Solid Film with Rewritable Azo based Photopolymer

Discussion in 'Alternative Processes' started by Mustafa Umut Sarac, Aug 23, 2012.

  1. Mustafa Umut Sarac

    Mustafa Umut Sarac Subscriber

    Oct 29, 2006
    35mm RF
    I am researching rewritable photopolymers since 1995. I looked to google and found that. That can be used with cameras easily , sensivity is for 500nm era and when it goes back to dark , turns itself again. This technology is for space based telescopes correction for aberrations in real time with real time holograms

    The development of practical optical holographic
    devices requires sensitive and fast dynamic holographic
    recording media. Organic molecules have
    attracted particular attention. Examples include
    azo-dye molecules in polymer hosts,
    ' pure nematic
    liquid crystals,2 and polymeric liquid crystals.3 Here
    we describe real-time holography in azo-dye-doped
    nematic liquid crystals. Our motivation is to find
    novel materials for dynamic holography. The attraction
    of the materials that we consider is the photosensitivity
    of the azo-dye molecules and the large
    birefringence of the liquid-crystal molecules.
    We have recorded holograms by introducing
    Methyl Red sodium salt, 4-dimethylaminoazobenzene-
    2'-carboxylic acid (from Sigma), which is
    an azo-dye molecule, into 4'-pentyl-4-biphenylcarbonitrile
    (PCB, from Aldrich), a nematic liquidcrystal
    host. The Methyl Red molecules are known
    to undergo cis-trans-photoisomerization. 4 At room
    temperature, the trans-isomer is stable. However,
    the molecular conformation changes to the cisisomer
    when exposed to light polarized along the
    extended trans-form. In darkness, or when exposed
    to light at a wavelength outside the absorption
    band of the trans-isomer, the cis-isomer relaxes
    back to the trans-state.


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