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Chinese Physics

Dressed multi-wave mixing in a V-type four-level atomic system

Tong Jiang, Zhang Yan-Peng, Nie Zhi-Qiang, Ling Li, Li Pei-Zhe, Shen Lei-Jian, Fu Xin, Gan Chen-Li, Zhao Rong-Kuo, Jianping Song, Keqing Lu

Published Oct 1, 2007• 0 citations
Publisher

Abstract

The dressed four- and six-wave mixings in a V-type four-level system are considered. Under two different dressed conditions, two- and three-photon resonant Autler–Townes splittings, accompanied by enhancement and suppression of wave mixing signal, are obtained analytically. Meanwhile, an electromagnetic induced transparency of multi-wave mixing is presented, which shows multiple peaks and asymmetric effects caused by one-photon, two-photon and three-photon resonances, separately. The slow light propagation multiple region of multi-wave mixing signal is also obtained.

DOI
10.1088/1009-1963/16/10/028

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The dressed four- and six-wave mixings in a V-type four-level system are considered. Under two different dressed conditions, two- and three-photon resonant Autler–Townes splittings, accompanied by enhancement and suppression of wave mixing signal, are obtained analytically. Meanwhile, an electromagnetic induced transparency of multi-wave mixing is presented, which shows multiple peaks and asymmetric effects caused by one-photon, two-photon and three-photon resonances, separately. The slow light propagation multiple region of multi-wave mixing signal is also obtained.
We report a four-photon resonant nondegenerate eight-wave mixing (NEWM) in a dresses N-type six-level system. It has advantages that phase match condition is not stringent and NEWM signal is enhanced tremendously due to the multiple resonance with the atomic transition frequencies. In the prenence of a strong coupling field, the four-photon resonant NEWM spectrum exhibits Autler-Townes splitting. Compared to two-photon resonant nondegenerate four-wave mixing and three-photon resonant nondegenerate six-wave mixing in dressed atoms, four-photon resonant NEWM spectrum is more complicated and can provides information about the relaxation of higher-order atomic coherence.
We show the enhancement and suppression of a six-wave mixing (SWM) signal in the electromagnetically induced transparency in a five-level 85 Rb atomic system. The results show the Autler—Townes splitting and the enhancement or suppression of SWM, which are caused respectively by a self-dressing effect and by an external dressing effect in the presence of mutual dressing between two SWM signals. In addition, we observe the polarization dependence of the enhancement and suppression of the SWM signals.
The evolution of enhanced four-wave mixing based on Raman coherence as the probe intensity increases is observed experimentally in an 85 R b atomic vapor system. We propose that for a Doppler-broadened Λ -type level system, the generated anti-Stokes field from one-photon resonance will be suppressed by the dressed-states resonance and can be controlled by the probe intensity, which influences the effective transverse relaxation rate of Raman coherence. When the probe field is not so weak, the double resonance for dressed states will greatly suppress the anti-Stokes emission at the central frequency, and the signal peak will be split. We show that this phenomenon is a result of the destructive polarization interference between atoms with different velocities from the two types of resonance. Based on our model, we present a new, to the best of our knowledge, interpretation of four-wave mixing enhancement in the conventional Λ -type electromagnetically induced transparency system.
We report our experimental studies of interplays between four-wave mixing (FWM) processes in multidressed two- and three-level atomic systems. The Autler–Townes splitting of the FWM signal within the electromagnetically induced transparency window has been experimentally observed. Under the same experimental conditions in different energy-level systems, the dressing effects strongly depend on the dipole moments of the transitions, which can provide an easy and qualitative way to determine the orders of magnitude of the effective dipole moments for different transitions by comparing the FWM suppressing effects.
We report an observation of the self- and external-dressed Autler-Townes (AT) splitting in six-wave mixing (SWM) within an electromagnetically induce transparency window, which demonstrates the interaction between two coexisting SWM processes. The multi-dressed states induced by the nested interactions between many dressing fields and the five-level atomic system lead to the primary, secondary and triple AT splittings in the experiment. Such controlled multi-channel splitting of nonlinear optical signals can be used in a range of applications, e.g. the wavelength-demultiplexer in optical communication and quantum information processing.
We study two-photon resonant nondegenerate four-wave mixing (NFWM) in a dressed cascade four-level system. In the presence of a strong coupling field, the two-photon resonant NFWM spectrum exhibits Autler-Townes splitting, accompanied by either suppression or enhancement of the NFWM signal. Such phenomena are demonstrated in Ba through inducing of atomic coherence between the ground state 6s26{s}^{2}6s2 and the doubly excited autoionizing Rydberg state 6pnd6pnd6pnd. This technique provides a spectroscopic tool for measuring not only the resonant frequency and dephasing rate but also the transition dipole moment between two highly excited atomic states.