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Optics Express

Intensity-dependent effects on four-wave mixing based on electromagnetically induced transparency

Gang Wang, Lin Cen, Yi Qu, Yan Xue, Jin‐Hui Wu, Jin-Yue Gao

Published Oct 18, 2011• 8 citations
Publisher

Abstract

We extend the study on a four-wave mixing (FWM) scheme of contiuous-wave lasers in a hot rubidium vapor when the probe and coupling fields work in the electromagnetically induced transparency (EIT) regime while the pump and signal fields work in the two-photon Raman regime. Our experimental results show that the generated signal field is well contained in an EIT dip of the incident probe field as a result of efficient FWM. We find, in particular, that an optimal FWM process can only be attained when the coupling and pump fields are well matched in intensity. If the probe intensity is far beyond the EIT condition, however, the nonlinear efficiency of energy transfer from the probe field to the signal field will be greatly reduced.

DOI
10.1364/oe.19.021614

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We extend the study on a four-wave mixing (FWM) scheme of contiuous-wave lasers in a hot rubidium vapor when the probe and coupling fields work in the electromagnetically induced transparency (EIT) regime while the pump and signal fields work in the two-photon Raman regime. Our experimental results show that the generated signal field is well contained in an EIT dip of the incident probe field as a result of efficient FWM. We find, in particular, that an optimal FWM process can only be attained when the coupling and pump fields are well matched in intensity. If the probe intensity is far beyond the EIT condition, however, the nonlinear efficiency of energy transfer from the probe field to the signal field will be greatly reduced.
We experimentally and theoretically analyze the propagation of weak-signal field pulses under the conditions of electromagnetically induced transparency (EIT) in hot Rb vapor, and study the effects of resonant four-wave mixing (FWM). In particular, we demonstrate that in a double-Λ system, formed by the strong control field with the weak resonant signal and a far-detuned Stokes field, both continuous-wave spectra and pulse propagation dynamics for the signal field depend strongly on the amplitude of the seeded Stokes field, and the effect is enhanced in optically dense atomic medium. We also show that the theory describing the coupled propagation of the signal and Stokes fields is in good agreement with the experimental observations.
In this paper we report an observation of the two-photon absorption in a four-level system in hot 87Rb^{87}\mathrm{Rb}87Rb vapor based on the proposal of Harris and Yamamoto [Phys. Rev. Lett. 81, 3611 (1998)]. We show that this effect is reduced in hot atoms due to the non-Doppler-free nature of this scheme. Then we report a phenomenon that could be used in the same application of Harris and Yamamoto. The main result is a great enhancement of electromagnetically induced transparency (EIT) effect in hot 87Rb^{87}\mathrm{Rb}87Rb vapor caused by optical pumping. We find that when the single photon detuning is near zero the EIT signal is dramatically enhanced by an optical pumping field. More interestingly when the single photon detuning is larger the signal can be changed from a sharp Raman peak to a sharp EIT dip. The full width at half maximum of the peak and dip are narrow and subnatural.
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..
Abstract We report an experimental demonstration of efficient light storage based on a modified technique of electromagnetically induced transparency in hot rubidium vapor. By introducing an auxiliary pump field to go beyond the Λ -type configuration, we find that the undesired four-wave mixing can be greatly suppressed to result in sufficiently reduced energy loss of a probe pulse. The light storage efficiency can be as high as ∼80% within the storage time of 100 ns with the pump field applied, which is almost 6 times larger than that in the absence of the pump field. We may also amend the light storage efficiency in a linear way by increasing the optical depth of our atomic vapor even without saturation effect. We obtain, in fact, an amplified probe pulse via Raman gain during light storage and retrieval, which should have practical applications in classical and quantum information processing.