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IEEE photonics journal

Comparison of Two Two-Photon Dressed Rules in Multi-Wave Mixing

Jia Sun, Peiying Li, Gaoping Huang, Yunzhe Zhang, Dan Zhang, Hao Tian, Heqing Huang, Yanpeng Zhang

Published Jan 31, 2014• 4 citations
Publisher

Abstract

For the first time, we report a novel two-photon dressed rule in a five-level85Rb atomic system. In comparison with a traditional two-photon dressed rule where the signals move with probe field frequency detuning changing, the novel one indicates that the signals do not move with coupling field frequency detuning changing. The finding is verified by the experimentally detected transmitted probe, multi-wave mixing, and fluorescence signals. We also find that the fluorescence signals show Autler-Townes splitting, which are observed experimentally and explained theoretically. By scanning one coupling field frequency detuning, variation of the dressing strength of another coupling field is revealed. Finally, we demonstrate that the alternation can be phase controlled if one of the incident beams deviates an angle (i.e., change from a normal state to an abnormal state).

DOI
10.1109/jphot.2014.2300498

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For the first time, we report a novel two-photon dressed rule in a five-level85Rb atomic system. In comparison with a traditional two-photon dressed rule where the signals move with probe field frequency detuning changing, the novel one indicates that the signals do not move with coupling field frequency detuning changing. The finding is verified by the experimentally detected transmitted probe, multi-wave mixing, and fluorescence signals. We also find that the fluorescence signals show Autler-Townes splitting, which are observed experimentally and explained theoretically. By scanning one coupling field frequency detuning, variation of the dressing strength of another coupling field is revealed. Finally, we demonstrate that the alternation can be phase controlled if one of the incident beams deviates an angle (i.e., change from a normal state to an abnormal state).
For the first time, we present the comparison of Autler–Townes (AT) splitting in fluorescence and six-wave mixing (SWM) signals with electromagnetically induced transparency (EIT). With the detunings of the generating or external-dressing fields scanned, the two signals are distinguished theoretically and investigated experimentally. The EIT separation and AT splitting in fluorescence and SWM can be controlled by a phase determined by the angle in between the incident beams. These phenomena also can be modulated by the incident beam powers. In particular, the anti-AT splitting representing the vanishing tendency of secondary AT splitting is observed.
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.
Abstract We investigate the coherent control of dressing interaction in four-wave mixing (FWM) in a Y-type four-level atomic system based on the dressed states theory. We study the density matrix equation acted by two dressing fields simultaneously governing FWM signal intensity and the eigenvalues under the dressed state formalism. It is shown that the peak position and intensity of Autler–Townes splitting both originate from the dressing interaction as the detuning of the probe field is scanned. Moreover, it is observed that the interaction could be controlled by the dressing fields. Such flexibly controlled nonlinear signal has potential applications in optical communication and quantum information processing.
In this paper, we study the realization of a multi-contact switch using the double-dressing regularity of probe, fluorescence, and six-wave mixing signals in a five-level 85Rb atomic system. For the first time, we compare the dressing regularity of Rydberg states by observing electromagnetically induced transparency and signals. With the scanning probe and dressing fields, both large and small line shifts in signals are observed. The small line shifts are induced by double-dressed line shifts. Also, the big line shifts result from the Rydberg dressing. In addition, with an increase in the principal quantum number n of the Rydberg state, all the signals become weaker, while the line shifts of the signals become enhanced. Using the regularity in line shifts of the signals and an acoustic optical modulator to modulate the frequency detuning, we can realize a multi-contact switch action and fast conversion between different contacts.
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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.