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P‐171: Laser Speckle Reduction Using MEMS Scanning Mirror
Author(s) -
Tong Zhaomin,
Akram Muhammad Nadeem,
Ouyang Guangmin,
Chen Xuyuan,
Kartashov Vladimir
Publication year - 2010
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3500389
Subject(s) - speckle pattern , optics , microelectromechanical systems , scattering , materials science , laser , reduction (mathematics) , light scattering , physics , optoelectronics , mathematics , geometry
Laser beams reflected from a MEMS scanning mirror introduce movable scattering spots onto a Random Phase Plate (RPP), and the scattering lights after the RPP are homogenized by a hexagonal light pipe. A rough transmission object is placed closely after the light pipe, and the real‐time changeable speckle patterns are added together within the exposure time of a CCD camera. Speckle is suppressed and 0.0673 minimum speckle Contrast Ratio (CR) is obtained.