Mr. Jian Wang Profile

Jian Wang

at Hebei Univ

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Proceedings Article | 20 March 2009 Paper

Optical switching property of electromagnetically induced transparency in a lambda system

Jian Wang, Min Zhao, Lianshui Zhang, Lijun Yang, Xiaoli Li, Xiaomin Feng

Proceedings Volume 7125, 712514 (2009) https://doi.org/10.1117/12.824653

KEYWORDS: Optical switching, Absorption, Transparency, Switching, Chemical species, Quantum optics, Quantum information, Nonlinear optics, Data storage

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In this paper we study the coherent transient property of a Λ-three-level system (Ω_d = 0) and a quasi- Λ -four-level system (Ω_d>0). Optical switching of the probe field can be achieved by applying a pulsed coupling field or rf field. In Λ -shaped three-level system, when the coupling field was switched on, there is a almost total transparency of the probe field and the time required for the absorption changing from 90% to 10% of the maximum absorption is 2.9_Γ0 (_Γ0 is spontaneous emission lifetime). When the coupling field was switched off, there is an initial increase of the probe field absorption and then gradually evolves to the maximum of absorption of the two-level absorption, the time required for the absorption of the system changing from 10% to 90% is 4.2_Γ0. In four-level system, where rf driving field is used as switching field, to achieve the same depth of the optical switching, the time of the optical switching is 2.5_Γ0 and 6.1_Γ0, respectively. The results show that with the same depth of the optical switching, the switch-on time of the four-level system is shorter than that of the three-level system, while the switch-off time of the four-level system is longer. The depth of the optical switching of the four-level system was much larger than that of the three-level system, where the depth of the optical switching of the latter is merely 14.8% of that of the former. The speed of optical switching of the two systems can be increased by the increase of Rabi frequency of coupling field or rf field.

Proceedings Article | 20 March 2009 Paper

Optical switching property of electromagnetically induced transparency in a lambda system

Jian Wang, Min Zhao, Lianshui Zhang, Lijun Yang, Xiaoli Li, Xiaomin Feng

Proceedings Volume 7125, 712514 (2009) https://doi.org/10.1117/12.824653

KEYWORDS: Optical switching, Absorption, Transparency, Switching, Chemical species, Quantum optics, Quantum information, Nonlinear optics, Data storage

Read Abstract +

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