Diffractive optical element and optical device
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United States of America Patent
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Oct 22, 2013
Grant Date -
Oct 27, 2011
app pub date -
Apr 22, 2011
filing date -
Apr 23, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A diffractive optical element includes first and second optical members which are stacked. The first optical member includes a diffraction grating in which a plurality of raised portions each having a vertical surface and a surface inclined to the vertical surface are arranged. The second optical member includes a diffraction grating in which a plurality of recessed portions are arranged, to which the raised portions are fitted. The diffraction grating of the first optical member and the diffraction grating of the second optical member are in close contact with each other. A ridge portion of the raised portion defines a curved surface. A curvature radius R (μm) of the curved surface, a pitch P (mm) of the raised portions, and a refractive index difference Δnd between the first and second optical members satisfy a predetermined relationship.
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