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Acta Sinica Quantum Optica

Experimental Investigation of Optical Storage and Release in EIT Medium of ~(87)Rb Cold Atom

Hai Wang

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

Optical storage and release is achieved by using electromagnetically induced transparency(EIT) dynamics in cooled 87Rb atoms medium.The collapses and revivals of the released signal caused by Larmor precession is studied in the experiment.The results show the measured Larmor periods are in agreement with theoretical predictions when the provided magnetic field along quantization axis is over 100 mG,which provide the experimental foundation for quantum storage research in the future.

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Optical storage and release is achieved by using electromagnetically induced transparency(EIT) dynamics in cooled 87Rb atoms medium.The collapses and revivals of the released signal caused by Larmor precession is studied in the experiment.The results show the measured Larmor periods are in agreement with theoretical predictions when the provided magnetic field along quantization axis is over 100 mG,which provide the experimental foundation for quantum storage research in the future.
By using electromagnetically induced transparency(EIT),we realized the optical signal storage and release in 87 Rb cold atom medium.We have got the curve of storage efficiency as a function of the repumping intensity in cooling system.Experimental results showed that:the storage efficiency increases with the repumping intensity,when it increases from zero;if the repumping intensity exceeds a certain intensity,the storage efficiency begins to decrease.A simple analysis interpreted the relationship between storage efficiency and the repumping intensity.
By using electromagnetically induced transparency(EIT) dynamics,we realized the storage and release of optical signals in 87Rb cold atoms,studied the relationship between the storage efficiency and the coupling intensity.Experimental results show that the storage efficiency increases with the coupling intensity in the situation of low coupling intensity.When the coupling beam exceeds certain intensity,the storage efficiency doesn′t increase any more.Then it runs down with the rise of coupling intensity.By analyzing the absorption and dispersion characteristics of light pulse propagating through cold atoms,we made a qualitative explanation of the changing trend of the storage efficiency with the coupling intensity changing.
We experimentally measured the relative contrast of an electromagnetically-induced transparency (EIT) spectrum with two cw lasers in a Λ-type system of magneto-optically trapped 87 Rb atoms, which is a perturbed cold atomic medium. The contrast depends nonlinearly on the power of the coupling beam. Experimental results showed good agreement qualitatively with the simulation results considering the trapping magnetic field gradient, which induced detuning of the coupling laser. We used a free expanding cold atomic cloud that had a temperature of (36 ± 1) µK. To observe the EIT spectrum in the non-perturbed medium, we used two pulsed lasers. We observed that the relative contrast in the unperturbed medium was three times higher than that in the perturbed medium under our experimental conditions.
We report the experimental investigation of electromagnetically induced transparency（EIT） in a Zeeman-sublevelsΛ-type system of cold 87Rb atoms in free space. We use the Zeeman substates of the hyperfine energy states 52S1/2, F = 2 and 52P3/2, F = 2 of 87Rb D2 line to form a Λ-type EIT scheme. The EIT signal is obtained by scanning the probe light over 1 MHz in 4 ms with an 80 MHz arbitrary waveform generator. More than 97% transparency and 100 k Hz EIT window are observed. This EIT scheme is suited for an application of pulsed coherent storage atom clock（Yan B, et al. 2009 Phys.Rev. A 79 063820）.
We report the experimental investigation of electromagnetically induced transparency (EIT) in a Zeeman-sublevels Λ -type system of cold 87 Rb atoms in free space. We use the Zeeman substates of the hyperfine energy states 5 2 S 1/2 , F = 2 and 5 2 P 3/2 , F ' = 2 of 87 Rb D 2 line to form a Λ -type EIT scheme. The EIT signal is obtained by scanning the probe light over 1 MHz in 4 ms with an 80 MHz arbitrary waveform generator. More than 97% transparency and 100 kHz EIT window are observed. This EIT scheme is suited for an application of pulsed coherent storage atom clock (Yan B, et al. 2009 Phys. Rev. A 79 063820).