Electromagnetically induced transparency and nonlinear pulse propagation in a combined tripod and Λ atom-light coupling scheme

被引:20
作者
Hamedi, H. R. [1 ]
Ruseckas, J. [1 ]
Juzeliunas, G. [1 ]
机构
[1] Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio 3, LT-10222 Vilnius, Lithuania
关键词
electromagnetically induced transparency; dark state; combined tripod and Lambda atom-light coupling; DARK OPTICAL SOLITONS; KERR NONLINEARITY; STORAGE; BRIGHT;
D O I
10.1088/1361-6455/aa84f6
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We consider propagation of a probe pulse in an atomic medium characterized by a combined tripod and Lambda (Lambda) atom-light coupling scheme. The scheme involves three atomic ground states coupled to two excited states by five light fields. It is demonstrated that dark states can be formed for such an atom-light coupling. This is essential for formation of the electromagnetically induced transparency (EIT) and slow light. In the limiting cases the scheme reduces to conventional Lambda-or N-type atom-light couplings providing the EIT or absorption, respectively. Thus, the atomic system can experience a transition from the EIT to the absorption by changing the amplitudes or phases of control lasers. Subsequently the scheme is employed to analyze the nonlinear pulse propagation using the coupled Maxwell-Bloch equations. It is shown that a generation of stable slow light optical solitons is possible in such a five-level combined tripod and Lambda atomic system.
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页数:10
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