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US 8,508,847 B2Granted
Diffractive optical element and optical device
AssigneePanasonic Corporation
InventorsKazuhiro Yamada, Kazuhiro Minami, Yasuhiro Tanaka
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Abstract
In a diffractive optical element, first and second optical members are stacked, and a diffraction grating is formed at an interface between the first and second optical members. In the diffractive optical element, an absorption coefficient α (mm−1) of the first optical member and a grating height h (μm) of the diffraction grating satisfy expressions (1) and (2): α≧0.04 (1) h≦263.18×α−0.9454 (2).
Claims4
A diffractive optical element, comprising:
- first and second optical members which are stacked, and which have a diffraction grating formed at an interface between the first and second optical members,
- wherein an absorption coefficient a (mm−1) of the first optical member and a grating height h (μm) of the diffraction grating in an entire wavelength range of 400-700 nm satisfy expressions (1) and (2):
- α≧0.04 (1)
- h≦263.18×α−0.9454 (2)
1 more element
Dependencies are inferred from the claim text.