Wu Jinze, Guo Miaojun, Zhou Haitao, Liu Jinhong, Li Jinhong, Zhang Junxiang
Opt Express. 2022 Apr 11;30(8):12576-12585. doi: 10.1364/OE.452790.
Nondegenerate four-wave mixing (FWM) in diamond-type atomic systems has important applications in a wide range of fields, including quantum entanglement generation, frequency conversion, and optical information processing. Although the efficient self-seeded nondegenerate FWM with amplified spontaneous emission (ASE) has been realized extensively, the seeded nondegenerate FWM without ASE is inefficient in reported experiments so far. Here we present the experimental realization of the seeded nondegenerate FWM in cesium atoms with a significantly improved efficiency. Specifically, with two pump lasers at 852 and 921 nm and a seed laser at 895 nm, a continuous-wave laser at 876 nm is efficiently generated via FWM in a cesium vapor cell with a power up to 1.2 mW, three orders of magnitude larger than what has been achieved in previous experiments. The improvement of the efficiency benefits from the exact satisfaction of the phase-matching condition realized by an elaborately designed setup. Our results may find applications in the generation of squeezing and entanglement of light via nondegenerate FWM.
钻石型原子系统中的非简并四波混频（FWM）在包括量子纠缠产生、频率转换和光信息处理等广泛领域有着重要应用。尽管具有放大自发辐射（ASE）的高效自种子非简并FWM已被广泛实现，但迄今为止，在已报道的实验中，无ASE的种子非简并FWM效率较低。在此，我们展示了在铯原子中种子非简并FWM的实验实现，其效率有显著提高。具体而言，利用852和921 nm的两个泵浦激光器以及895 nm的种子激光器，在铯蒸气池中通过FWM高效产生了876 nm的连续波激光器，功率高达1.2 mW，比之前实验所达到的功率大三个数量级。效率的提高得益于精心设计的装置实现了相位匹配条件的精确满足。我们的结果可能在通过非简并FWM产生光的压缩和纠缠方面找到应用。
