Novel speckle suppression in LCoS based laser projection

Mingjie Sun; Zukang Lu

doi:10.1117/12.837598

25 November 2009 Novel speckle suppression in LCoS based laser projection

Mingjie Sun, Zukang Lu

Proceedings Volume 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 75060J (2009) https://doi.org/10.1117/12.837598
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

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.

Citation Download Citation

Mingjie Sun and Zukang Lu "Novel speckle suppression in LCoS based laser projection", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75060J (25 November 2009); https://doi.org/10.1117/12.837598

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