Analysis of the addition of a crosslinking agent in pyrromethene-HEMA based photopolymerizable holographic recording materials

S. Blaya; P. Acebal; L. Carretero; R. F. Madrigal; A. Murciano; A. Fimia

doi:10.1117/12.886900

11 May 2011 Analysis of the addition of a crosslinking agent in pyrromethene-HEMA based photopolymerizable holographic recording materials

S. Blaya, P. Acebal, L. Carretero, R. F. Madrigal, A. Murciano, A. Fimia

Author Affiliations +

Proceedings Volume 8074, Holography: Advances and Modern Trends II; 80740V (2011) https://doi.org/10.1117/12.886900
Event: SPIE Optics + Optoelectronics, 2011, Prague, Czech Republic

Abstract

In this work, we present the analysis of a photopolymerizable system based on pyrromethene dye (PM567) acting as a photoinitiator and HEMA as monomer both of them dissolved in a dry polymeric matrix of PMMA. Previously, we reported the recording of diffraction gratings in this composition, resulting in diffraction efficiencies near 60 % with exposures of 1 J/cm² in materials with thicknesses around 500 microns. Although, the mentioned response (best) was observed at low intensities but at higher ones lower diffraction efficiencies were reached. Furthermore, in all the studied cases inhibition periods with asymmetrical angular selectivity curves were obtained. Since, in order to solve the mentioned drawbacks, the aim of this work is to analyze the effect of the addition of a crosslinking agent (PETA) in a photopolymerizable holographic material based on a pyrromethene dye (PM567) acting as a photoinitiator and HEMA as monomer both of them dissolved in a dry polymeric matrix of PMMA. For this, diffraction gratings were recorded at different intensities and the energetic evolution of the diffraction efficiency as well as the observed inhibition period were studied as a function of the concentration of crosslinking agent. Moreover, the experimental angular selectivity curves were theoretically analyzed by the model of Kubota and Uchida, and as a result information such as the effective thickness, fringe bending and non-uniform index modulation against the thickness of grating was obtained.

Citation Download Citation

S. Blaya, P. Acebal, L. Carretero, R. F. Madrigal, A. Murciano, and A. Fimia "Analysis of the addition of a crosslinking agent in pyrromethene-HEMA based photopolymerizable holographic recording materials", Proc. SPIE 8074, Holography: Advances and Modern Trends II, 80740V (11 May 2011); https://doi.org/10.1117/12.886900

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