Improved performance of volume holographic sol-gel materials—refractive index modulations in the 10–2 range, diffraction efficiencies near 100 %, and low levels of noise scattering—are reported that arise from the incorporation of Zr-based high refractive index species capable of diffusing from dark to bright fringes of the interference pattern (see figure).
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Martinez et al. (2006) studied this question.
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