| 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 coefficientα(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)
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