Resources Contact Us Home
Narrow band polarization encoder

Image Number 15 for United States Patent #6611342.

An interferometer optical element is provided with a birefringent material in the light path. Specifically, a Fabry-Perot optical resonance cavity is operated in a fully reflective mode and is provided with a birefringent material in a cavity between two reflectors. A first mirror, for example of about 90% reflectance and a second mirror, for example of 99% reflectance, define the cavity. The polarization effect is applied exclusively to the resonant wavelength defined by the spacing of the two reflectors. The input beam is fully reflected back in the direction of incidence. However the resonant wavelength component therein is polarized and can be discriminated, e.g., selectively diverted by a polarization beam splitter. A number of application are disclosed, including using a birefringent liquid crystal material and tuning the apparent optical path length by electrically adjusting the birefringence. The device also is cascadable for selectively operating on certain wavelengths and diversely polarizing some wavelengths and not others. In a preferred embodiment, the input beam is applied at 45 degrees to the fast axis of oriented birefringent nematic liquid crystal, which can optionally involve separately altering and recombining diverse polarization components of the input beam.

  Recently Added Patents
Methods and systems for creating a tail risk hedge index and trading derivative products based thereon
System and method for managing investment funds
Systems and methods for building axes, co-axes and paleo-geographic coordinates related to a stratified geological volume
Hybrid fiber constructions to mitigate creep in composites
Architecture, system and method for testing resistive type memory
Method and system for monitoring service quality in a mobile node
ZnO green luminescent material and its preparation
  Randomly Featured Patents
Electronic ballast with reversely wound filament winding
Liquid crystal display and data latch circuit
Diving vest
Miter attachment
Controllably feeding organic material in making OLEDs
Dispersant compositions for subterranean well drilling and completion
Unsubstituted and polymeric fluoran colorants for coloring consumer products
Multilevel nonvolatile memory device using variable resistance
Stripping composition for thermoset resins and method of repairing electrical apparatus
Stitch flap cutting block