Compact uniform field Faraday isolator

Details Compact uniform field Faraday isolator Compact uniform field Faraday isolator

1992-09-11

1998-02-03

Shafer, Ricky D.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359283, 359484, 372703, G02F 109, G02B 530

Patent

active

057150800

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.

REFERENCES:
patent: 3602575 (1971-08-01), Young
patent: 3707321 (1972-12-01), Jaecklin et al.
patent: 3860325 (1975-01-01), Matsushita et al.
patent: 4033670 (1977-07-01), Tanton et al.
patent: 4609257 (1986-09-01), Shirasaki
patent: 4804256 (1989-02-01), Wilson
patent: 4856878 (1989-08-01), Wilson et al.
patent: 4909612 (1990-03-01), Scerbak
patent: 5029953 (1991-07-01), Dexter et al.
patent: 5087984 (1992-02-01), Heiney et al.
patent: 5115340 (1992-05-01), Tidwell
Shibukawa et al, "Compact Optical Isolator for Near-Infrared Radiation," Electronics Letters, 24 Nov. 1977, No. 24, vol. 13, pp. 721 to 722.
Gauthier, D.J. et al, "Simple, compact, high-performance permanent magnet Faraday isolator", Optics Letters, vol. 11, No. 10, Oct., 1986 pp. 623-625 .

Affiliated with

Also associated with

Rating

Compact uniform field Faraday isolator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Compact uniform field Faraday isolator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact uniform field Faraday isolator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-667671