Laser illumination with speckle reduction
US6191887A · kind A · utility
186Cited by
22References
27Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 7, 2000 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Jan 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/48
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.