Abstract
A dynamic light scattering liquid crystal (DLS-LC) device is applied to reduce speckle from a laser pico-projector. The DLS-LC device produces time-varying scattering patterns, which can decrease the degree of spatial and temporal coherence of the laser and achieve a very effective reduction in the speckle. The influence of the amplitude and frequency of the applied electric field for the DLS-LC device on the light scattering characteristics and speckle contrast are studied. The speckle contrast is reduced by as much as 62% with a low electric field amplitude (4.2 V/μm).
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