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Appl Opt. 2010 Jun 10;49(17):3297-304. doi: 10.1364/AO.49.003297.

Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror.

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University College Vestfold, Institute of Microsystems Technology, N3103 T√łnsberg, Norway.


We utilize spatial and angular diversity to achieve speckle reduction in laser illumination. Both free-space and imaging geometry configurations are considered. A fast two-dimensional scanning micromirror is employed to steer the laser beam. A simple experimental setup is built to demonstrate the application of our technique in a two-dimensional laser picture projection. Experimental results show that the speckle contrast factor can be reduced down to 5% within the integration time of the detector.

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