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Proceedings Paper

Novel speckle suppression in LCoS based laser projection
Author(s): Mingjie Sun; Zukang Lu
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Paper Abstract

When coherent light scattered from a rough surface, speckle is detected by an intensity detector. In laser projection, speckle severely affects the image quality and therefore must be suppressed. It is mostly achieved by vibrating or rotating a diffuser or a diffractive optical element (DOE) in illumination system. These methods can effectively reduce the speckle, but also cause energy loss of the illumination light due to source extension. A novel way of speckle suppression, which is in principle by varying incident light angle continuously within a light pipe, is proposed. Both theoretical and experimental systems are built. Experimental results show that the new method brings the speckle contrast down to 3.45% and preserves more than 90% energy.

Paper Details

Date Published: 25 November 2009
PDF: 9 pages
Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75060J (25 November 2009); doi: 10.1117/12.837598
Show Author Affiliations
Mingjie Sun, Zhejiang Univ. (China)
Zukang Lu, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 7506:
2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Kimio Tatsuno, Editor(s)

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