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IEEE Journal of Quantum Electronics

Dressed Four-Wave Mixing From Upper Branch in a Sodium Atomic Vapor

Huaibin Zheng, Xun Zhang, Jia Sun, Changbiao Li, Zhaoyang Zhang, Haixia Chen, Yanpeng Zhang

Published Dec 5, 2012• 4 citations
Publisher

Abstract

With electromagnetically induced transparency-assisted configuration, a four-wave mixing (FWM) process generated from the upper branch of a cascade-type three-level atomic system is studied both theoretically and experimentally. Through the advantage of neglecting the absorption of a FWM signal due to a much smaller transition probability of a two-photon process, we easily observe the Autler-Townes effect altering the energy levels in such FWM processes. Meanwhile, the multiplied line shapes of a FWM spectrum are investigated by varying the frequency detuning. By applying external field, such FWM processes can be manipulated through modulating the dark state. Finally, conversion efficiency is considered by changing the temperature of oven, which shows a threshold temperature point. Theoretical interpretations correspond well with the experimental data.

DOI
10.1109/jqe.2012.2231403

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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.
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We experimentally report that electromagnetically induced transparency (EIT) in the nonlinear propagation of probe beam, four-wave mixing (FWM) images and in a cascade three-level atomic systems. It is shown that by changing the frequency between pumping fields or dressing fields, respectively, the properties of the measured signals including the intensity and spatial images are affected greatly, including the electromagnetically induced transparency (EIT), Aulter-Townes splitting. By changing the laser frequency we can control the four wave signal, Moreover, the AT splitting effect due to spontaneous emission was also observed under EIT conditions..
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