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J. E. Harvey, “Fourier Treatment of Near-Field Diffraction Theory,” American Journal of Physics, Vol. 47, No. 11, 1979, pp. 974-980. doi:10.1119/1.11600

has been cited by the following article:

• TITLE: Speckle Reduction in Imaging Projection Systems

  AUTHORS: Weston Thomas, Christopher Middlebrook

  KEYWORDS: Diffractive Diffusers; Speckle Contrast Reduction; Laser Pico-Projectors

  JOURNAL NAME: Optics and Photonics Journal, Vol.2 No.4, December 31, 2012

  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.