Analysis of the effect modification of the photoinitiator system in pyrromethene-HEMA based photopolymerizable holographic recording materials

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

doi:10.1117/12.886947

11 May 2011 Analysis of the effect modification of the photoinitiator system 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; 80740W (2011) https://doi.org/10.1117/12.886947
Event: SPIE Optics + Optoelectronics, 2011, Prague, Czech Republic

Abstract

The aim of this work is to analyze the effect of the addition or substitution of several components (coinitiator and photoinitiator) 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 component that has been modified (coinitiator (tert-butyl peroxybenzoate (tBPH)) or photoinitiator PM546 and PM556). 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. It is observed that when PM546 is used instead of PM567, better responses for a wide range of intensities are obtained, in particular at high intensity where gratings with low fringe bending and a relative constant index modulation against thickness is reached. When a coinitiator such as tert-butyl peroxybenzoate (tBPH) is added to the reference composition, shorter inhibition periods are obtained with low fringe bending but with lower diffraction efficiencies.

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S. Blaya, P. Acebal, L. Carretero, R. F. Madrigal, A. Murciano, and A. Fimia "Analysis of the effect modification of the photoinitiator system in pyrromethene-HEMA based photopolymerizable holographic recording materials", Proc. SPIE 8074, Holography: Advances and Modern Trends II, 80740W (11 May 2011); https://doi.org/10.1117/12.886947

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KEYWORDS

Modulation

Diffraction

Diffraction gratings

Holography

Holographic materials

Absorption

Fringe analysis

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