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Chinese Physics Letters

Seven Odd-Order Multi-Wave Mixing Spectra in a Five-Level Atomic System

Ruyi Zhang, Liang Li, Jin Li, Ning Li, Zhenkun Wu, Hua Liu, Zhiguo Wang, Huaibin Zheng, Yanpeng Zhang

Published Oct 1, 2011• 0 citations
Publisher

Abstract

In a K-type five-level atomic system, seven odd-order multi-wave mixing (MWM) processes are considered. We can distinguish the MWM signals by selectively blocking different laser beams and changing frequency detuning. We study the interaction in seven odd-order MWM processes in a five-level atomic system and demonstrate the existence of mutual suppression of seven odd-order MWM processes by setting dual electromagnetically induced transparency windows as separated or merged.

DOI
10.1088/0256-307x/28/10/104215

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In a K-type five-level atomic system, seven odd-order multi-wave mixing (MWM) processes are considered. We can distinguish the MWM signals by selectively blocking different laser beams and changing frequency detuning. We study the interaction in seven odd-order MWM processes in a five-level atomic system and demonstrate the existence of mutual suppression of seven odd-order MWM processes by setting dual electromagnetically induced transparency windows as separated or merged.
By selectively blocking specific laser beams, we investigate coexisting seven distinguishable dressed odd-order multi-wave mixing (MWM) signals in a K-type five-level atomic system. We demonstrate that the enhancement and suppression of dressed four-wave mixing (FWM) signal can be directly detected by scanning the dressing field instead of the probe field. We also study the temporal and spatial interference between two FWM signals. Surprisingly, the pure-suppression of six-wave mixing signal has been shifted far away from resonance by atomic velocity component. Moreover, the interactions among six MWM signals have been studied.
We experimentally observe the interplay among coexisting multiwave-mixing (MWM) signals via multiple electromagnetically induced transparency (EIT) windows, including two ladder-type EIT windows and one V-type EIT-like window in a five-level atomic system of Rb85. In the presence of these EIT windows, one can control the interplay between these MWM signals easily by changing the frequency detuning. Meanwhile, we also report the spatial and temporal interferences with a femtosecond time scale among three coexisting MWM signals in two overlapped EIT windows.
We experimentally investigate the interplay between two coexisting six-wave mixing (SWM) signals and the interference between coexisting four-wave mixing (FWM) and SWM signals in a five-level atomic system of 85 Rb. When two electromagnetically induced transparency windows gradually overlap in frequency, the competition between these two SWM signals arises. Moreover, we report the experimental result which shows that the temporal interference with femtosecond time scales between FWM and SWM signals.
Two four-wave-mixing (FWM) processes can coexist in a four-level Y-type atomic system with carefully arranged coupling laser beams. The generated two FWM signal beams fall into two simultaneously opened dual electromagnetically induced transparency (EIT) windows, which can be tuned to overlap or separate by various frequency detunings. The authors report our experimental observation of competing FWM processes, especially mutual suppression of the two FWM signals when the two EIT windows merge in frequency. Controlling FWM processes can have important applications in wavelength conversion for optical communication.
We study the co-existence of multi-wave mixing processes in an open five-level atomic system affected by strong coupling fields. Competition among four-wave mixing （FWM） with two dressing fields, the six-wave mixing （SWM） with one dressing field as well as the eight-wave mixing （EWM） propagating along the same direction can be evoked by adjusting laser beams because these multi-wave mixing signals are induced by atomic coherence between common levels. With the dressing fields properly controlled, the FWM and SWM signals can be suppressed while the EWM signals enhanced in the beam. We also amply analyze the difference between the parallel-cascade and sequentical-cascade doubly dressing mechanisms in doubly-dressed four-wave mixing （DDFWM） processes.