Semiconductor sensor for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets

Duncan, Paul G

Title: Semiconductor sensor for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874673

Duncan, Paul G ^[1]

8544 Electric Ave., Vienna, VA 22182

Described are the design of a rare earth iron garnet sensor element, optical methods of interrogating the sensor element, methods of coupling the optical sensor element to a waveguide, and an optical and electrical processing system for monitoring the polarization rotation of a linearly polarized wavefront undergoing external modulation due to magnetic field or electrical current fluctuation. The sensor element uses the Faraday effect, an intrinsic property of certain rare-earth iron garnet materials, to rotate the polarization state of light in the presence of a magnetic field. The sensor element may be coated with a thin-film mirror to effectively double the optical path length, providing twice the sensitivity for a given field strength or temperature change. A semiconductor sensor system using a rare earth iron garnet sensor element is described.

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Research Organization:: Airak, Inc. (US)

DOE Contract Number:: FG02-99ER86100

Assignee:: Duncan; Paul G. (8544 Electric Ave., Vienna, VA 22182)

Patent Number(s):: US 6437885

OSTI ID:: 874673

Country of Publication:: United States

Language:: English

References (68)

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linearly
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magnetic field
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Title: Semiconductor sensor for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets

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References (68)

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