Abstract
Speckle from coherent light sources continues to be a limiting factor in the design and manufacturing of laser projectors. Utilizing diffractive diffusers has been an effective method for reducing monochromatic speckle contrast. Color laser projection devices require the use of red, green, and blue laser sources therefore; using a monochromatic diffractive diffuser may not be optimal for color speckle contrast reduction. A new static dual-diffuser system utilizing Hadamard matrices has been designed to reduce full color speckle. This paper analyzes the effectiveness of the new Hadamard diffusers in reducing speckle using three separate RGB laser diodes. A simulation of the Hadamard diffusers is conducted to determine the optimum spacing between the two diffusers for polychromatic speckle reduction. Experimental measured results are presented using the optimal spacing of Hadamard diffusers for RGB color speckle reduction showing 60% reduction in contrast.
Highlights
Handheld electronic device size continues to decrease while ever increasing in capabilities
Laser diodes can be integrated into electronic devices and are able to provide a bright high resolution image while providing a large color gamut
In order to fully utilize diffusers in projector applications polychromatic speckle reduction is examined within this paper
Summary
Handheld electronic device size continues to decrease while ever increasing in capabilities. Speckle is a granular irregularity in the laser image caused by the interference of the light reflected from a rough surface. The eye observes this interference pattern – speckle – as a visual disturbance leading to headaches or eye irritations [1]. In order to fully utilize diffusers in projector applications polychromatic speckle reduction is examined within this paper. Dual Hadamard matrix diffusers (DHDs) can be utilized for contrast reduction in polychromatic speckle reduction applications. The polychromatic laser setup needed to measure the speckle contrast resulting from DHDs is performed within this work. Each wavelength and full color speckle is measured across varying distances between simulated DHD
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