Method and apparatus for laser beam combining and speckle reduction
US10613341B2 · kind B2 · utility
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23Claims
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Key dates
| Filing date | Apr 9, 2018 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | Nov 17, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0178
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A beam combining device combines laser beams and performs speckle reduction of the laser light. Two laser beams are incident on a non-polarizing beam splitter and combined beams are split into two light paths with different optical path lengths. The two light paths may have different geometric path lengths and/or different indices of refraction in the paths to produce the different optical path lengths. One of the light paths is passed through a polarization rotation device and then the two light paths are recombined with a polarizing beam splitter to produce a combined reduced speckle laser beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.