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19 May 2009 Parameter extraction from gratings recorded in photopolymer
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Photopolymer materials are practical materials for use as holographic recording media as they are cheap and maintain high diffraction efficiencies at low noise level. Applications such as holographic data storage require large thickness in order to enable outstanding performance and store many pages of information in small angular steps recorded within the same volume. Such holographic gratings can be recorded by rotating the material sample peristrophically with respect to the recording beams or by altering one or both the incident angles of the recording beams. This results in gratings, which in general having a slanted geometry. Despite the physical significance of the slanted holographic gratings, most of the research presented in literature is based on the simplified unslanted recording geometry. A physically accurate electromagnetic representation of the slanted holographic gratings recorded in photopolymers is necessary in order to extract key material parameters. In this paper we present a model based on a set of two coupled differential equations, which include the effects of: (i) An exponential decay of refractive index modulation in the direction of the beam propagation due to the variation of absorption with depth; and (ii) A linear variation in the spatial period of the grating (i.e. chirp). Numerical and approximate analytical solutions of this model are found. The model is applied to analyze the experimental data in order to extract key volume grating and photopolymer material parameters.
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Dusan Sabol, Michael R Gleeson, and John T. Sheridan "Parameter extraction from gratings recorded in photopolymer", Proc. SPIE 7358, Holography: Advances and Modern Trends, 73580R (19 May 2009);

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