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Failure of the group-velocity description for ultrawideband pulse propagation in a causally dispersive, absorptive dielectric

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Abstract

The accuracy of the group-velocity description of dispersive pulse propagation in a double-resonance Lorentz model dielectric is shown to decrease monotonically as the propagation distance increases, whereas the accuracy of the asymptotic description increases monotonically as the propagation distance increases above a single absorption depth in the medium at the pulse carrier frequency.

© 1999 Optical Society of America

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