The unusual nonlinear optical properties of rapidly cooled disordered ferroelectric crystals allow beam spreading to be completely suppressed, irrespective of the beam width and intensity, offering potentially important applications in imaging and all-optical beam control.
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Sukhorukov, A. Diffraction cancellation. Nature Photon 5, 4–5 (2011). https://doi.org/10.1038/nphoton.2010.299
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DOI: https://doi.org/10.1038/nphoton.2010.299
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