Coherent light generators – Having an applied magnetic field
Patent
1996-05-22
1998-04-07
Scott, Jr., Leon
Coherent light generators
Having an applied magnetic field
372703, 372106, 372 34, 372 20, 372107, 372 92, H01S 300
Patent
active
057373493
ABSTRACT:
An optical isolator comprises an input polarizer configured to pass light at a predetermined optical polarization axis to a Faraday rotator and thereafter through an output polarizer. A magnet is disposed remotely and laterally away from the Faraday rotator, such that the external field of the magnet maintains the magnetization of the Faraday rotator substantially saturated. In accordance with another aspect of the invention the output polarizer is rotatably adjustable to substantially fine tune the isolator to a given laser wavelength. To this end light is transmitted through an input polarizer, and through a Faraday rotator magnetized in a first magnetization direction so as to rotate the polarization axis of the light passing through the Faraday rotator. The output polarizer is rotatably adjusted until such time that substantially no light travels through the output polarizer. The Faraday rotator is then mangentized in a second magnetization direction such that it reverses the rotation of the polarization axis of the light traveling through it. The postion of the output polarizer is then fixed.
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Jr. Leon Scott
Lucent Technologies - Inc.
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