Lam Mark, Pal Sambit B, Vogt Thibault, Kiffner Martin, Li Wenhui
Opt Lett. 2021 Mar 1;46(5):1017-1020. doi: 10.1364/OL.418618.
We optically excite atoms in a heated vapor cell to a low-lying Rydberg state 10 and observe directional terahertz (THz) beams at 3.3 THz and 7.8 THz. These THz fields are generated by amplified spontaneous emission from the 10 state to the 11 and 8 states, respectively. In addition, we observe ultraviolet (UV) light produced by four-wave mixing of optical pump lasers and the 3.3 THz field. We characterize the generated THz power over the detuning and power of pump lasers, and identify experimental conditions favoring THz and UV generation, respectively. Our scheme paves a new pathway towards generating high-power narrowband THz radiation.
我们在加热的蒸汽池中用光将原子激发到低能级里德堡态10，并观测到3.3太赫兹和7.8太赫兹的定向太赫兹（THz）光束。这些太赫兹场分别由从10态到11态和8态的放大自发辐射产生。此外，我们还观测到光泵浦激光器与3.3太赫兹场的四波混频产生的紫外（UV）光。我们表征了所产生的太赫兹功率随泵浦激光器失谐和功率的变化情况，并分别确定了有利于太赫兹和紫外产生的实验条件。我们的方案为产生高功率窄带太赫兹辐射开辟了一条新途径。
