Optics: measuring and testing – By light interference – Having polarization
Reexamination Certificate
2008-05-27
2008-05-27
Connolly, Patrick (Department: 2877)
Optics: measuring and testing
By light interference
Having polarization
Reexamination Certificate
active
07379187
ABSTRACT:
A phase difference detector generates a plurality of signals from an input beam including orthogonal, linearly polarized object and reference beam components. The detector may be configured such that as the reference and object beam components traverse the detector, phase shifts due to surface interactions are made as similar as possible between the s-components of the reference object beams, and between the p-components of the reference and object beams. Various outputs may be formed by interfering p-components exclusively, or s-components exclusively, negating errors that may otherwise arise due to differential phase shifts between p- and s-components. Phase-shifting elements in the detector may receive beams from beam splitting surfaces where the transmissive differential phase shift between p- and s-components is adjusted to insignificance.
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Connolly Patrick
Mitutoyo Corporation
Oliff & Berridg,e PLC
Richey Scott M
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