OPJ  Vol.2 No.4 , December 2012
Speckle Reduction in Imaging Projection Systems
Abstract: Diffractive diffusers (phase gratings) are routinely used for homogenizing and beam shaping for laser beam applications. Another use for diffractive diffusers is in the reduction of speckle for pico-projection systems. While diffusers are unable to completely eliminate speckle they can be utilized to decrease the resultant contrast to provide a more visually acceptable image. Research has been conducted to quantify and measure the diffusers overall ability in speckle reduction. A theoretical Fourier optics model is used to provide the diffuser’s stationary and in-motion performance in terms of the resultant contrast level. Contrast measurements of two diffractive diffusers are calculated theoretically and compared with experimental results. Having a working theoretical model to accurately predict the performance of the diffractive diffuser allows for the verification of new diffuser designs specifically for pico-projection system applications.
Cite this paper: W. Thomas and C. Middlebrook, "Speckle Reduction in Imaging Projection Systems," Optics and Photonics Journal, Vol. 2 No. 4, 2012, pp. 338-343. doi: 10.4236/opj.2012.24042.

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