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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 20 — Sep. 28, 2009
  • pp: 18279–18291

In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation

Sergi Gallego, Andrés Márquez, Stephan Marini, Elena Fernández, Manuel Ortuño, and Inmaculada Pascual  »View Author Affiliations

Optics Express, Vol. 17, Issue 20, pp. 18279-18291 (2009)

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Molecular diffusion effects have been widely studied inside photopolymers for holographic applications. Recently some works have focused on low spatial frequencies to evaluate in real time the monomer diffusion effects. Assuming a Fermi-Dirac function-based profile, we have fitted the diffracted intensities, reflected and transmitted (up to the 8th order), to obtain the phase and surface profile of the recorded gratings. We have studied the influence of diffusion in polyvinyl-alcohol/acrylamide for the range of spatial frequencies between 2 lines/mm and 6 lines/mm. We have demonstrated the influence of the spatial frequency on the magnitude and sign of the material volume variations. We also studied in dark the evolution of the grating shape. We show that it is possible to achieve diffractive gratings with diffraction efficiency in the first order near 35% if the in dark evolution is taken into account. Furthermore we present a method to calculate the monomer diffusivity in photopolymers. The differential equation is deduced and solved, and experimental average value is obtained (D=1.1·10−8 cm2s−1).

© 2009 OSA

OCIS Codes
(160.5470) Materials : Polymers
(290.1990) Scattering : Diffusion

ToC Category:

Original Manuscript: July 8, 2009
Revised Manuscript: August 18, 2009
Manuscript Accepted: September 2, 2009
Published: September 25, 2009

Sergi Gallego, Andrés Márquez, Stephan Marini, Elena Fernández, Manuel Ortuño, and Inmaculada Pascual, "In dark analysis of PVA/AA materials at very low spatial frequencies: phase modulation evolution and diffusion estimation," Opt. Express 17, 18279-18291 (2009)

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