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Journal of Physics B Atomic Molecular and Optical Physics

Vacuum induced Aulter–Townes splitting of four- and six-wave mixings in a ring cavity

Zhenkun Wu, Xin Yao, Haixia Chen, Yiqi Zhang, Tao Jiang, Chang Yang, Yanpeng Zhang

Published Apr 14, 2015• 0 citations
Publisher

Abstract

Abstract We demonstrate experimental observation of vacuum Rabi splitting (VRS) of four-wave mixing and six-wave mixing in a collective five-level atomic-cavity coupling system. We study the control of VRS via changing the dressing effect of the vacuum cavity mode; i.e., the cavity mode dressing effect can selectively split the right or left peak when cavity-atom detuning and atom number N are changed. We further report that the cavity window and two electromagnetically induced transparency (EIT) windows induced by the dressing field interfere with each other because of different two-photon conditions they satisfy. Additionally, we investigate the self-dressing field effect on VRS of six-wave mixing (SWM) inside the cavity. Such investigation results can find application in all-optical switches and optical communications.

DOI
10.1088/0953-4075/48/10/105201

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Abstract We demonstrate experimental observation of vacuum Rabi splitting (VRS) of four-wave mixing and six-wave mixing in a collective five-level atomic-cavity coupling system. We study the control of VRS via changing the dressing effect of the vacuum cavity mode; i.e., the cavity mode dressing effect can selectively split the right or left peak when cavity-atom detuning and atom number N are changed. We further report that the cavity window and two electromagnetically induced transparency (EIT) windows induced by the dressing field interfere with each other because of different two-photon conditions they satisfy. Additionally, we investigate the self-dressing field effect on VRS of six-wave mixing (SWM) inside the cavity. Such investigation results can find application in all-optical switches and optical communications.
We report experimental observation of the enhancement and suppression of four-wave mixing and six-wave mixing (SWM) inside a ring cavity containing a rubidium atomic cell. greatly amplifies the SWM enhancement peak and suppression dip, and the vacuum induced Kerr nonlinear phase shift results in the asymmetric phenomenon of the SWM dressing effect. Additionally, we study the power switch and the destructive interference between multi-photon processes. Such investigation results can find applications in all-optical switches and optical communications.
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 theoretically demonstrate the influence of dark and bright states on vacuum Rabi splitting (VRS) and optical bistability (OB) of the multi-wave-mixing (MWM) process in a collective four-level atomic-cavity coupling system. We numerically investigate the multidressed VRS and OB behavior of the zero- and high-order transmitted cavity modes of MWM signals. A further study demonstrates that VRS and self-Kerr nonlinearity OB can coexist and compete with each other in a cascade relationship, based on which we achieve the goal to control VRS and OB simultaneously through the dark state in the atomic system.
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.
We illustrate the experimental observations of Autler-Townes splitting and the spatial splitting in an electromagnetically induced transparency window in a atomic vapor system of D1 line. As the power of the dressing laser beam changes, we study first-order and secondary Autler-Townes splitting. The influences of these dressing beams, which lead to the larger spatial splitting of four-wave mixing and the shift of probe transmission signal with by changing frequency detuning. Studies on such controllable Autler-Townes splitting and spatial splitting effect can be very useful in applications of spatial signal processing and optical communication.
We show that polarization properties of the suppression and enhancement as well as the Autler-Townes (AT) splitting of two coexisting six-wave mixing (SWM) processes in multi-Zeeman levels atomic system. By scanning the frequency detuning of the dressing field, we observe the suppression and enhancement as well as the AT splitting of the two coexisting SWM processes with the different polarized probe beams. Different polarization states of the probe beam can select different transitions among multi-Zeeman levels and different dressing strengths. The AT splitting separations get slightly large as the probe beam changes from the linearly polarized state to the circularly polarized one. Under the conditions of different dressing fields, the polarization dependence of the SWM enhancement and suppression shows the inverse variation. Theoretical calculations are carried out, which are in good agreement with the experimental results.