Grating processing unit
OwnerAtsushi Sugitatsu, Hiroyuki Kawanoinventors
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Abstract
Light emitted from a light source is split into a plurality of grating-like diverged beams of light by a Fourier transform phase hologram (3), and an image of a grating (100) is formed on a fiber (1) by a lens (4). Consequently, a grating cycle A can be obtained with accuracy ranging approximately from 25 to 1 (nm). Also, the grating cycle Λ can be readily changed.
Claims29
A grating processing unit for forming a refractive index diffraction grating on a light wave guide, having a light wave guide portion using a material that causes a change of a refractive index by means of light irradiation, by irradiating irradiation light having a grating-like light intensity pattern, characterized by including:
- a light source;
- and
- an optical system for generating the irradiation light having said grating-like light intensity pattern out of light emitted from said light source through a Fourier transform phase hologram.
Dependencies are inferred from the claim text.