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Journal of Physics B Atomic Molecular and Optical Physics

Controllable nonlinear optical processes in six-wave mixing and fluorescence channels

Zhaoyang Zhang, Yunzhe Zhang, Feng Wen, Haixia Chen, Weikang Feng, Huaibin Zheng, Yanpeng Zhang

Published Mar 14, 2014• 0 citations
Publisher

Abstract

For the first time, we experimentally study the phase control of the coexisting dressed probe signal, six-wave mixing and fluorescence signals in a five-level K-type atomic system by adjusting the angle between the probe signal and certain coupling beams. Such phase controlling results in a switch between bright and dark states. In addition, by using different hyperfine levels of the K-type atomic system as the ground state, the magnitude of the dressing effect is manipulated. The mechanisms of the three types of nonlinear processes are investigated by changing the frequency detuning and powers of the coupling laser beams. In addition, we study the interference and competition among the involved beams in nonlinear optical processes. Such controllable nonlinear processes could have potential applications in optical communication and quantum information processing.

DOI
10.1088/0953-4075/47/7/075401

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For the first time, we experimentally study the phase control of the coexisting dressed probe signal, six-wave mixing and fluorescence signals in a five-level K-type atomic system by adjusting the angle between the probe signal and certain coupling beams. Such phase controlling results in a switch between bright and dark states. In addition, by using different hyperfine levels of the K-type atomic system as the ground state, the magnitude of the dressing effect is manipulated. The mechanisms of the three types of nonlinear processes are investigated by changing the frequency detuning and powers of the coupling laser beams. In addition, we study the interference and competition among the involved beams in nonlinear optical processes. Such controllable nonlinear processes could have potential applications in optical communication and quantum information processing.
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We first investigate the phase control of the switch between bright and dark states in the transmitted probe, four-wave mixing (FWM) and fluorescence signals in a four-level 85Rb atomic system. With the relative phase modulated from 0 to −π, pure dark state in the FWM and fluorescence channels can be switched to pure bright state, corresponding to the switch from electromagnetically induced transparency to electromagnetically induced absorption. Meanwhile, the results could be obtained in solid crystals. Such phase controlled switch could have potential applications in optical communication and quantum information processing.
We demonstrate different dressed processes of four-wave mixing (FWM), as changing the powers of the probe, pump, and dressing fields, respectively, in ladder-type three-level system. It is demonstrated that scanning detuning of the dressing field can lead to the direct detection of the dressing effects and the interaction between the dressing fields, compared with scanning that of the probe field. Moreover, by respectively controlling the powers of the dressing, pump, and probe fields, the enhancement and suppression of FWM signals can be switched sensitively. Meanwhile, the spatial splitting in y direction of FWM signal due to the cross-phase modulation and electromagnetically induced gratings is observed, respectively. Such nonlinear signal with switchable enhancement has potential applications in optical switching, optical communication, and quantum information processing.
Abstract For the first time, we have experimentally and theoretically researched the double dressing effect on the six wave mixing photonic band gap signal (SWM BGS), probe transmission signal (PTS) and fluorescence signal (FLS) in an inverted Y-type four level atomic system. We investigate the characteristics of the SMW BGS, PTS and FLS, which can be controlled by beam, power and detuning. At the same time, the relative phase which is caused by the incident angle of dressing beams plays a vital role in modulating the intensity of the SWM BGS, PTS and FLS. Such a scheme has potential applications in optical diodes, amplifiers and quantum information processing.
In two-level as well as V-type three-level atomic systems, we study probe transmission, four-wave mixing (FWM) and fluorescence signals with dressing effect experimentally and theoretically. We find both the hyperfine structure (at the same energy level) and the transition dipole moment (at different energy levels) can affect the dressing effect. We also experimentally investigate that angle-control dynamics in the nonlinear propagation of the images of the probe and generated FWM in two-level atomic systems, and find that the focusing and defocusing of probe beam and FWM signals can be greatly affected by the angles between dressing fields.
Two doubly dressing (parallel and nested processes) schemes are considered which generate co-existing four-wave mixing (FWM), six-wave mixing (SWM) and eight-wave mixing (EWM) processes in an open five-level atomic system. The coherent interaction between two dressing processes in nested type is much stronger than that in parallel type. The singly enhanced SWM and dually enhanced FWM channels can be opened at the same time. Such dramatic enhancements in high-order nonlinear optical processes result from the constructive interactions of double dark resonances. The giant third-, fifth- and seventh-order nonlinear responses with different signs can be obtained by using the coherent phase controls of the polarization beats between the FWM, SWM and EWM signals.