| 摘要 |
A diffractive optical element includes a blazed diffraction grating having inclined facets and vertical facets arrayed in an alternating sequence, in which only the vertical facets of the blazed diffraction grating are frosted by ashing. Another diffractive optical element includes a blazed diffraction grating having inclined facets and vertical facets arrayed in an alternating sequence, in which only the vertical facets of the blazed diffraction grating have an opaque film formed thereon.
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