Abstract
We discuss recent experimental work demonstrating spatial dispersive shock waves (DSWs). These structures occur whenever nonlinearity enhances diffraction so that wave spreading becomes intensity-dependent. The mechanism of this spreading follows naturally from a hydrodynamic description of light flow, in which wave steepening from phase gradients allows faster parts of a beam to overtake slower parts. Scaling relationships are developed for this spreading and experimentally observed, in both local and nonlocal media.
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