自发相干展宽寿命原子介质中的线性和非线性脉冲调制
Linear and Nonlinear Pulse Propagations in Lifetime-Broadened Atomic Media with Spontaneously Generated Coherence
摘要：
对具有自发产生相干效应的寿命展宽三态介质中的线性和非线性脉冲传输进行了理论研究。三个通用系统的V，$Λ$，和$Ξ$型水平配置被认为是和比较。结果表明，在线性传输区，V型系统中的SGC能引起色散和吸收的显著变化，可以用来完全消除吸收，大幅度降低探测场的群速度。然而，SGC对$Λ$型和$Ξ$型系统的分散和吸收没有影响。在非线性传输区，不同系统的SGC对克尔非线性的影响不同。具体而言，它可以增强V型系统的克尔非线性，而减弱$Λ$型系统的克尔非线性。在V型系统中，利用单激光场就可以产生具有超低传输速度和很低泵浦功率的稳定光孤子。
英文摘要：
The linear and nonlinear pulse propagations in lifetime-broadened three-state media with spontaneously generated coherence (SGC) are investigated theoretically. Three generic systems of V-, $Λ$-, and $Ξ$-type level configurations are considered and compared. It is shown that in linear propagation regime the SGC in the V-type system can result in a significant change of dispersion and absorption and may be used to completely eliminate the absorption and largely reduce the group velocity of a probe field. However, the SGC has no effect on the dispersion and absorption of the $Λ$- and $Ξ$-type systems. In nonlinear propagation regime, the SGC displays different influences on Kerr nonlinearity for different systems. Specifically, it can enhance the Kerr nonlinearity of the V-type system whereas weaken the Kerr nonlinearity of the $Λ$-type system. Using the SGC, stable optical solitons with ultraslow propagating velocity and very low pump power can be produced in the V-type system by exploiting only one laser field in the system.
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