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Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror
M Nadeem Akram1, Zhaomin Tong, Guangmin Ouyang
1University College Vestfold, Institute of Microsystems Technology, N3103 Tønsberg, Norway. mna@hive.no
Applied Optics
|June 12, 2010
Summary
Speckle reduction in laser illumination was achieved using spatial and angular diversity. This technique significantly reduces speckle contrast, enhancing laser projection quality.
Area of Science:
- Optics and Photonics
- Laser Physics
- Image Processing
Background:
- Laser speckle is a granular noise pattern that degrades image quality.
- Speckle reduction is crucial for applications like laser projection and imaging.
Purpose of the Study:
- To develop and demonstrate a speckle reduction technique for laser illumination.
- To evaluate the effectiveness of spatial and angular diversity in reducing speckle contrast.
Main Methods:
- Utilized spatial and angular diversity for speckle reduction.
- Employed a fast two-dimensional scanning micromirror to steer the laser beam.
- Configured both free-space and imaging geometries.
Main Results:
- Achieved significant speckle contrast reduction.
- Reduced speckle contrast factor down to 5%.
- Demonstrated the technique in a two-dimensional laser picture projection.
Conclusions:
- Spatial and angular diversity effectively reduces laser speckle.
- The proposed method is suitable for practical applications like laser projection.
