Deng L, Kozuma M, Hagley E W, Payne M G
Electron & Optical Physics Division, NIST, Gaithersburg, Maryland 20899, USA.
Phys Rev Lett. 2002 Apr 8;88(14):143902. doi: 10.1103/PhysRevLett.88.143902. Epub 2002 Mar 20.
We show that by strongly modifying the dispersion properties of a four-level system, non-existing wave mixing channels can be opened and significantly enhanced. Specifically, we show that coherent optical four-wave mixing with a pump wave mediated by electromagnetically induced transparency (thereby propagating with an extremely slow group velocity) will lead to many orders of magnitude enhancement in the amplitude of the generated wave. Contrary to common belief, a large transparency window, which causes a large propagation velocity, actually diminishes efficient mixing wave production.
我们表明，通过强烈改变四能级系统的色散特性，可以打开并显著增强原本不存在的波混频通道。具体而言，我们表明，由电磁诱导透明介导的与泵浦波的相干光学四波混频（从而以极慢的群速度传播）将导致所产生波的幅度增强许多个数量级。与通常的看法相反，导致大传播速度的大透明窗口实际上会减少有效混频波的产生。
