Polarization separation element and optical apparatus using the same
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United States of America Patent
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Issued Date -
Jan 15, 2004
app pub date -
Jun 26, 2003
filing date -
Jul 11, 2002
priority date (Note) -
Abandoned
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Abstract
An optical element includes a substrate; a first diffraction grating disposed on the substrate and having a period that is shorter than a light wavelength used; and a second diffraction grating disposed on the first diffraction grating and having a period that is shorter than the light wavelength used. In the optical element, the melting point of a material of the first diffraction grating is higher than the melting point of a material of the second diffraction grating.
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