Back to results
US 7,480,084 B2Granted
Holographic filter with a wide angular field of view and a narrow spectral bandwidth
AssigneeSTX Aprilis, Inc.
InventorsRichard T. Ingwall, David A. Waldman
Life of this patent
Estimating the term…
Abstract
A holographic optical filter that includes an optical recording medium for storing several multiplexed reflection holograms that are formed by successive interference between two or more collimated object beams with a common collimated reference beam. The object beams are incident to the recording material at a series of angles chosen to provide reflection efficiency over the desired filed of view at the specified wavelength.
Claims7
A method for filtering light, comprising:
- directing an incident light beam having multiple wavelengths from over a large angular field of view at a multiplexed reflection hologram, any light of the incident light beam with a specified wavelength, at any angle within the angular field of view, being reflected in a direction parallel to a common original reference beam used to form the multiplexed hologram,
- wherein the multiplexed hologram is formed by successive interference between two or more collimated object beams and the original reference beam.
Dependencies are inferred from the claim text.