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

Dipankar Bhattacharyya, Arindam Ghosh, Amitava Bandyopadhyay, Satyajit Saha, Sankar De


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.


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

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G. Alzetta et al., Nuovo Cimento B,36 (1976), 5.

K. J. Boller, A. Imamoglu and S. E. Harris, Phys. Rev. Lett.,66 (1991), 2593.

S. E. Harris, Phys. Today, 50 (1997), 36.

J. G. Banacloche, Y-Q Li, S-Z Jin and Xiao, Phys. Rev. A, 51 (1995), 576.

D. Bhattacharyya, B. K. Dutta, B. Ray, and P. N. Ghosh, Chem. Phys. Lett.,389(2004),113.

D. Bhattacharyya, B. Ray and P. N. Ghosh, Phys. B: At Mol. Opt. Phys.,40 (2007),4061.

D. A. Smith and I. G. Hughes, Am. J. Phys,72 (2004),631.

H. J. Metcalf and P. van der Straten, Laser Cooling and Trapping (Berlin: Springer),1999.

Y. Rostovtsev, I. Protsenko, H. Lee and A. Javan, J. Mod. Opt., 49 (2002) 2501.

M. V. Pack, R. M. Camacho and J. C. Howell, Phys. Rev. A, 76 (2007) 013801.

S. Stenholm, “Foundations of Laser Spectroscopy” (John Willey, New York) 1983

M. O. Scully and M. S. Zubairy, “Quantum Optics” Cambridge University Press London 1997.



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