Studies On The Optical Storage Characteristics Of A New Kind Of Bisazo Dye Doped Polymer Films

A new kind of bisazo(BA1) was synthesized as a material candidate for perpetual information storage application. When the sample was pumped by the beam of 532 nm, some BA1 molecules underwent a reversible trans–trans to cis–cis isomerization in the polymer matrix, resulting in photo-induced birefringence. Hence, the photo-induced birefringence was investigated at various concentrations and the dependence of the transmission signals on the pumping beam intensities in BA1 doped poly (methyl methacrylate) (PMMA) film was studied, Photoisomerization and molecular orientation theory used to explain the experiment results. A reasonable theory was given to explain the dynamic process .The two types of polarization holographic (parallel state (SS) and orthogonal state (SP)) recording in BA1 doped PMMA films were studied. Self-diffracted holographic gratings were optically recorded with a pair of interferential He–Ne laser beams (632.8nm). Reversible holograms were recorded in the medium.