Effects of spontaneously generated coherence on resonance fluorescence in a microwave-driven four-level atomic system

2012 ◽  
Vol 285 (10-11) ◽  
pp. 2632-2637 ◽  
Author(s):  
Chun-Liang Wang ◽  
Yan-Li Meng
Keyword(s):  
Atomic System ◽  
Resonance Fluorescence ◽  
Spontaneously Generated Coherence

scholarly journals Two-photon resonance fluorescence of a ladder-type atomic system

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
Simone Gasparinetti ◽  
Jean-Claude Besse ◽  
Marek Pechal ◽  
Robin D. Buijs ◽  
Christopher Eichler ◽  
...  
Keyword(s):  
Atomic System ◽  
Resonance Fluorescence ◽  
Two Photon ◽  
Photon Resonance

CONTROL OF ABSORPTION AND KERR NONLINEARITY BASED ON QUANTUM COHERENCE WITHOUT DRIVING FIELD

2010 ◽  
Vol 24 (30) ◽  
pp. 2921-2930 ◽  
Author(s):  
ZHONGHUA HUANG ◽  
AIXI CHEN ◽  
ZHAOCHU CHEN ◽  
LI DENG
Keyword(s):  
Quantum Coherence ◽  
Atomic System ◽  
Electromagnetically Induced Transparency ◽  
Kerr Nonlinearity ◽  
Linear Absorption ◽  
Driving Field ◽  
Spontaneously Generated Coherence ◽  
Traditional Scheme ◽  
Atomic Medium ◽  
Induced Transparency

In a three-level atomic system, the influences of spontaneously generated coherence on the linear absorption and the Kerr nonlinearity are investigated. Our studies show that properties of linear absorption can be dramatically affected by the effect of spontaneously generated coherence. With increase of intensities of spontaneously generated coherence, absorption inhibition will occur, and finally the atomic medium becomes transparent. Furthermore, we find that the Kerr nonlinearity can be obviously enhanced under the action of effects of spontaneously generated coherence. Comparing with traditional scheme of the electromagnetically induced transparency, absorption and Kerr nonlinearity can be controlled without need another driving field in our scheme.

Left-Handed Material in Five-Level System Based on the Effect of Spontaneously Generated Coherence

2013 ◽  
Vol 816-817 ◽  
pp. 242-245
Author(s):  
Xiang An Yan ◽  
Li Qiang Wang
Keyword(s):  
Refractive Index ◽  
Density Matrix ◽  
Quantum Coherence ◽  
Atomic System ◽  
Negative Refractive Index ◽  
Matrix Approach ◽  
Level System ◽  
Spontaneously Generated Coherence ◽  
Left Handedness ◽  
Left Handed

We propose a scheme for realizing negative refractive index in a multilevel atomic system. The theoretical modeling has been done using density matrix approach in which the spontaneously generated coherence (SGC) is also induced. It is shown that the negative refractive index can be obtained on the effect of quantum coherence. The parameters () quantifying left-handedness in the system become more negative if the SGC is defined in the appropriate value. Furthermore, left-handed material with reduced absorption is possible by choosing appropriate parameters.

scholarly journals The Kerr Nonlinearity in an N-Type Four-Level System via Spontaneously Generated Coherence

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
Yingjie Du ◽  
Kang Jin ◽  
Junxiang Zhang
Keyword(s):  
Atomic System ◽  
Kerr Nonlinearity ◽  
Level System ◽  
Probe Field ◽  
Spontaneously Generated Coherence

The Kerr nonlinearity is investigated in an N-type four-level atomic system whose both supper levels are degenerated or nearly degenerate. It is found that the spontaneously generated coherence as a result of the degenerate levels can change the Kerr nonlinearity dramatically depending on the angle between two spontaneous channels. In addition, we discover that the probe field makes its own contribution to the nonlinearity in comparison to indifference in general three-level systems.

Bistable behaviors of weak probe light via coherent and incoherent fields

2015 ◽  
Vol 93 (10) ◽  
pp. 1106-1111 ◽  
Author(s):  
H. Jafarzadeh ◽  
E. Ahmadi Sangachin ◽  
Seyyed Hossein Asadpour
Keyword(s):  
Optical Bistability ◽  
Light Propagation ◽  
Atomic System ◽  
Ring Cavity ◽  
Group Index ◽  
Probe Light ◽  
Spontaneously Generated Coherence ◽  
Intensity Threshold ◽  
Atomic Medium ◽  
Incoherent Pumping Field

In this paper, the bistable behaviors of weak probe light in a unidirectional ring cavity with a four-level atomic system are discussed. We find that in the presence of spontaneously generated coherence (SGC), the medium is completely phase dependent and the intensity threshold of optical bistability can be controlled. The effect of an incoherent pumping field on optical bistability in the presence and absence of SGC is also analyzed. Moreover, the group index behavior of weak probe light is investigated. We show that the intensity threshold of optical bistability can be controlled by light propagation switching from slow to fast by different parameters of the atomic medium.

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