Effects of external fields upon 4-wave mixing processes in atomic vapors (A)

G. Grynberg

Junling Che, Jiaqi Ma, Huaibin Zheng +4 more

We experimentally and theoretically investigate the Rydberg six-wave mixing (SWM) process in 85 Rb atomic vapor. Through comparing the center frequency positions of resonant Rydberg SWM signals with different atomic densities, atomic levels induced by van der Waals interaction are observed. Meanwhile, such SWM process which is sensitive to blockade can be modulated by the self-dressing effect and/or external dressing effect. In addition, the Rydberg eight-wave mixing process can be obtained if the power of the external dressing field is low. Such blockaded multi-wave mixing process has potential applications in multi-channel quantum information.

Nicholas P. Economou, Richard R. Freeman, Gary C. Bjorklund

We have observed the effects of magnetic fields on four-wave mixing processes in atomic vapors. We have studied coherent vacuum-ultraviolet generation in Sr vapor via the process omega(1) + omega(2) + omega(3) ? omega(4) in fields of up to 50 kG. Magnetic tuning of the resonances of the third-order nonlinear susceptibility X((3)) was used to modify the dependence of the sum-frequency output power on the generated wavelength.

James J. Wynne, P. P. Sorokin

Richard C. Lind, Duncan G. Steel, Juan Francisco Lam +2 more

Huaibin Zheng, Xun Zhang, Jia Sun +4 more

With electromagnetically induced transparency-assisted configuration, a four-wave mixing (FWM) process generated from the upper branch of a cascade-type three-level atomic system is studied both theoretically and experimentally. Through the advantage of neglecting the absorption of a FWM signal due to a much smaller transition probability of a two-photon process, we easily observe the Autler-Townes effect altering the energy levels in such FWM processes. Meanwhile, the multiplied line shapes of a FWM spectrum are investigated by varying the frequency detuning. By applying external field, such FWM processes can be manipulated through modulating the dark state. Finally, conversion efficiency is considered by changing the temperature of oven, which shows a threshold temperature point. Theoretical interpretations correspond well with the experimental data.