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Bulletin of the American Physical Society

Propagation of Broad Spectrum Pulse in EIT Medium

Qingqing Sun, Yuri V. Rostovtsev, Jonathan P. Dowling, Muhammad Suhail Zubairy

Published Mar 4, 2005• 0 citations
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Days on Diffraction•May 1, 2015•2 citations
This report shows that the electromagnetically-induced transparency (EIT) window can be used as a time-to-frequency filter for the probe pulse whose spectrum is much broader than the width of the EIT window. This study demonstrates that the narrow spectral region of the pulse, coincident with the EIT window, develops in a long Gaussian pulse with slow group velocity. An analytical theory is developed describing the propagation of a small amplitude pulse through an optically dense absorptive medium with a narrow EIT window.
It is known that ultrashort pulse coherent propagation through the resonant absorbing medium leads to the pulse splitting and pulse train generation. First of these pulses is the input pulse and the following pulses are resonant medium response. It is also known that such a propagation mode leads to the «spectrum condensation» effect, at which broad-band input femtosecond laser emission, as it leaves opically-dense medium, centralized in the vicinity of the resonance absorption lines. It's interesting to clear up the dependence of a condensation effect on an input femtosecond pulse phase modulation value (chirp).
1D propagation of a THz Gaussian pulse, containing a few cycles, in multi-level media is studied using computer simulation. Electromagnetic field evolution is governed by Maxwell's equations whereas a medium response is described in the frame-work of the density matrix formalism. For the pulse with a sufficiently broad spectrum we demonstrate the appearance of a cascade mechanism for molecule energy level excitation. As a result, the spectrum of the THz pulse, transmitted through a medium layer, is broadened essentially in comparison with the incident pulse spectrum. We also take into account the incident pulse absolute phase influence on the pulse spectrum broadening.