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
Dual gate electronic memory cell and device with dual gate electronic memory cells
Focusing apparatus that effectively sets a focus area of an image when a focusing mode is changed
Apparatus and method for image reconstruction and CT system
Method and system for an integrated host PCI I/O bridge and dual port gigabit ethernet controller
Compound semiconductor device and manufacturing method therefor
Printed wiring board with reinforced insulation layer and manufacturing method thereof
(4927
  Randomly Featured Patents
Composite diffuser structure and backlight module
Telephone credit card system
Work vehicle with staggered control level
Plastic optical fiber
Skin packaging substrate
Pressure pipe comprising a multimodal polyethylene composition with an inorganic filler
High bandwidth reconfigurable on-chip network for reconfigurable systems
Antibodies that bind specifically to human RON protein
Image editing with block selection
Hand-held portable printer