Holographic volume gratings in a glass-like polymer material

摘要

We demonstrate a possibility to write efficient andthermally stable volume holographic gratings in a glassy polymermaterial based on PMMA and phenanthrenequinone withlayers prepared, by casting the liquid solution of ingredients ona substrate and drying to a solid state. A high concentration ofphenanthrenequinone (up to 4mol.%) makes it possible to usephotosensitive layers of lower thicknesses (50–180 μm) for therecording of efficient holographic gratings. The exposing is followedby a thermal amplification of the grating due to diffusionof residual phenanthrenequinone molecules and fixation by anincoherent optical illumination. We present experimental temporalcurves of the refractive index modulation and diffractionefficiency both under the exposure and the heating process. Thebehavior of the gratings under temperatures up to 140 ◦C hasbeen studied.