State Key Laboratory of Advanced Optical Communication Systems and Networks, Institute of Quantum Electronics, School of Electronics Engineering & Computer Science, Peking University, Beijing 100871, China.
Opt Lett. 2012 Oct 1;37(19):4059-61. doi: 10.1364/OL.37.004059.
We demonstrate a nonlinear optical filter with ultranarrow bandwidth in cesium vapor. The optical filter operates on the 6S(1/2)→7P(3/2) transition at 455 nm. The single peak transmission at the 6S(1/2), F=4→7P(31/2), F'=5 transition is 9.7% with a bandwidth of 6.2 MHz, whereas at the 6S(1/2), F=3→7P(3/2), F'=2, 3 (cross-over) transition is 6.1% with a bandwidth of 3.9 MHz. The bandwidth approaching the natural linewidth is improved at least two orders of magnitude compared with conventional Faraday anomalous dispersion optical filters. This technique can also be applied to other alkali atoms.
我们在铯蒸气中展示了一种具有超窄带宽的非线性光学滤波器。该滤波器在 455nm 处的 6S(1/2)→7P(3/2)跃迁上工作。在 6S(1/2)，F=4→7P(31/2)，F'=5 跃迁处的单峰透射率为 9.7%，带宽为 6.2MHz，而在 6S(1/2)，F=3→7P(3/2)，F'=2，3（交叉）跃迁处的透射率为 6.1%，带宽为 3.9MHz。与传统的反常 Faraday 色散光学滤波器相比，带宽接近自然线宽的程度提高了至少两个数量级。该技术也可应用于其他碱金属原子。
