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Coherent pulse propagation in water

Ellis, Armin T., Fox, Anna E., Heejeong Jeong, Lukofsky, David, Ulf L. Österberg

Published Jan 1, 2007• 0 citations
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Abstract

We show how transmission through 5.7 meters of water varies with pulse energy and temporal width. 3 orders increase in transmission is observed compared with Beer's law predictions. The experimental results are compared with 0π-pulses. © 2007 Optical Society of America.

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The recent interest in precursors has been fuelled by the possibility of using them for the efficient transmission of information through absorbing media at radio or optical frequencies. Here we demonstrate that the low attenuation experienced by the Brillouin precursor is attributed to the inherently low absorption of dispersive media near DC, a characteristic already exploited with communications systems using the extremely low frequency (ELF) band. Pulses, regardless of their temporal width and carrier frequency, always obey Beer's law as long as they propagate in the linear time invariant regime. We conclude with an FDTD simulation of the Maxwell-Bloch equations that shows how optical coherent bleaching effects, which take place in the linear time variant regime of the Lorentz oscillator model, can cause sustained deviations from Beer's law over relatively long distances of water.
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We describe the temporal and spatial dynamics of propagating electromagnetically induced transparency pulses in an optically thick medium. Results include pulse velocities as slow as c/165c/165c/165 with 55% transmission, strong-probe-field effects, and the observation of near diffraction-limited transmitted beam quality.