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9 December 2004 Relaxation phenomena in optically activated azo-materials
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The photo-isomerisation of azo-compounds is used to record reversible holographic volume phase gratings in films of guest-host polymers. In situ recording of the diffraction efficiency has been performed for different azo-dyes in the non-polar Poly-methylmethacrylate (PMMA) and the polar Poly-α-methyl-styrene (PαMS) as a matrix. Within an exposure energy of 100 mJ/cm2 a pronounced maximum is observed for s-polarised light. With the light pattern still on this is then reduced to a lower level. In case of the polar matrix, this process can be identified as an interaction of the dye molecules with the polymer matrix.
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Kai Prasuhn, Ansgar Draude, Hilmar Franke, and Roger A. Lessard "Relaxation phenomena in optically activated azo-materials", Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004);

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