• C Sudha Kartha

      Articles written in Pramana – Journal of Physics

    • Recording multiple holographic gratings in silver-doped photopolymer using peristrophic multiplexing

      V Pramitha Rani Joseph K Sreekumar C Sudha Kartha

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      Plane-wave transmission gratings were stored in the same location of silver-doped photopolymer film using peristrophic multiplexing techniques. Constant and variable exposure scheduling methods were adopted for storing gratings in the film using He–Ne laser (632.8 nm). The role of recording geometry on the dynamic range of the material was studied by comparing the results obtained from both techniques. Peristrophic multiplexing with rotation of the film in a plane normal to the bisector of the incident beams resulted in better homogenization of diffraction efficiencies and larger $M /#$ value.

    • Reflection mode holographic recording in methylene blue-sensitized polyvinyl alcohol acrylamide films

      C S Rajesh R Anjana S S Sreeroop C Sudha Kartha

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      Photopolymer systems can produce good image quality holograms that does not require any post-processing and are environmentally stable with good diffraction efficiency. The present work reports the development of a methylene blue-sensitized polyvinyl alcohol acrylamide (MBPVA/AA) photopolymer system for recording white light reflection holograms. Reflection gratings were recorded in the photopolymer films with different concentrations of methylene blue (MB). Various parameters affecting the holographic properties of the samples were also studied. The holographic performance of the material is found to depend on its chemical composition and the recording parameters.

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