Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror.
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.
University College Vestfold, Institute of Microsystems Technology, N3103 Tønsberg, Norway. mna@hive.no
M Nadeem
MN
Akram
Zhaomin
Z
Tong
Guangmin
G
Ouyang
Xuyuan
X
Chen
Vladimir
V
Kartashov