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1 September 1995 Photorefractivity and holographic applications of azo-dye doped PMMA recording materials
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Azo-dye doped polymer (ADP) systems have been the focus of many research groups for realizing various holographic applications for the past twenty years due to their remarkable optical properties such as grainless media, real-time capabilities, dynamic polarization holographic recording, etc. In this paper, we are reporting the photorefractivity of azo-dye doped Poly(methyl methacrylate) (PMMA) films. Under actinic lighting (lambda equals 488 nm), real-time dynamic phase holograms resulting from a local change in refractive index, with reasonable high diffraction efficiency, have been recorded and a maximum of 10% has been achieved. The diffraction efficiency obtained is higher than the similar earlier reported systems. The real-time kinetics of photoreversibility (bleaching and evolution) of azo dyes in PMMA matrices has also been studied. Some interesting applications in optical processing have been realized, exploiting the special properties of ADP systems such as complete auto- reversibility, high rise and erase times, absence of memory effect, and uniform write/read/erase (WRE) cycles.
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Vinh Phuc Pham, Gurusamy Manivannan, and Roger A. Lessard "Photorefractivity and holographic applications of azo-dye doped PMMA recording materials", Proc. SPIE 2554, Growth and Characterization of Materials for Infrared Detectors II, (1 September 1995);

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