The formation conditions for holographic gratings in photopolymeric material based on PMMA and phenanthrenequinone featuring high diffraction efficiency and thermal stability are established. The possibilities for their use in radiation coupling systems for planar lightguides are demonstrated.
We demonstrate a possibility to write efficient and thermally stable volume holographic gratings in a glassy polymer material based on PMMA and phenanthrenequinone with layers prepared by casting the liquid solution of ingredients on a substrate and drying to a solid state. A high concentration of phenanthrenequinone (up to 4 mol.%) makes it possible to use photosensitive layers of lower thicknesses (50 - 180 μm) for the recording of efficient holographic gratings. The exposing is followed by a thermal amplification of the grating due to diffusion of residual phenanthrenequinone molecules and fixation by an incoherent optical illumination. We present experimental temporal curves of the refractive index modulation and diffraction efficiency both under the exposure and the heating process. The behavior of the gratings under temperatures up to 140°C has been studied.
Efficient and thermally stable volume holographic gratings in glassy polymeric material based on PMMA and phenanthrenequinone have been recorded. Photosensitive layers were prepared by casting the liquid solution of ingredients on a substrate and drying to a solid state followed by a separation of the polymeric film. This technique was applied to create a possibility to write highly slanted gratings between prisms and to stick them to lightguides with glue. High diffractive efficiencies and moderate angle selectivity of the gratings were reached due to a high concentration of phenanthrenequinone (up to 4 mol.%) making it possible to use the photosensitive layers of lower thicknesses (60 - 150 μm) for the recording of the efficient holographic gratings. The exposing is followed by thermal amplification of the grating due to diffusion of unreacted phenanthrenequinone molecules and fixation by an incoherent optical illumination. The processes of generation, amplification and fixation are discussed for holographic gratings. The holographic gratings were written with an Ar-laser (wavelength 514,5 nm). The grating amplification was realized by heating up of the sample to 50-85°C.
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