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Laser Physics Letters

Vacuum induced enhancement and suppression of six-wave mixing in a ring cavity

Xin Yao, Haixia Chen, Zhenkun Wu, Feng Wen, Dan Zhang, Xin He, Yanpeng Zhang

Published Feb 25, 2014• 3 citations
Publisher

Abstract

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.

DOI
10.1088/1612-2011/11/4/045401

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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.
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.
In this article, we experimentally investigate the nonreciprocal bistability (NB) of two six-wave mixing (SWM) processes inside of a ring cavity with a five-level rubidium atomic cell. The degree of NB can be analyzed by the nonreciprocal area (or non-overlapping area) including the frequency offset (in the x-direction) and the intensity difference (in the y-direction) between output states. The frequency offset between the two states of signals is resulting from the Kerr nonlinearity, while the cavity feedback dressing effect determines the intensity difference. Besides, the signals are amplified by the SWM polariton and vacuum induced enhancement. Based on the effect of NB, we study the realization of an all-optical wavelength division multiplexing amplifier (WDMA). The optical contrast and channel equalization radio of this WMDA is contributed from the degree of nonreciprocal area of output states of signals. Such results may have potential applications in all-optical devices and optical communication.
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 enhancement and suppression of the two coexisting six-wave mixing (SWM) processes via atomic coherence have been observed. In the presence of mutual dressing between two SWM signals, the self-dressing effect causes the Autler-Townes (AT) splitting of the SWM signals and the external-dressing effect makes the SWM signals enhanced or suppressed. In addition, the power dependencies of the enhancement and suppression of SWM processes are studied. Theoretical calculations are carried out, which are in good agreement with the experimental results.
The conversion between enhancement and suppression in six-wave mixing (SWM) and fluorescence signals by phase modulation has demonstrated for the first time. It is observed in our experiment the suppression of SWM and fluorescence is transformed into enhancement in company with the switch from electromagnetically induced transparency (EIT) to electromagnetically induced absorption (EIA) in the transmitted probe with the relative phase changed from 0 to π/2. Our research could be potentially applied in optical communication and quantum information processing.
We report experimental studies of bright-state polaritons of four-wave mixing (FWM) and six-wave mixing (SWM) signals through cascade nonlinear optical parametric amplification processes in an atom-cavity composite system for the first time. Also, the coexisting cavity transmission modes of parametrically amplified FWM and SWM signals are observed. Finally, electromagnetically induced absorption by the FWM cavity modes in the probe beam is investigated. The investigations can find potential applications in multi-channel narrow-band long-distance quantum communication.