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Egyptian Journal of Pure and Applied Science

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)

Published Jul 1, 2015• 0 citations
Publisher

Abstract

We study the polarization properties theoretically in a Doppler broadened N-type four-level atomic system under the effect of a strong-probe field.We calculate the polarization coherence of a system at exact analytical solution.The coherent holes are observed and controlled by adjusting the parameters of spontaneously generated coherence (SGC), transverse fields, the Doppler width and coherent coupling fields as well as the nonradiative decay rates.The three-dimension of the spectra are plotted to observe the coherent holes clearly when the probe polarization spectrum depends explicitly on the nonradiative decay rates.

DOI
10.21608/ejaps.2015.184783

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We study the polarization properties theoretically in a Doppler broadened N-type four-level atomic system under the effect of a strong-probe field.We calculate the polarization coherence of a system at exact analytical solution.The coherent holes are observed and controlled by adjusting the parameters of spontaneously generated coherence (SGC), transverse fields, the Doppler width and coherent coupling fields as well as the nonradiative decay rates.The three-dimension of the spectra are plotted to observe the coherent holes clearly when the probe polarization spectrum depends explicitly on the nonradiative decay rates.
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We have studied the effect of the spontaneously generated coherence (SGC) on gain of lasing without inversion (LWI) in a closed three-level Λ-type atomic system with Doppler broadening. It is shown that, regardless of the driving and probe fields being co- or counter-propagating, at a suitable value of the Doppler width, we can obtain a much larger LWI gain with SGC than that without SGC; and the region of the LWI gain spectrum with SGC is obviously larger than that without SGC. When the Doppler width takes a constant value, the gain does not monotonically decrease or increase with increasing strength of SGC, the largest LWI gain can be obtained by adjusting strength of SGC. Generally speaking, the co-propagating probe and driving fields is favourable to obtain a larger LWI gain.
The coherence of a four-level Λ-type system with spontaneously generated coherence(SGC) is studied.With a weak probe and a strong coupling fields,whether the atomic system is on two-photon resonance or not,there is light without population inversion(LWI) on the probe field.On two-photon resonance,LWI is strengthened by SGC.On non-two-photon resonance,LWI can be controlled simply by adjusting the parameter of SGC and the two-upper-level separation.Meanwhile,the analytical solutions to the SGC parameter where LWI occurs are given in both cases.
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It is shown that in a Doppler broadened open N-type four-level atomic system with spontaneously generated coherence (SGC), the gain without inversion (GWI) is very sensitive to the variation of the relative phase between the probe field and the driving field; the atomic exit rate ( R 0 ) and the ratio ( S ) of the atomic injection rates have a considerable modulation effect on the phase-dependent GWI. GWI first increases and then decreases with Ro increasing; in a certain value range of S , GWI increases monotonically with S increasing; by adjusting the values of R 0 and S , in an open system a much larger GWI can be obtained than in the corresponding closed system [ 2011 Phys. Rev. A 83 043805 ]. The modulation effects of R 0 and S on the phase-dependent GWI in the case with the counter-propagating probe and driving fields are stronger than those in the co-propagating case, GWI in the co-propagating case is much larger than that in the counter-propagating case.
In this paper we study influences of Doppler broadening, spontaneously generated coherence, and other system parameters on propagation effect in a quasi lambda-type four-level atomic system. It is shown that when the Doppler broadening is present, generally speaking, the values of gain and intensity of lasing without inversion (i.e. the probe field) in the co-propagating probe and driving fields case are much larger than those in the counter-propagating case; considerably larger gain and intensity of lasing without inversion than those without the Doppler broadening can be obtained by choosing appropriate values of the Doppler broadening width and spontaneously generated coherence strength. The gain and intensity of lasing without inversion increase with the increase of spontaneously generated coherence strength; when spontaneously generated coherence is present, much larger gain and intensity of lasing without inversion than those in the case without spontaneously generated coherence can be obtained. Choosing suitable values of the probe detuning, Rabi frequencies of the driving and pump fields at the entrance of the medium also can remarkably enhance the gain and intensity of lasing without inversion.