Diffractive optical element, and optical system and optical apparatus provided with the same
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United States of America Patent
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Aug 9, 2005
Grant Date -
Dec 18, 2003
app pub date -
Jun 12, 2003
filing date -
Jun 17, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diffractive optical element of the blazed-binary grating type is disclosed, with which a high diffraction efficiency can be achieved over substantially the entire used wavelength region. The diffractive optical element has a periodic structure taking a grating unit including a plurality of grating portions with different grating width and grating interval as one period. The diffraction element further includes a plurality of first grating portions made of a first material and a plurality of second grating portions made of a second material having a different refractive index than the first material that are arranged between the first grating portion.
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