The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 1998
Filed:
Sep. 11, 1992
David G Scerbak, Traverse City, MI (US);
Other;
Abstract
A compact Faraday rotator and isolator featuring a uniform magnetic field for isolating a light source from light which is directed back towards the light source. The isolator comprises a Faraday rotator between two polarizers in a uniform magnetic field. The uniform magnetic field is generated by two pairs of polyhedral shape magnets on opposite sides of the isolator's optical axis. The optical axis passes through a block of Faraday rotator material. One pair of magnets is disposed above the optical axis and the other pair of magnets is disposed below the optical axis. Opposite poles of the magnets are adjacent to each other on the same side of the optical axis and like poles of the magnets face each other across the optical axis, the direction of magnetization of each magnet being generally normal to the optical axis. The magnets on each side of the optical axis abut each other in the lengthwise vertical mid-plane of the Faraday optic and diverge from the mid-plane toward the Faraday optic, preferably to at least the ends of the Faraday optic. The gap forming geometry of the magnets and pole pieces generate a uniform and intense magnetic field having predominant longitudinal components which are parallel to the path of a beam passing through the Faraday rotator.