# Dynamics of Coherently Driven Degenerate Three-Level Atom in open Cavity

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## Date

2014-04

## Authors

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## Publisher

Addis Ababa University

## Abstract

In this thesis, we study the quantum properties of the light generated by a coherently
driven degenerate three-level atom in an open cavity coupled to a vacuum reservoir. The
three-level atom available in the cavity is driven by coherent light from the bottom to
the top level. We perform our analysis by putting the noise operators associated with
the vacuum reservoir in normal order. Employing the master equation and the quantum
Langevin equation we obtain the di erential equations of the atomic and cavity-mode
operators. Using the steady-state solutions of the resulting equations, we determined the
photon statistics, quadrature squeezing and the local mean photon number. It is observed
that the mean photon number is greater when
= 0 than when
= 0:1. We nd, like
the mean photon number, the variance of the photon number to be greater for
= 0
than for
= 0:1. Moreover, we have also established that the maximum quadrature
squeezing of the light generated by the atom, to be 43.42 % for
= 0 and 42.22 % for
= 0:1 below the coherent-state level. Thus in the absence of spontaneous emission the
mean, the variance and the quadrature squeezing of the cavity light is greater than in the
presence of spontaneous emission. Finally, we have found that a large part of the total
mean photon number is con ned in a relatively small frequency interval

## Description

## Keywords

Dynamics of Coherently