Optical isolator employing multipass faraday rotation

Details Optical isolator employing multipass faraday rotation Optical isolator employing multipass faraday rotation

1986-07-14

1990-03-20

Arnold, Bruce Y.

350405, G02B 530, G02B 2728

Patent

active

049096125

ABSTRACT:
An optical Faraday isolator includes a slab of Faraday rotator medium coated to define input and output faces and internal reflective surfaces for causing the beam to travel between the input and output faces along a zig-zag path. Permanent magnets polarized in a direction normal to the plane defined by the zig-zag beam path are disposed on opposite sides of the beam path. The magnets are paired on each side with serially alternating polarity and the like poles are in transverse registration on opposite sides of the beam path to produce an intense, unidirectional magnetic field parallel to the beam path within the rotator slab. A quarterwave plate introduces a compensating amount of elliptical polarization to cancel unwanted elliptical polarization effects of the slab and its coatings. A beam shaving aperture at the exit of the slab shaves off divergent backward travelling rays.

REFERENCES:
patent: 4712880 (1987-12-01), Shirasaki
De Shazer, L. G., et al, "Optical Isolator for Near Infrared", Rev. of Scientific Instruments, vol. 38, No. 1, Feb., 1967, pp. 248-25.
Shiraishi, K, et al, "Compact Faraday Rotation for an Optical Isolator Using Magnets Arranged with Alternating Polarities", Optics Letter, vol. 11, No. 2, Feb. 1986, pp. 82-84.
Schmitt, R. L. et al, "Diode-Laser Pumped Nd:YAG Laser Injection Seeding System", Applied Optics, vol. 25, No. 5, Mar. 1986, pp. 629-633.

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