中国物理B ›› 2012, Vol. 21 ›› Issue (5): 54209-054209.doi: 10.1088/1674-1056/21/5/054209
张晓航1,鲍倩倩1,张岩1,苏铭彻2,崔淬砺1,吴金辉1
Zhang Xiao-Hang(张晓航)a), Bao Qian-Qian(鲍倩倩) a), Zhang Yan(张岩)a), Su Ming-Che(苏铭彻)b), Cui Cui-Li(崔淬砺) a)†, and Wu Jin-Hui(吴金辉)a)
摘要: We propose an efficient scheme for optimizing the optical memory of a sequence of signal light pulses in a system of ultracold atoms in Λ configuration. The memory procedure consists of write-in, storage, and retrieval phases. By applying a weak microwave field in the storage stage, additional phase-dependent terms are included, and the contrast of the output signal pulses can be dynamically controlled (enhanced or suppressed) through manipulating the relative phase φ between optical and microwave fields. Our numerical analysis shows that the contrast is enhanced to the most extent when φ=1.5π. In addition, the contrast is in proportion to the Rabi frequency of the microwave field with a certain relative phase.
中图分类号: (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)