Formation and propagation of coupled ultraslow optical soliton pairs in a cold three-state double-system
- 17 May 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 73 (5), 056606
- https://doi.org/10.1103/physreve.73.056606
Abstract
We investigate the simultaneous formation and propagation of coupled ultraslow optical soliton pairs in a cold, lifetime-broadened three-state double-Lambda atomic system. Starting from the equations of motion of atomic response and two-mode probe-control electromagnetic fields, we derive coupled nonlinear Schrödinger equations that govern the nonlinear evolution of the envelopes of the probe fields in this four-wave mixing scheme by means of the standard method of multiple scales. We demonstrate that for weak probe fields and with suitable operation conditions, a pair of coupled optical solitons moving with remarkably slow propagating velocity can be established in such a highly resonant atomic medium. The key elements to such a shape preserving, well matched yet interacting soliton pair is the balance between dispersion effect and self- and cross-phase modulation effects of the system.Keywords
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