied to the Faraday rotator. The polarization plane switch has a structure in which magnetization of part of the Faraday rotator is unsaturated and that of the remaining portion of it is saturated when a magnetic field is applied to the Faraday rotator by the magnetic field applying device, and a light beam passes through the magnetically saturated portion almost vertically to the film surface. As the above Faraday rotator, it is the most preferable to use a Faraday rotator made of Bi-substituted iron garnet single crystal formed by liquid-phase epitaxy and having a compensation temperature, and thermally treated under the top condition at a temperature between 1,120.degree. and 1,180.degree. C. for 7 hours or less.

REFERENCES:
patent: 4609257 (1986-09-01), Shirasaki
patent: 4810065 (1989-03-01), Valette et al.
patent: 4812767 (1989-03-01), Taketomi
patent: 5050968 (1991-09-01), Ohara
M. Pardavi-Horvath et al. "Asymmetric Switching in high Cercivity Garnet Films", Journal of Magnetism and Magnetic Materials, 104-107. (1992), pp. 433-435.

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