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US 7,405,883 B2Granted
Optical component and method of manufacture of optical component
AssigneeKabushiki Kaisha Ohara
InventorTomohiro Hashimoto
Life of this patent
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Abstract
An optical component or optical low-pass filter has two or more regions demarcated by differences in refractive indexes, in which a region having a refractive index different from the refractive index of the continuous region with the largest volume among the two or more regions is formed in the interior of a transparent material. This optical component or optical low-pass filter has regions with different refractive indexes formed in the interior by pulsed laser irradiation or focused irradiation of the transparent material.
Claims51
An optical component, comprising:
- a plurality of regions demarcated by differences in refractive indexes, the plurality of regions including at least a first region and a second region, the second region corresponding to a continuous region with a largest volume among the plurality of regions, wherein the first region having a refractive index different from a refractive index of the continuous region is formed in an interior of transparent material,
- wherein the first region has a shape which changes periodically within the continuous region.
An optical component, comprising:
- a plurality of regions demarcated by differences in refractive indexes, the plurality of regions including at least a first region and a second region, the second region corresponding to a continuous region with a largest volume among the plurality of regions, wherein the first region having a refractive index different from a refractive index of the continuous region is formed in an interior of transparent material,
- wherein the plurality of regions other than the second region are formed discontinuously, and the plurality of regions formed are arranged periodically in two dimensions or in three dimensions,
- wherein the plurality of regions are formed discontinuously, the plurality of formed regions are arranged periodically in two dimensions or in three dimensions, and the periodic arrangement is a periodic arrangement such that, in the high spatial frequency region equal to or greater than the cutoff frequency, the MTF value≦0.5.
Dependencies are inferred from the claim text.