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.
© 2010 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: January 20, 2010
Revised Manuscript: May 10, 2010
Manuscript Accepted: May 17, 2010
Published: June 4, 2010
M. Nadeem Akram, Zhaomin Tong, Guangmin Ouyang, Xuyuan Chen, and Vladimir Kartashov, "Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror," Appl. Opt. 49, 3297-3304 (2010)