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Formation and interaction characteristics of two-component spatial weak-light soliton in a four-level double-Λ type system

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Abstract

By using the multiple-scale method, we study analytically the formation and stability of two-component spatial optical solitons in a cold, lifetime-broadened resonant four-level double-Λ type atomic system via electromagnetically induced transparency. It is shown that stable two-component (1+1) dimension spatial optical solitons with extremely weak light intensity can occur, which is different from the passive ones with photorefractive and planar waveguides. Furthermore, the interaction characteristics between two solitons are studied by numerical simulations. We find that the collisional dynamics and the energy transfer of the two solitons are closely correlated with their relative phase shift. Our results may provide a good idea to obtain useful spatial optical solitons for application in optical soliton communications.

© 2010 Optical Society of America

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