Faraday rotator

Details Faraday rotator Faraday rotator

2011-03-01

2011-03-01

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S281000

Reexamination Certificate

active

07898720

ABSTRACT:
A Faraday rotator having a magnet member constituted of a first magnet standing magnetized in the direction perpendicular to the optical axis and taken toward the optical axis, a second magnet standing magnetized in the direction perpendicular to the optical axis and taken against the optical axis, and a third magnet disposed between these magnets and standing magnetized in the direction parallel to the optical axis and taken toward the first magnet from the second magnet. A through-hole (hollow spaces) inside which a Faraday element is disposed, is provided through the center of these magnets and, where the length of the first magnet and that of the second magnet in the optical-axis direction are both represented by L2and the length of the third magnet in the optical-axis direction is represented by L3, the relationship of the following Expression (1) is established:in-line-formulae description="In-line Formulae" end="lead"?L2/10≦L3≦L2.  Expression (1)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 4856878 (1989-08-01), Wilson et al.
patent: 7206116 (2007-04-01), Fehn
patent: 2005/0225831 (2005-10-01), Fehn et al.
patent: 61-114420 (1986-07-01), None
patent: 2004-302412 (2004-10-01), None
patent: 2007-248779 (2007-09-01), None

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