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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Absolute calibration of the refractive index in photo-induced photonic lattices.
Optics Express 2014 August 26
We demonstrate a method to experimentally calibrate the refractive index modulation in photorefractive lattices, a task rarely addressed that is crucial for quantitative comparisons of theories with experiments. We consider the linear propagation of a normally incident plane wave through simple lattices and its modulation amplitude at crystal output face. Finding no evidence of longitudinal (Talbot-like) oscillations, we discard an ideal propagation theory and construct a simple effective model that includes longitudinal relaxation. We obtain calibrations of 1D and 2D lattices consistent with standard theory in a high saturation regime. For 2D lattices, we find anisotropies χ = 1.5 - 2.5, stronger for smaller lattice period, and refractive indexes larger than for 1D lattices, also with more noise.
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