Study of a four-level system in vee plus ladder configuration

OPTICS COMMUNICATIONS

卷:356

Article

Bharti, Vineet¹  Natarajan, Vasant¹ 

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

关键词: Electromagnetically induced absorption;    Four-level system;    Coherent control;   

DOI  :  10.1016/j.optcom.2015.08.042

来源: Elsevier

【 摘 要 】

We present the results of a theoretical study of a four-level atomic system in vee + ladder configuration using a density matrix analysis. The absorption and dispersion profiles are derived for a weak probe field and for varying strengths of the two strong control fields. For specificity, we choose energy levels of Rb-87, and present results for both stationary atoms and moving atoms in room temperature vapor. An electromagnetically induced absorption (EIA) peak with negative dispersion is observed at zero probe de-tuning when the control fields have equal strengths, which switches to electromagnetically induced transparency (ET) with positive dispersion (due to splitting of the EIA peak) when the control fields are unequal. There is significant linewidth narrowing in thermal vapor. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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