Broadband diffractive diffuser and associated methods

Details Broadband diffractive diffuser and associated methods Broadband diffractive diffuser and associated methods

G - Physics

02

B

G02B 5/18 (2006.01) G02B 5/02 (2006.01) G02B 5/32 (2006.01) G03F 7/20 (2006.01) G03H 1/00 (2006.01) G03H 1/08 (2006.01)

Patent

CA 2330862

A broadband diffractive diffuser contains at least three levels, with approximately a phase shift of a 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 .pi. at a design wavelength, approximately 25 % of the area of the plurality of regions presenting a phase shift of 2.pi. 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.

Diffuseur à diffraction large bande, comprenant au moins trois niveaux et présentant un déphasage égal approximativement à pi 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 pi , approximativement 25 % de la surface présente un déphasage égal à 2 pi 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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