Method and apparatus for shaping electromagnetic beams
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United States of America Patent
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-
Oct 18, 1983
Grant Date -
N/A
app pub date -
Sep 26, 1980
filing date -
Sep 26, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The intensity profile of a beam of electromagnetic waves such as a laser beam is shaped by means of a diffraction grating and/or prism in the beam path. In one embodiment, beams exhibiting Gaussian energy intensity profiles undergo an energy redistribution to approximately uniform profiles. A reflective or transmissive surface relief grating is employed with phase steps generally periodic except at the pattern center where a pattern phase reversal occurs. Prisms are cut and oriented relative to the incoming beam to operate at the Brewster's angle for compressing or expanding the beam with minimum losses.
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