Coherence creation in an optically thick medium by matched propagation of a chirped-laser-pulse pair

Vecseiné Sándor, Nóra Katalin and Demeter, Gábor and Dzsotján, Dávid and Dzsotjan (Djotyan), Gagik (2014) Coherence creation in an optically thick medium by matched propagation of a chirped-laser-pulse pair. PHYSICAL REVIEW A, 89 (3). ISSN 2469-9926

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Abstract

We consider the simultaneous propagation of a pair of Raman-resonant, frequency-modulated (chirped) laser pulses in an optically thick medium, modeled by an ensemble of Λ-atoms. A self- organization (‘matching’) effect is shown for the chirped pulse pair, which leads to a quasi-lossless propagation. Furthermore, we demonstrate that a well-defined coherent superposition of the atomic ground states and, correspondingly, a coherence is robustly created in the medium that can be controlled by amplitudes of the laser pulses. The proposed scheme can be applied to substantially increase the efficiency of the optical wave mixing processes, as well as in other nonlinear processes where the initial preparation of a spatially extended medium in a coherent superposition state is required.

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