Coherent light generators – Particular component circuitry – Optical pumping
Patent
1983-03-07
1985-06-04
Arnold, Bruce Y.
Coherent light generators
Particular component circuitry
Optical pumping
372103, 376104, G02B 518, H01S 313, G21B 100
Patent
active
045210756
ABSTRACT:
A system for achieving very uniform illumination of a target. A beam of broadband spatially-coherent light is converted to light with a controlled spatial incoherence and focused on the target. An echelon-like grating breaks the beam up into a large number of differently delayed beamlets with delay increments larger than the coherence time of the beam, and a focusing lens overlaps the beamlets to produce at the target a complicated interference pattern modulated by a smooth envelope that characterizes the diffraction of an individual beamlet. On time scales long compared to the coherence time, the interference pattern averages out, leaving only the smooth diffraction envelope.
REFERENCES:
patent: 3485552 (1969-12-01), Adler
patent: 3670260 (1972-06-01), Koester et al.
patent: 4195913 (1980-04-01), Dourte et al.
K. Mima and Y. Kato, "111-4 Spatial Coherence Reduction of Fusion Lasers for Absorption Profile Smoothing and Instability Suppression in Plasmas", ILE Progress Report on Inertial Fusion Program, No. 1, pp. 15-18, (issued May 1982).
Lehmberg Robert H.
Obenschain Stephen P.
Arnold Bruce Y.
Beers Robert F.
Ellis William T.
Klein Alan P.
Shapiro Bruce S.
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