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Optics Communications

High refractive index and lasing without inversion in an open four-level atomic system

Hamid Reza Hamedi, Gediminas Juzeliūnas, Ali Raheli, Mostafa Sahrai

Published Jan 1, 2013• 19 citations
Publisher
DOI
10.1016/j.optcom.2013.08.074

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The model of an open four-level atomic system is presented on the basis of the closed four-level atomic system. In the rotating wave, slowly varying envelope and mean field approximations, the density-matrix motion equations of the system are solved, and the linear analytical solution in the steady state is obtained. The numerical calculation from the steady-state solution of the open system is presented. It is shown that a change from LWI to lasing with inversion action can occur due to the Rabi frequency of the driving field increasing; another change from lasing with inversion to LWI action can also occur as the exit rate or ratio of injection rates increases; high refractive index without absorption can be obtained; the curve of ρ33-ρ11(vs Δ2) presents the shape of the rectangle wave.