1 December 1996 Investigation of phase specklegram characteristics
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Optical Engineering, 35(12), (1996). doi:10.1117/1.601117
The enhancement of a laser speckle photography technique by means of a modification of the film development procedure is presented. Using a holographic film, an amplitude specklegram can be changed to a phase specklegram. This conversion is achieved during the film development procedure by a controlled bleaching of the exposed film. The contrast and visibility of Young’s fringes reconstructed from a phase specklegram are better than those from an amplitude specklegram. The diffraction efficiency of a phase specklegram is greater than that of an amplitude specklegram. The experimental arrangement and the method to get a phase specklegram are described. The phase specklegram characteristics are presented in detail and experimental results are discussed.
Yaozu Song, Rudi Kulenovic, Manfred Groll, "Investigation of phase specklegram characteristics," Optical Engineering 35(12), (1 December 1996). https://doi.org/10.1117/1.601117

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