Abstract
Superluminal sources (SLS) are sources whose propagation velocity can be designed to exceed the speed of light in medium or in vacuum. Examples of SLS are oblique intersection of a pulse of light and a screen,1 moving foci produced during self-focusing of short pulses,2 and polarization/ excitation of medium.3,4 The motion of SLS does not violate causality since they do not transfer information or energy.
© 1996 Optical Society of America
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