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Fluorescence from doubly driven four-level atoms

A density matrix approach

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Abstract.

The unusually narrow features in the fluorescence from 85Rb driven by two laser fields L1 and L2, reported in [1], are explained on the basis of a four-level density matrix calculation. The L2 laser enables atom transfer to the fluorescing levels connected by the strong L1 laser. In turn the L1 laser causes the Autler-Townes splitting of the upper levels connected by L2 laser. These two effects are shown to maximise fluorescence within a narrow spectral range of the scanned L2 laser due to velocity selection of atoms from co-propagating and counter propagating L1 and L2 lasers. The analysis reveals the existence of narrow spectral features from a collection of atoms at room temperature even in the absence of induced coherences between the levels.

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Authors and Affiliations

  1. Raman Research Institute, 560 080, Sadashivnagar, Bangalore, India

    A. Narayanan, R. Srinivasan, U. K. Khan, A. Vudayagiri & H. Ramachandran

Authors
  1. A. Narayanan
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  2. R. Srinivasan
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  3. U. K. Khan
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  4. A. Vudayagiri
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  5. H. Ramachandran
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Corresponding author

Correspondence to A. Narayanan.

Additional information

Received: 2 July 2004, Published online: 21 September 2004

PACS:

42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift - 32.80.Bx Level crossing and optical pumping

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Narayanan, A., Srinivasan, R., Khan, U.K. et al. Fluorescence from doubly driven four-level atoms. Eur. Phys. J. D 31, 107–112 (2004). https://doi.org/10.1140/epjd/e2004-00123-2

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  • DOI: https://doi.org/10.1140/epjd/e2004-00123-2

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