| We studied the holographic behavior of poly(vinyl alcohol) films doped with Janus Green and Methyl Orange. The reversible cis-trans photoisomerisation and bleaching mechanism induced by 647.1 nm light allows the recording of amplitude and phase holograms in the dye-doped polymer matrices. We optimized the following parameters: thickness of the film, dye concentration, power of the writing beams, pH of the polymer solution and the molecular weight of the polymer. Diffraction efficiencies up to 1% have been attained. The storage time can be as long as 800 s and 100 s for the Janus Green and the Methyl Orange. We used polarisation holography in real-time holographic interferometry. With a holographic camera optical setup, we obtained real-time fringes displacement with a diffusing object. |
