Optical: systems and elements – Signal reflector – 3-corner retroreflective
Reexamination Certificate
2006-10-17
2006-10-17
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Signal reflector
3-corner retroreflective
C359S485050
Reexamination Certificate
active
07121671
ABSTRACT:
A phase-compensating cube corner retroreflector includes three rear reflecting surfaces. The first and the third rear reflecting surfaces can be coated with a phase-compensating film stack that induces 2nπ phase difference upon reflection, where n is an integer including 0. Alternatively, all three rear reflecting surfaces can be coated with a phase-compensating film stack that induces nπ phase difference when handling linearly polarized light, or 2nπ phase difference when handling linearly or circularly polarized light. So coated, the phase-compensating cube corner preserves the polarization orientation and ellipticity of the incident light. Such a phase-compensating cube corner can be used to improve the accuracy of distance-measuring interferometers. The cube corner directs light to and from other optical elements, including a polarizing beam-splitters, mirrors, and quarter-wave plates.
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Bockman John J.
Lee Lawrence Hakchu
Agilent Technologie,s Inc.
Cherry Euncha P.
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