19 February 2018 High dynamic range two-stage photopolymer materials through enhanced solubility high refractive index writing monomers
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Abstract
Holographic photopolymers capable of high refractive index modulations (Δn) on the order of 10-2 are integral for the fabrication of functional holographic optical elements (HOEs) for use in a range of optical applications. A novel high refractive index liquid writing monomer suitable for two-stage photopolymer systems was designed and synthesized. This monomer exhibits facile synthetic procedure, low viscosity, high refractive index as well as excellent solubility in a low refractive index urethane matrix. The solubility limit, refractive index change and reaction kinetics/conversion were studied against a commercial reference high refractive index monomer, 2,4,6-tribromophenyl acrylate (TBPA). Superior performance in solubility to TBPA is shown with similar reaction kinetics and final conversion as confirmed by realtime Fourier transform infrared spectroscopy (FTIR) and real-time monitoring of diffraction grating growth. We demonstrate the ability to load substantial amounts of these writing monomers enabling a straightforward path to higher achievable Δn values (peak-to-mean Δn ~ 0.03) without sacrificing optical properties (transparency, color or scatter) as validated through recording ~100% efficiency volume transmission holograms in sub-15 μm thick films.
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Marvin D. Alim, Marvin D. Alim, Sudheendran Mavila, Sudheendran Mavila, David J. Glugla, David J. Glugla, Chen Wang, Chen Wang, Philip D. Nystrom, Philip D. Nystrom, Amy C. Sullivan, Amy C. Sullivan, Christopher N. Bowman, Christopher N. Bowman, Robert R. McLeod, Robert R. McLeod, } "High dynamic range two-stage photopolymer materials through enhanced solubility high refractive index writing monomers", Proc. SPIE 10558, Practical Holography XXXII: Displays, Materials, and Applications, 105580D (19 February 2018); doi: 10.1117/12.2290029; https://doi.org/10.1117/12.2290029
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