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Date : 2008-12-11

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OSA Speckle reduction in laser projection displays ~ Speckle is the main obstacle for the use of laser light sources in projection technology This paper focuses on speckle suppression by the reduction of temporal coherence which is provided by the broadband laser light The investigation of the effect of laser spectrum width and multiple lasers on speckle contrast is discussed

OSA Speckle reduction in laser projection systems by ~ OSA Speckle reduction in laser projection systems by diffractive optical elements In laser projection systems the observer in the far field of the image points on the screen will recognize serious speckle noise

Speckle contrast reduction in laser projection displays ~ In a laser projection display the presence of speckle tends to mask the image information and therefore its reduction is highly desirable Speckle contrast reduction is based on averaging a number of speckle configurations within the spatiotemporal resolution of the detector through diversification of the light parameters Œ

OSA Laser speckle reduction by multimode optical fiber ~ Speckle contrast close to that of white light was obtained using a vibrating fiber bundle with combined temporal spatial and angular diversities of the illumination We report significant speckle reduction in a laser illumination system using a vibrating multimode optical fiber bundle

OSA Versatile method for achieving 1 speckle contrast ~ We propose a method based on quantitative theoretical analysis for achieving speckle contrast of 1 or less in images created by a fullframe laser projection display system The method employs a stationary multimode optical fiber to achieve the effect of using a rapidly moving diffuser but without moving the fiber or any other system component

WO2012139634A1 Laser projector with reduced speckle ~ G02B2748 — Laser speckle optics Speckle reduction arrangements G and optical integrator and laser light source package used in such laser image display WO2010151296A1 Optical laser projection system with moving speckle reducing element and light integration element

Compact and Reliable Speckle Reduction Optotune ~ Example Light engine for laser projector 19 •Effective speckle reduction has been shown usingan axicon as a focusing lens Optotune’s LSR directly followed by a beam homogenizer •Such a setup is compact costsaving and easy to align Red Laser Green Laser Blue Laser Beam combiner Collimation lenses Collecting lens Beam homogenizer

Versatile method for achieving 1 speckle contrast in ~ Trisnadi “Speckle contrast reduction in laser projection Coupling Optics Light Management and Speckle and M S Kovacevic “Comparison of methods for calculating coupling

US6594090B2 Laser projection display system Google Patents ~ A display apparatus includes a laser light source for emitting a light beam a beam expander for expanding the light beam a spatial light modulator beam shaping optics for shaping the expanded laser beam to provide uniform illumination of the spatial light modulator the beam shaping optics including a flys eye integrator having an array of lenslets and a moving diffuser located in the