Browsing by Author "Gizachew, Abebaw"

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    Degenerate Three-Level Atom Driven by Coherent Light and in a Cavity Coupled to Squeezed Vacuum Reservoir
    (Addis Ababa University, 2022-04-18) Gizachew, Abebaw; Hirpo, Deribe (PhD)
    In this thesis, we analyze the squeezing and statical properties of light produced by degenerate three-level atom in a cavity coupled to squeezed vacuum reservoir via a port-mirror. The three-level atom available in the cavity is driven by coherent light from the bottom to the top level. Employing the master equation we obtain the differential equation of the atomic and cavity mode operators. Applying the large time approximation to the time evolution of cavity mode operator and using steady-state solutions of the expectation values of cavity mode and atomic operators, we obtain the mean of the cavity photon number, power spectrum, quadrature variance and quadrature squeezing of the cavity light.We have seen that the amplitude of the coupling coherent light, the squeezing parameter, and the stimulated emission decay constant have the effect of increasing both the global and local mean photon number. Moreover, we find that the quadrature squeezing of the cavity light increases with the increase of the amplitude of the driving coherent light, the rate of the stimulation decay constant, and squeeze parameter. The squeeze parameter and the amplitude of the driving coherent light have the effect of enhancing the quadrature squeezing, with maximum squeezing of 58% for r = 0.5 and 32% for r=0.