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Effect of Doppler broadening on VIC-dependent two-photon absorption in Y-type four-level system

Jia Ke-Ning Liu Zhong-Bo Liang Ying Tong Dian-Min Fan Xi-Jun

Effect of Doppler broadening on VIC-dependent two-photon absorption in Y-type four-level system

Jia Ke-Ning, Liu Zhong-Bo, Liang Ying, Tong Dian-Min, Fan Xi-Jun
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  • Received Date:  03 June 2011
  • Accepted Date:  26 June 2011
  • Published Online:  05 March 2012

Effect of Doppler broadening on VIC-dependent two-photon absorption in Y-type four-level system

    Corresponding author: Fan Xi-Jun, xjfan108@yahoo.com.cn
  • 1. College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;
  • 2. School of Physics, Shandong University, Jinan 250100, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 10875072).

Abstract: Using the numerical result, the influence of the Doppler broadening on the two-photon absorption related to vacuum induced coherence is discussed. In the absence of Doppler broadening, when VIC is absent, the absorption curve has a double-peak structure and the electromagnetically induced transparency phenomenon can occur; when VIC is present, the absorption curve has a single-peak structure and EIT phenomenon does not appear. In the presence of Doppler broadening, regardless of VIC being present or not, EIT phenomenon always can occur; when VIC is absent, no matter whether the propagation directions of the probe and driving fields are the same or opposite, with the Doppler broadening width (D) increasing, the absorption first increases and then decreases and the absorption curve changes gradually from a double-peak structure to a single-peak structure; when VIC is present, if propagation directions of the probe and driving fields are the same, with the value of D increasing, the absorption first increases and then decreases and the absorption curve changes gradually from a single-peak structure to a double-peak structure; if propagation directions of the probe and driving fields are opposite, with the value of D increasing, the absorption decreases monotonieally and the absorption curve remains a single-peak structure.

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