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Applied Physics B

Observations of Autler-Townes spatial splitting of four-wave mixing image

Gaoping Huang, Jia Sun, Weikang Feng, Jiamin Yuan, Zhenkun Wu, Mengzhe Qin, Yiqi Zhang, Yanpeng Zhang

Published Apr 2, 2013• 2 citations
Publisher
DOI
10.1007/s00340-013-5430-5

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Abstract Polarized Autler–Townes (AT) splitting of six-wave mixing (SWM) involving Rydberg atoms is for the first time observed in a thermal vapor cell. By scanning the frequency detuning of the dressing field, AT splitting of Rydberg SWM is compared with that of non-Rydberg SWM with an elliptically polarized probe field. It is demonstrated that the AT spectra are strongly dependent on the interaction between Rydberg atoms. Moreover, AT splitting of SWM is cyclically modulated via a multi-dark state and presented by the corresponding spatial SWM AT splitting images. The theoretical calculations are in good agreement with the experimental results.
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 experimentally report that angle-control dynamics in the nonlinear propagation of the images of the probe, generated four-wave mixing (FWM) and fluorescence signals beams in FWM process in a cascade three-level, as well as a two-level atomic systems. It is shown that, by changing the angles between pumping fields and dressing fields, respectively, the characteristics of the measured signals including the spectra intensity and spatial images can be controlled to display many effects, including the electromagnetically induced transparency and absorption (EIT and EIA, respectively) and Autler-Townes splitting. In particular, we demonstrate the angle-controlled switching from EIA to EIT in probe transmission or from enhancement to suppression in FWM signal. Additionally, we also illustrate the interaction between spatial characteristics and spectra intensities of weak fields. The studies can be very useful in producing all optical-signal-processing devices, such as spatial beam splitters, routers, and switches.