Dynamics of coupled ultraslow optical solitons in a coherent four-state double-¿ system

Published

August 15, 2009

Author(s)

Lu Deng, Guoxiang Huang

Abstract

We present a systematical investigation, both analytical and numerical, on the dynamics of two nearly lossless and distortion-free weak nonlinear optical pulses in a cold, lifetime-broadened four-state double-Λ system via electromagnetically induced transparency. Starting from the equations of motion of atomic response and probe fields, we give a detail derivation of two coupled nonlinear Schr¿odinger equations that control the nonlinear evolution of two probe field envelopes by means of a standard method of multiplescales. We show that stable optical solitons with very slow propagating velocity can be generated under very low input light intensity when working in the transparency window of probe absorption spectrum induced by two continuous-wave control fields. We demonstrate that coupled optical soliton pairs are possible in the system through cross-phase modulational instability and mutual trapping effect of solitons. We provide various coupled optical soliton pair solutions explicitly and analyze their stability numerically.

Citation

European Physical Journal D

Volume

55

Issue

N/A

Pub Type

Journals

Download Paper

https://doi.org/10.1140/epjd/e2009-00233-3

Keywords

Effects of atomic coherence on propagation, absorption, and amplification of light, electromagnetically induced transparency and absorption

Citation

Deng, L. and Huang, G. (2009), Dynamics of coupled ultraslow optical solitons in a coherent four-state double-¿ system, European Physical Journal D, [online], https://doi.org/10.1140/epjd/e2009-00233-3 (Accessed October 17, 2025)