Optical soft aperture and use thereof
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United States of America Patent
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Dec 28, 1999
Issued Date -
N/A
app pub date -
Apr 14, 1997
filing date -
Jun 25, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A soft aperture allows gradual attenuation of a light beam dependent upon its location away from the center of a diffractive optical element. Such an optical element may be provided by decreasing a number of phase levels, increasing a number of phase levels, increasing a density of metal patches or diffractive gratings, or decreasing a blaze height and/or duty cycle, all radially from the center. Alternatively, the soft aperture may be defined by a photolithographic process. Such a soft aperture is particularly useful in aiding circularizing of an elliptical light beam. The soft aperture may be used alone or integrated with other optical elements.
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