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25 August 1994 Nonlinear optical gratings in organic photochromic films
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Proceedings Volume 2212, Linear and Nonlinear Integrated Optics; (1994)
Event: Integrated Optoelectronics '94, 1994, Lindau, Germany
Photoreversible gratings in photochromic organic guest/host systems are written using uv- radiation (363.8 nm) or in the visible (514.5 nm) with diffraction efficiencies up to 7%. Poly(Methyl MethAcrylate) or polyimide are used as guest polymers, doped with the fulgides Aberchrome 540 or 670. The thickness of the films is between 50 and 100 micrometers , the grating constant is 2 - 3 micrometers . By adjusting an additional light source the diffraction efficiency rises (here 17%) and it can be tuned optically. With uv-radiation a permanent grating is written in a crosslinkable polyimide. Due to this crosslinking a selective in-diffusion of an active dye into not illuminated areas of the polyimide (grating constant: 2 micrometers ) takes place. This latent grating of the distributed fulgide molecules can be optically activated additionally to the permanent grating resulting from the photoreaction. The diffraction efficiency can be tuned by a homogeneous illumination.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thiemo Kardinahl and Hilmar Franke "Nonlinear optical gratings in organic photochromic films", Proc. SPIE 2212, Linear and Nonlinear Integrated Optics, (25 August 1994);

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