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
Process for shaping polymeric articles
VGPU: a real time GPU emulator
Radiation protective garment with forced ventilation and method
Mobile target system
Tracking data eye operating margin for steady state adaptation
Flexible pouch
Real-time demand prediction in a fast service restaurant environment
  Randomly Featured Patents
Roll-over disk plow
Multi-menisci processing apparatus
Memory device with skew-removable I/O structure
Method of making bellows pipe
Process for the production of crosslinked polymer employing low VOC-producing silane crosslinker and resulting crosslinked polymer
Dynamic message context driven application assembly for customer service agent productivity applications
Memory based illumination device
Device for determining the topographic map of the loading surface of a shaft furnace
Method of synchronizing multi-carrier systems and multi-carrier system
Knocking state determination device