Optical: systems and elements – Diffraction – From zone plate
Patent
1997-04-14
1999-12-28
Spyrou, Cassandra
Optical: systems and elements
Diffraction
From zone plate
359575, 359900, 359888, G02B 530
Patent
active
060089415
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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Feldman Michael
Kathman Alan D.
Te Kolste Robert
Welch W. Hudson
Digital Optics Corporation
Jr. John Juba
Spyrou Cassandra
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