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Airy function
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=== Optics === A transversally asymmetric optical beam, where the electric field profile is given by the Airy function, has the interesting property that its maximum intensity ''accelerates'' towards one side instead of propagating in a straight line as is the case in symmetric beams. This is at expense of the low-intensity tail being spread in the opposite direction, so the overall momentum of the beam is of course conserved.
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