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
Systems, computer programs, and methods for controlling costs of a healthcare practice
Image sensor with improved color crosstalk
Satellite communication network
Method of manufacturing III-nitride crystal
Voltage detecting device for LED driver
Feature management of a communication device
Scanning transmission electron microscope and axial adjustment method thereof
  Randomly Featured Patents
Biometric sensor with delay layer
Apparatus for sealing food packages
Thick-film devices having dielectric layers with embedded microspheres
Molten metal filter
Office furniture system
Dry film multilayer photoresist element
High damping flexible propeller/impleller
Acquisition and presentation of dynamic media asset information for events
Fault characterization using information indicative of echo
Installation for handling stock-piled fragmentary materials