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Proceedings Paper

Extracting parameters from slanted non-uniform gratings recorded in photopolymer
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Paper 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.

Paper Details

Date Published: 14 May 2010
PDF: 12 pages
Proc. SPIE 7717, Optical Modelling and Design, 77171I (14 May 2010); doi: 10.1117/12.854493
Show Author Affiliations
Dušan Sabol, Univ. College Dublin (Ireland)
Michael R. Gleeson, Univ. College Dublin (Ireland)
John T. Sheridan, Univ. College Dublin (Ireland)

Published in SPIE Proceedings Vol. 7717:
Optical Modelling and Design
Frank Wyrowski; John T. Sheridan; Jani Tervo; Youri Meuret, Editor(s)

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