Methods and apparatus for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets
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United States of America Patent
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Mar 18, 2003
Grant Date -
N/A
app pub date -
Oct 21, 1999
filing date -
Oct 21, 1998
priority date (Note) -
Expired
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Abstract
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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