Ferro-electric azimuth rotator
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United States of America Patent
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Mar 2, 2004
Issued Date -
N/A
app pub date -
Aug 14, 2002
filing date -
Mar 6, 2000
priority date (Note) -
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Abstract
An electrically controllable azimuth optical rotator (10) includes a first quarterwave plate (16) for receiving a first beam of electromagnetic energy (22) having a first arbitrary polarization state, and outputting a second beam (122) in response to the first quarterwave plate (16). An electric voltage controlled ferro-electric variable phase retarder (20) aligned at approximately 45 degrees to the first quarterwave plate (16) receives the second beam 122 and provides a third beam 38 in response to the retarder (20). The electric voltage controlled ferro-electric variable phase retarder (20) is characterized by a phase shift of .phi.=2.alpha., where .alpha. is a desired angle of rotation of the first arbitrary polarization state. To provide a voltage-controlled rotation, a second quarterwave plate (18) is aligned either parallel or perpendicular to the first quarterwave plate (16) for receiving the third beam (38) and outputting a fourth beam (46) in response to the retarder (20). As a result, the fourth beam (46) has a polarization state similar to the first arbitrary polarization state but rotated by .alpha..
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