Comparison of Electromagnetically Induced Transparency (EIT) Spectra for Six-level Lambda \((\Lambda)\) and Five-level V-type Systems

Authors

  • Dipankar Bhattacharyya Department of Physics, Santipur College, Santipur, West Bengal 741404
  • Arindam Ghosh Department of Physics, Visva-Bharati, Santiniketan, West Bengal 731235
  • Amitava Bandyopadhyay Department of Physics, Visva-Bharati, Santiniketan, West Bengal 731235
  • Satyajit Saha Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, West Bengal 700064
  • Sankar De Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, West Bengal 700064

DOI:

https://doi.org/10.26713/jamcnp.v2i2.323

Keywords:

42.50.Gy, 32.80.Bx, 32.70.-n

Abstract

Electromagnetically induced transparency (EIT) is experimentally studied in a rubidium vapour cell (without buffer gas, both \(^{87}\)Rb and \(^{85}\)Rb present according to their natural abundance) kept within two-layers of \(\mu(\mu)\)-metal shields to avoid the effect of Earth's magnetic field on the energy levels of atomic rubidium. An external cavity diode laser (ECDL), used as a low power probe laser, is locked to the hyperfine cross-over peak of \(F = 2 \rightarrow  F' = 2, 3\) transitions of \(^{87}\)Rb. The frequency of another ECDL, the pump laser, is set to scan the \(F=1 \rightarrow  F' = 0, 1, 2\) transitions of \(^{87}\)Rb. These form the  \(\Lambda\)-type six level system. In the V-type system, both the pump and the probe lasers share the same \(F = 2\) ground level. The probe beam coming out of the cell is detected by a low noise fast photodetector. The resulting spectra show signature of EIT in the "peak" for the  \(\Lambda\)-type system and in the "dip" for the V-type system. Numerical calculation based simulated spectra are also compared with the experimental spectra. In both the cases very narrow EIT linewidth \((\Gamma_{t} < \Gamma)\) is observed even at high value of pump Rabi-frequency \((\Omega_{c}\gg \Gamma)\). Narrower value of EIT linewidth is due to Doppler averaging phenomena.

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Published

2015-11-30
CITATION

How to Cite

Bhattacharyya, D., Ghosh, A., Bandyopadhyay, A., Saha, S., & De, S. (2015). Comparison of Electromagnetically Induced Transparency (EIT) Spectra for Six-level Lambda \((\Lambda)\) and Five-level V-type Systems. Journal of Atomic, Molecular, Condensed Matter and Nano Physics, 2(2), 93–99. https://doi.org/10.26713/jamcnp.v2i2.323

Issue

Vol. 2 No. 2 (2015)

Section

Research Article

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