| 摘要 |
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 alpha (mm-1) of the first optical member and a grating height h (mum) of the diffraction grating satisfy expressions (1) and (2): alpha>=0.04(1) h@263.18×alpha-0.9454(2).
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