Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-11-13
2007-11-13
Lee, Patrick J. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S216000, C359S517000
Reexamination Certificate
active
11149094
ABSTRACT:
A Fabry-Perot resonator apparatus and method including an in-resonator polarizing element improves detection/measurement sensitivity of an optical system, provides both fields at a single end of the resonator, and overcomes other structural and performance limitations of particular optical systems. A polarizing element, which may be a quarter-wave plate, a 45-degree Faraday rotator or other polarizing element capable of converting between linear and circular polarizations and back, is placed in the resonance path of the Fabry-Perot resonator. The polarizing element effectively doubles the cavity length and orthogonally isolates forward from reverse reflection rays within the resonator, eliminating interference between rays and providing isolated bright and dark fields at each end of the resonator. The polarizing element is introduced in a lens-incorporating Fabry-Perot resonator to eliminate cross-talk between image points and is used in a non-normal incidence Fabry-Perot resonator to emit bright and dark resonance information at either end of the resonator.
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Brunfeld Andrei
Clark Bryan
Toker Gregory
Harris Andrew M.
Lee Patrick J.
Mitch Harris Atty at Law, LLC
Xyratex Technology Limited
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