Thermally assisted recording of holographic gratings in semicrystalline azobenzene-containing polymers

摘要

We examine optically induced birefringence in semicrystalline azopolymer films that are hold at glass-transition temperature T-g. The birefringence increases markedly after interception of the pump beam; the saturation value depends on exposure time. In addition, the induced birefringence is completely erased by irradiation with a circularly polarized beam at T-g. Using this thermally assisted method, we demonstrate the holographic recording of a test image. The intensity of the diffracted beam also increases after interception of the writing beams. Furthermore, the retrieved image is found to have a resolution of similar to30 lp/mm. This resolution is comparable with that of the optical setup that is used. Accordingly, the thermally assisted recording by use of semicrystalline azopolymers is a promising method for reversible holographic storage. (C) 2002 Optical Society of America. [References: 26]