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We present the first experimental observation of spatial four-wave-mixing in photonic lattices, demonstrating universal aspects associated such processes in periodic media, such as Bloch-wave folding, engineered phase-matching, and ldquoband-controlrdquo of the interaction products.
We show that two Bloch modes launched into a nonlinear photonic lattice can evolve into a supercontinuum of spatial frequencies, exhibiting a sensitive dependence on the momentum difference of the two initially excited modes.
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