Controllability of Electromagnetically Induced Transparency in a Doppler Broadened Four-Level Atomic System

Abstract

The influence of Doppler broadening on a four-level N-type atomic system has been investigated in the presence of spontaneous generating coherence. The atomic system interacting with three electromagnetic fields and includes the nonradiative decay, the effect of co- and counter-propagation of the fields is considered. The probe susceptibility behaviors can be modified by Doppler broadening via nonperturbative treatments of the density matrix elements solution in the absence and presence of the spontaneous generating coherence. Some interesting features are enhanced for the spectral behaviors and controllability of electromagnetically induced transparency, which were found to be in good agreement to some experimental results without including Zeeman sublevels to the system.

The effect of a strong-probe field and transverse fields on the polarization properties of a four-level Doppler-broadened system with Spontaneously Generated Coherence (SGC)

“…When the perturbing laser copropagates with the probe laser, there are six (CHB) and two (EIT) that can be observed in a Doppler-broadened four level N-type atomic system by adjusting the perturbing Rabi frequency or the saturating detuning [30] . In previous reports [31][32][33] , we presented the Doppler broadened of the imaginary part of the susceptibility of probe field which represent the absorption spectrum for the four-level N-type atomic system, we displayed a number of effects for the spectra behavior, the appearance of zero absorption points, controllability of EIT and EIA and also the spectral holes can be enhanced strongly by means of the transverse dependence of the electromagnetic fields in a Doppler broadened medium and presence of SGC. All the results are observed without including numerous hyperfine levels and Zeeman sublevels to the atomic system.…”

Spectral characteristics of a modified inverted-Y system beyond rotating wave approximation

“…Two promising four-level atomic systems, i.e. inverted-Y [13][14][15][16][17][18] and N configuration [19][20][21][22][23][24][25][26], have already been earmarked for their application in non-linear spectroscopy for producing large Kerr non-linearities in an optical medium [27,28]. These third order non-linear effects relies on large field strengths to obtain considerably enhanced third order optical susceptibility.…”