Method and apparatus for shaping electromagnetic beams

Details Method and apparatus for shaping electromagnetic beams Method and apparatus for shaping electromagnetic beams

1980-09-26

1983-10-18

Arnold, Bruce Y.

3501622, G02B 518

Patent

active

044102372

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.

REFERENCES:
patent: 3407294 (1968-10-01), Hill
patent: 3843239 (1974-10-01), Tsunoda et al.
patent: 4127828 (1978-11-01), Klauminzer
patent: 4143937 (1979-03-01), Yonezawa et al.

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