Diffractive optical element and optical system having the same
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United States of America Patent
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Jul 11, 2006
Grant Date -
Jan 10, 2002
app pub date -
May 30, 2001
filing date -
May 31, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a diffractive optical element and a polarization separation element using this diffractive optical element, incident light can be effectively separated for the respective polarization directions over the entire used wavelength range. The diffractive optical element is arranged such that the diffractive optical element has a grating structure in which at least two blazed type grating portions are successively arranged along a light traveling direction. Additionally, in at least one grating portion of the two blazed type grating portions, structures smaller than a used wavelength are arranged in a periodic manner.
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