Efficient Optical Storage with Electromagnetically Induced Transparency in Cold Atoms

Shengwang Du, Liu, Chang, M. M. T. Loy +4 more

Shanchao Zhang, Shuyu Zhou, Chang Liu +5 more

Shengwang Du

Shanchao Zhang, Shuyu Zhou, M. M. T. Loy +2 more

We experimentally investigate optical storage with electromagnetically induced transparency in a dense cold (85)Rb atomic ensemble. By varying the optical depth (OD) from 0 to 140, we observe that the optimal storage efficiency has a saturation value of 50% as OD>50. Our result is consistent with that obtained from hot vapor cell experiments.

Zhang Zhi-yin

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.

Hai Wang

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.