Coherent processes in electromagnetically induced absorption: a steady and transient study

Details Coherent processes in electromagnetically induced absorption: a steady and transient study Coherent processes in electromagnetically induced absorption: a steady and transient study

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13c3010d&link_type=abstract

New Journal of Physics, Volume 13, Issue 3, pp. 033010 (2011).

Physics

1

Scientific paper

A perturbation method was used to solve optical Bloch equations (OBEs) for the transition Fg=1→Fe=2, in order to describe the role of ground-level Zeeman coherences in the formation of electromagnetically induced absorption (EIA). A narrow Lorentzian peak, centered at zero value of the scanning magnetic field, appears in the analytical expression of the second-order correction of a density-matrix element for ground-level Zeeman coherences, (ρg-1, g+1)x2. Through analytical expressions for lower-order corrections of density-matrix elements, we were able to establish clear relations between the narrow Lorentzian in (ρg- 1, g+1)x2 and higher-order corrections of optical coherences, i.e. EIA. We see from analytical expressions that these two resonances have opposite signs and that EIA becomes electromagnetically induced transparency (EIT) in the limit of low efficiency of spontaneous transfer of coherences from excited-level to ground-level Zeeman sublevels. The transient behavior of EIA follows the time evolution of (ρg- 1, g+1)x2. After the coupling laser is turned on, both the Lorentzian peak in (ρg- 1, g+1)x2 and EIA reach steady state via over-damped oscillations.

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