Diffraction grating, laser apparatus, and manufacturing method for diffraction grating

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United States of America Patent

PATENT NO 9583910
APP PUB NO 20150255946A1
SERIAL NO

14641890

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Abstract

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This diffraction grating is a reflection-type diffraction grating that has a grating, the cross section of which is an asymmetrical triangular shape, and wherein given that θ denotes an angle between a short side and a base of the triangular shape, and φ denotes an angle between the short side and a long side of the triangular shape, and α denotes an incident angle of light to a normal of the base, the angles θ and φ satisfy a condition represented by the following formulas:

description='In-line Formulae' end='lead'φ+θ≦90+α,description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.1127291(φ−φd)2−19.67453(φ−φd)+938.74+θd≦θ≦0.36631(φ−φd)+48.84+θd description='In-line Formulae' end='tail'

    where φd=0.845σ and θd=1.065σ, in σ=α−79.25.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kitamura, Tsuyoshi Utsunomiya, JP 42 255

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