论文标题
两个对称的四波混合信号在具有异常折射率的介质中产生
Two symmetric four-wave mixing signals generated in a medium with anomalous refractive index
论文作者
论文摘要
我们报告了在rubidium蒸气中产生的两个简并四波混合的对称信号的实验和理论结果。两个非线性信号均由两个几乎连接的激光光束诱导，$ \ vec {k} _ {a} $和$ \ vec {k} _ {b} $ wave-vectors，并同时检测到$ 2 \ vec {k} _ {a} $ {a} a} a} - { $ 2 \ vec {k} _ {b} - \ vec {k} _ {a} $方向。在每个方向上，当两个光束在封闭的过渡$^{85} $ rb $ 〜5S_ {1/2}（f = 3）\ rightArrow 5p_ {3/2}（f = 4）$上时，我们会观察到一个峰。激发光谱揭示了两个峰之间的频率分离很小，这在考虑到传播效应时可以解释。此外，我们的理论分析表明，只有在包括电磁诱导的吸收等相干效应（例如电磁吸收）之类的相干效果时，才能获得对每个峰的频率位置的正确描述。
We report experimental and theoretical results of two symmetrical signals of degenerate four-wave mixing generated in rubidium vapor. Both nonlinear signals are induced by two almost copropagating laser beams, with $\vec{k}_{a}$ and $\vec{k}_{b}$ wave-vectors, and detected simultaneously in the $2\vec{k}_{a}-\vec{k}_{b}$ and $2\vec{k}_{b}-\vec{k}_{a}$ directions. In each direction, we observe a single peak when the two beams are tuned on the closed transition $^{85}$Rb$~5S_{1/2} (F=3) \rightarrow 5P_{3/2} (F=4)$. The excitation spectra reveal a small frequency separation between the two peaks, which is explained when propagation effects are taken into account. Furthermore, our theoretical analysis shows that a correct description of the frequency position of each peak is obtained only if coherent effects such as electromagnetically induced absorption are included.
