Extracting parameters from slanted non-uniform gratings recorded in photopolymer

Dušan Sabol; Michael R. Gleeson; John T. Sheridan

doi:10.1117/12.854493

14 May 2010 Extracting parameters from slanted non-uniform gratings recorded in photopolymer

Dušan Sabol, Michael R. Gleeson, John T. Sheridan

Proceedings Volume 7717, Optical Modelling and Design; 77171I (2010) https://doi.org/10.1117/12.854493
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

Despite the physical significance of the slanted holographic gratings, most materials research presented in literature involves the use of the unslanted recording geometry. A physically accurate electromagnetic model of the slanted holographic non-uniform gratings recorded in photopolymers is necessary in order to extract key material parameters. In this paper we present derivation of 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; (ii) Gaussian profile of refractive index modulation due to recording by finite Gaussian beams profile, and (iii) A quadratic variation in the spatial period of the grating (i.e. chirp). The model is applied to fit experimental data, i.e. angular scans, of unslanted gratings recorded in Polyvinylalcohol/Acrylamide material for different slant angles in order to extract key volume grating parameters.

Citation Download Citation

Dušan Sabol, Michael R. Gleeson, and John T. Sheridan "Extracting parameters from slanted non-uniform gratings recorded in photopolymer", Proc. SPIE 7717, Optical Modelling and Design, 77171I (14 May 2010); https://doi.org/10.1117/12.854493

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