Optical: systems and elements – Signal reflector – 3-corner retroreflective
Reexamination Certificate
2007-01-23
2007-01-23
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Signal reflector
3-corner retroreflective
C359S490020
Reexamination Certificate
active
11492285
ABSTRACT:
A phase-compensating cube comer retroreflector includes three rear reflecting surfaces. All three rear reflecting surfaces can be coated with a phase-compensating film stack that induces 2nπ phase difference when handling polarized light. So coated, the phase-compensating cube comer preserves the polarization orientation and ellipticity of the incident light. Such a phase-compensating cube comer 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
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