Holographic diffraction grating patterns and methods for creating the same
AssigneeApplied Holographics Corporation
InventorCraig Newswanger
Life of this patent
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Abstract
Methods for creating a plurality of holographic diffraction grating patterns in a raster scan fashion. In accordance with the method, the desired pattern is made up of a large plurality of individual spots, each spot comprising a holographic diffraction grating of a predetermined grating spacing and angular orientation for that spot. Variation of the angular orientation and/or grating spacing between spots and/or groups of spots provide the desired holographic effect. The spot locations may vary as desired, including locations drawing out a desired pattern, and two-dimensional orthogonal matrices in which a pattern is drawn by variations between spots or group of spots as in a raster scan type image. Various embodiments and methods for creating the same are disclosed.
Claims19
A method of forming holographic diffraction grating patterns comprising the steps of:
- (a) providing a member having a photosensitive region thereon;
- (b) generating a pair of beams from a diffraction grating;
- (c) directing said beams with a lens to a spot on said photosensitive region such that a holographic diffraction grating is created within said spot of said photosensitive region;
- and,
- (d) repeating step (c) a plurality of times for a plurality of spots having different locations on the photosensitive region to define a pattern thereon.
A method of forming holographic diffraction grating patterns, comprising the steps of:
- a) directing a beam of light through a diffraction grating to create a pair of pattern beams;
- b) focusing said pattern beams onto a first spot of a photosensitive member such that a holographic diffraction grating is created onto said first spot of said photosensitive member;
- c) moving said photosensitive member such that a second spot can be exposed to said pattern beams;
- d) rotating said diffraction grating;
- and
- e) directing a beam of light through said diffraction grating, to create a pair of pattern beams which are focused onto said photosensitive member such that a second holographic diffraction grating is created onto said second spot.
Dependencies are inferred from the claim text.