Diffractive optical device including grating elements with different grating periods and duty ratios
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United States of America Patent
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Apr 21, 1998
Issued Date -
N/A
app pub date -
Apr 4, 1996
filing date -
Oct 18, 1993
priority date (Note) -
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Abstract
A diffractive optical device includes a substrate for allowing transmission therethrough of light to be diffracted; and a grating section located on the substrate and including a plurality of grating elements each having multiple discrete phase levels. The plurality of grating elements are arranged at different grating periods in different areas of a surface of the substrate and have the phase levels in different numbers in accordance with the grating period.
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