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The European Physical Journal B

Steady-state populations of a driven three-level atom in a broad-band squeezed vacuum

Z.-C. Wang, Zhen-Qi Chen, Ying Xu

Published Aug 1, 1998• 3 citations
Publisher
DOI
10.1007/s100510050368

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Steady state Behaviour of a Three level Ladder Atomic System with Incoherent Population Pumping in a Squeezed Vacuum

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A study is made of the steady state populations of a three level ladder atom in a squeezed vacuum, driven by a superposition of a monochromatic laser wave with incoherent population pumping. Using the density matrix equations for the system, the steady state populations are calculated numerically and shown graphically as functions of two photon detuning for various cases of the squeezed vacuum and different incoherent pump rates. It is shown that the incoherent population pumping tends to greatly decrease the two photon absorption from the squeezed vacuum.

中国激光(英文版)•Jan 1, 1999•0 citations
This paper mainly deals with the steady-state population of a moving ladder-type three-level atom,driven by a superposition of a monochromatic laser wave with a broad-band squeezed vacuum,From the Hamiltonian of the atomic system,making use of Born-Markoff approximation,we derive the master equation for the system and the atomic Bloch equations and obtain the steady-state solutions of the optical Bloch equations using numerical calculation.Then we discuss the dependence of the attained population σ_(ii) on parameters such as detuning Δ,Rabi frequencies e_1e_2,phase ,squeezing photon number N and spontaneous decay ratesγ_1 γ_2 etc in different cases by using graphical method.
This paper mainly studies the radiation pressure of a moving ladder-type three-level atom driven by a superposition of a bichromatic laser wave with a broad-band squeezed vaccum and obtains the steady-state expression for the radiation force.Frist,from the master equations for a moving ladder-type three-level atom driven by a superposition of a bichromatic laser wave with a broad-band squeezed vaccum,we derive the equations for the atomic density matrix element.Second,by choosing proper scaled variables,Bloch equations for the atomic population are obtained.Then,from Heisenberg equation for atomic momentum,considering the adiabatic approximation,the mathematical expression of the mean radiation pressure is obtained.At last,by considering the steady-state case in which the atomic population doesn't vary with time and the condition,the steady-state expression of the radiation pressure is obtained.
A study is made of the steady state populations of a three level ladder atom in a squeezed vacuum, driven by a superposition of a monochromatic laser wave with incoherent population pumping. Using the density matrix equations for the system, the steady state populations are calculated numerically and shown graphically as functions of two photon detuning for various cases of the squeezed vacuum and different incoherent pump rates. It is shown that the incoherent population pumping tends to greatly decrease the two photon absorption from the squeezed vacuum.