Patent
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.
Arnold Bruce Y.
Massachusetts Institute of Technology
Smith James M.
Smith, Jr. Arthur A.
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