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Direct observation of optical precursors in a region of anomalous dispersion

Dawes, Andrew M C, Daniel J. Gauthier, Heejeong Jeong

Published Jan 1, 2005• 0 citations
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Abstract

We observe the creation of optical precursors when a step-modulated optical pulse propagates through a linear resonant absorber. The precursors are the dominant part of the transmitted field, displaying 100% transmission at their maximum amplitude. © 2005 Optical Society of America.

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Direct observation of optical precursors in a region of anomalous dispersion

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We create optical precursors by propagating a step-modulated optical pulse through a linear resonant dielectric absorber. The field emerging from the dielectric consists of a several-nanosecond-long spike with near 100% transmission, which decays to a constant value expected from Beer's law. This high-transmission spike might be useful for imaging applications requiring penetrating optical radiation. We compare our observations to two different theories, revealing that the spike consists of both the Sommerfeld and Brillouin precursors.