Methods for optical beam shaping and diffusing
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United States of America Patent
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Apr 3, 2007
Grant Date -
Oct 31, 2002
app pub date -
Apr 25, 2002
filing date -
Apr 27, 2001
priority date (Note) -
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Abstract
This invention relates to an apparatus for optical beam shaping and diffusing, a method for making the apparatus, and a method for using the apparatus. The apparatus comprises a crystalline material object shaped to fit within an optical train and with a pattern of surface texture along an optical path. Surface removal processes are applied to a portion of a surface of an object made of a crystalline material to form a surface texture pattern at that portion of the surface of the object. The surface texture pattern depends upon: (1) the identity of the crystalline material and (2) the orientation of crystal lattice axes within the object with respect to the portion of the surface of the object where the pattern of surface texture is to be formed. Processes for making the apparatus include, but are not limited to, mechanical grinding, ablating, chemical etching, plasma etching, ion milling, and combinations thereof. The arrangement of the pattern of surface texture can be refined by coupling lithographic patterning methods with any of the surface removal processes. The apparatus can be used to change one or more of: (1) a shape, (2) an orientation, (3) an aspect ratio, (4) an angular pupil distribution, and (5) an intensity profile of a cross section of an optical beam.
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