Laser illumination with speckle reduction
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United States of America Patent
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Feb 20, 2001
Grant Date -
N/A
app pub date -
Jan 7, 2000
filing date -
Jan 20, 1999
priority date (Note) -
Expired
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Abstract
A speckle reduction system divides pulses of coherent radiation into successions of temporally separated and spatially aberrated pulselets. One or more beamsplitters divide the pulses into the successions of pulselets that are circulated through delay lines. Spatial aberrators located along the delay lines modify wavefront shapes of the pulselets. Together, the temporal separation and spatial aberration of the pulselets produce a succession of different speckle patterns that can be averaged together within the integration interval of a detector to reduce speckle contrast.
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