Terahertz emitting and FWM (Four wave mixing) processes in 6P_3/2→11D_J near-resonating pumped cesium vapor are studied in this work. Using a nanosecond 550 nm pump laser, collimated frequency converted lights around 557 nm and 563 nm are observed in cesium vapor. A detailed analysis shows that the frequency converted lights come from FWM processes driven by the pump laser and stimulated terahertz emissions in the frequency range of 1–7 THz. These stimulated terahertz emissions are generated by cesium atom SERS (stimulated electronic Raman scattering) or ASE (amplified spontaneous emission) under pumping. The terahertz emission iQEs (internal quantum efficiency) are estimated to be on the order of 1 E -3 ~ 1 E -2 as their lower limits. Results of this work will contribute to studies on atom FWM physics, terahertz light source and detector based on atom vapor.

6P _3/2 →11D _J中的太赫兹发射和FWM（四波混频）过程在这项工作中研究了近共振泵浦铯蒸气。使用纳秒级550 nm泵浦激光器，在铯蒸气中观察到了约557 nm和563 nm的准直变频光。详细分析表明，变频光来自泵浦激光器驱动的FWM过程，并在1–7 THz的频率范围内激发了太赫兹发射。这些激发的太赫兹发射是由泵浦下的铯原子SERS（激发的电子拉曼散射）或ASE（放大的自发发射）产生的。太赫兹发射iQE（内部量子效率）的下限值估计为1 E -3〜1 E -2。这项工作的结果将有助于研究原子FWM物理，太赫兹光源和基于原子蒸气的探测器。