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Acta Sinica Quantum Optica

The Relationship between Light Storage Efficiency and Repumping Intensity in Cold Atom Medium

Zhang Zhi-yin

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

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.

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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.
A four-level N-type cold atomic system is proposed for optimizing images storage based on the electromagnetically induced transparency (EIT). Both analytical analysis and numerical simulation clearly show that the application, during the storage time, of an additional intensity-modulated signal field and an additional microwave field can impose an intensity and a phase-dependent factors on the atomic spin coherence in a controlled manner, then the amplitude of the retrieved images can be increased or decreased with an enhancement in the visibility. Our results are very promising for the realization of all-optical information processing of images coherently stored in EIT media in the future.