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No matter during the ordinary holograph recording process in photochromic media, or during the polarization holograph recording process in photoinduced anisotropy media, there exits an overshooting peak in the diffraction efficiency, which then decays to a lower permanent level or also to zero, because of the diminishing of fringe contrast caused by a photochemically active readout beam, unequal intensities...
Two kinds of synthesized photochromic fulgide — pyrrylfulgide (F1) and 3-indoly-benzylfulgimide (F2) — are prepared as thin films doped in a polymethyl methacrylate (PMMA) matrix. Under irradiation by 405nm laser, the films convert from the colorless E-form (bleached state) into the C-form (colored state). When the C-forms are irradiated by 488nm, 514nm, 633nm or 650nm laser, the films returns to...
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