Journal article
On the non-linear spectroscopy including saturated absorption and four-wave mixing in two and multi-level atoms: A computational study


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Publication Details
Author list: Patel M, De Jager G, Nkosi Z, Wyngaard A, Govender K
Publisher: IOP Publishing: Conference Series / Institute of Physics (IoP)
Publication year: 2017
Journal: Journal of Physics: Conference Series
Journal name: Journal of Physics: Conference Series
Volume number: 905
Start page: 1
End page: 12
Total number of pages: 12
ISSN: 1742-6588
eISSN: 1742-6596

Abstract

In this paper we report on the study of two and multi-level atoms
interacting with multiple laser beams. The semi-classical approach is
used to describe the system in which the atoms are treated quantum
mechanically via the density matrix operator, while the laser beams are
treated classically using Maxwells equations. We present results of a
two level atom interacting with single and multiple laser beams and
demonstrate Rabi oscillations between the levels. The effects of laser
modulation on the dynamics of the atom (atomic populations and
coherences) are examined by solving the optical Bloch equations. Plots
of the density matrix elements as a function of time are presented for
various parameters such as laser intensity, detuning, modulation etc. In
addition, phase-space plots and Fourier analysis of the density matrix
elements are provided. The atomic polarization, estimated from the
coherence terms of the density matrix elements, is used in the numerical
solution of Maxwells equations to determine the behaviour of the laser
beams as they propagate through the atomic ensemble. The effects of
saturation and hole-burning are demonstrated in the case of two counter
propagating beams with one being a strong beam and the other being very
weak. The above work is extended to include four-wave mixing in four
level atoms in a diamond configuration. Two co-propagating beams of
different wavelengths drive the atoms from a ground state |1 to an
excited state |3 via an intermediate state |2. The atoms then move back
to the ground state via another intermediate state |4, resulting in the
generation of two additional correlated photon beams. The
characteristics of these additional photons are studied.


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Last updated on 2018-29-06 at 14:53