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1. WO1999057583 - BROADBAND DIFFRACTIVE DIFFUSER AND ASSOCIATED METHODS

Publication Number WO/1999/057583
Publication Date 11.11.1999
International Application No. PCT/US1999/009704
International Filing Date 04.05.1999
Chapter 2 Demand Filed 03.12.1999
IPC
G02B 5/02 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
02Diffusing elements; Afocal elements
G02B 5/18 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
18Diffracting gratings
G03F 7/20 2006.01
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
7Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
20Exposure; Apparatus therefor
CPC
B23K 26/06
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
B23K 26/066
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
064by means of optical elements, e.g. lenses, mirrors or prisms
066by using masks
G02B 27/09
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
G02B 27/0927
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
0927Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
G02B 27/0944
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
0938Using specific optical elements
0944Diffractive optical elements, e.g. gratings, holograms
G02B 5/0221
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
02Diffusing elements; Afocal elements
0205characterised by the diffusing properties
021the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
0221the surface having an irregular structure
Applicants
  • DIGITAL OPTICS CORPORATION [US]/[US]
  • KATHMAN, Alan, D. [US]/[US] (UsOnly)
  • JOHNSON, Eric, G. [US]/[US] (UsOnly)
  • FEDOR, Adam, S. [US]/[US] (UsOnly)
  • MORRIS, James, E., Jr. [US]/[US] (UsOnly)
Inventors
  • KATHMAN, Alan, D.
  • JOHNSON, Eric, G.
  • FEDOR, Adam, S.
  • MORRIS, James, E., Jr.
Agents
  • MORSE, Susan, S.
Priority Data
09/071,76205.05.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) BROADBAND DIFFRACTIVE DIFFUSER AND ASSOCIATED METHODS
(FR) DIFFUSEUR A DIFFRACTION LARGE BANDE ET PROCEDES ASSOCIES
Abstract
(EN)
A broadband diffractive diffuser contains at least three levels, with approximately a phase shift of $g(p) between at least two of the at least three levels. Such a diffuser provides light with more than two phasor vectors at the zero order. The presence of the more than two phasor vectors reduces the zero order diffraction efficiency at non-design wavelength, increasing the usefulness of the diffuser at wavelengths other than the design wavelength. Preferably, the diffractive diffuser includes a plurality of regions, approximately 50 % of an area of the plurality of regions presenting a phase shift of $g(p) at a design wavelength, approximately 25 % of the area of the plurality of regions presenting a phase shift of 2$g(p) at the design wavelength, and approximately 25 % of the area of the plurality of regions presenting a phase shift of 0 at the design wavelength. Such a diffractive diffuser may be formed by logical operations between two diffractive diffuser patterns, by adding two diffractive diffuser patterns, or by pixel-by-pixel scanning.
(FR)
Diffuseur à diffraction large bande, comprenant au moins trois niveaux et présentant un déphasage égal approximativement à $g(p) entre au moins deux niveaux. Ce diffuseur émet la lumière avec plus de deux vecteurs de phaseur à l'ordre zéro. La présence desdits vecteurs réduit le rendement de la diffraction d'ordre zéro à la longueur d'onde non prévue par la conception, ce qui accroît l'utilité du diffuseur à des longueurs d'onde autres que celle prévue par la conception. De préférence, le diffuseur à diffraction comprend une pluralité de régions. A la longueur d'onde prévue par la conception, approximativement 50 % de la surface de la pluralité des régions présente un déphasage égal à $g(p), approximativement 25 % de la surface présente un déphasage égal à 2$g(p) et approximativement 25 % un déphasage nul. On peut former ce diffuseur à diffraction soit par des opérations logiques entre deux motifs de diffuseur, en ajoutant deux motifs, soit par balayage pixel par pixel.
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