Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Range extension techniques for a wireless local area network
Systems and methods for facilitating communication with foundation fieldbus linking devices
Systems and methods for managing and utilizing excess corn residue
Carrier for developing electrostatic charge image, developer for developing electrostatic charge image, image forming apparatus, and image forming method
Low latency interrupt collector
Discharge lamp comprising coated electrode
Image reading apparatus and image forming apparatus
  Randomly Featured Patents
Method and apparatus for handling multi-volume datasets in a tape storage system
Dynamic asynchronous bandwidth allocation with multiple predictors for variable bit rate traffic
Convertible compact cigarette making machine
Method for in-situ aberration measurement of optical imaging system in lithographic tools
Dock leveler in which the ramp is raised and lowered using an inflatable member and method of use
Filter
Form measuring instrument, and calibration method and calibration program therefor
Tattoo machine
Method of measuring blood component, sensor used in the method, and measuring device
Enhancement of multiple color images without color separation error by inverse symmetrical template matching