Far-field spectrum of the forward emission by an Airy beam in water, as a function of emission angle and wavelength. Airy beams are approximately diffraction-free, but their intensity features freely self-bend on propagation.
From the article:
Filamentation of Femtosecond Laser Airy Beams in WaterPavel Polynkin, Miroslav Kolesik, and Jerome Moloney
Phys. Rev. Lett. 103, 123902 (2009)
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