The linewidth and contrast of electromagnetically induced transparency in a homogeneously broadened system

Yang, Lei; Zhang, Lianshui; Guo, Qi; Fu, Guangsheng

doi:10.1016/j.jlumin.2006.01.222

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…4 and 5 correspond to ATD type situation. The EIT width is proportional to Ω i 2 [11] in this situation and consequently the EIT width will go up as the number of windows increases along with the increase in the depth of the EIT dip. This is clear from the comparison of Figs.…”

Section: Resultsmentioning

confidence: 99%

Double electromagnetically induced transparency with nuclei inside a cavity

Joshi

Serna

2015

Optics Communications

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Section: Resultsmentioning

confidence: 99%

Double electromagnetically induced transparency with nuclei inside a cavity

Joshi

Serna

2015

Optics Communications

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“…К недостаткам -системы следует отнести существенное уширение конечного уровня (в нашем случае 5D) в случае больших плотностей атомов основного или буферного газа [26], в то время как в -системе наличие буферного газа практически не уширяет нижние уровни, а увеличение пролетного времени атома через лазерные пучки позволяет формировать DR с шириной в несколько Hz [11]. В формуле (1) предполагается, что частота Раби для связывающего излучения C меньше естественных ширин атомных уровней, в случае же больших величин γ DR ∼ c [24] хорошо согласуется с кривой на рис. 6, b. Зависимость γ DR от плотности атомарных паров N −1/2 хорошо согласуется при толщинах столба паров L ∼ 1 cm, однако при малых толщинах в несколько микрометров зависимость значительно слабее, а в случае малых толщин L < λ вместо спектрального сужения DR имеет место уширение спектра.…”

Section: Discussionunclassified

“…Поскольку частотa Раби C ∼ P 0.5 , то имеем зависимость для ширины γ DR ∼ C . На линейную зависимость ширины γ DR от частоты Раби указано в работе [24].…”

Section: толщина столба паров L = 25 λ = 1950 Nmunclassified

Конкуренция Концентрационного Сужения И Полевого Уширения Темного Резонанса В Лестничной Системе Уровней Атомов Рубидия: Особенности Проявления В Тонких Спектроскопических Ячейках

Саргсян¹,

Adams

Вартанян³

et al. 2020

Журнал Технической Физики

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The effect of electromagnetically-induced transparency in the ladder system of 5S1/2-5P3/2-5D5/2 levels of Rb atoms is studied. The effect of spectral narrowing of the dark resonance (DR) is shown depending on the density of atomic vapor and the thickness L of the spectroscopic cell, which contains Rb atomic vapor. The thickness L varies from 390 nm to 4 mm, the atomic density N increased to ~ 10^16 cm^-3, and intense coupling and weak probe radiation were used. The maximum effect, namely the 22-fold spectral narrowing of DR, was achieved in a cell with a thickness of L = 4 mm. With decreasing of the thickness L, the effect of spectral narrowing becomes weaker: for example, at L = 2 μm, a 2.4-fold spectral narrowing of DR occurs. The spectral narrowing of DR was practically absent at L = 0.8 μm, and with a further decrease to L = 0.4 μm with increasing of atomic vapor density, spectral broadening of DR began to occur. In almost all cases, at moderate atomic densities and high intensities of the coupling radiation, ~ 100% DR contrast was achieved. The effect of spectral narrowing and broadening of DR is explained.

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“…In a type three-level system with two ground state hyperfine levels, each coupled by a coherent light field to a common excited level as shown in Fig.1(a), the spectral width of the transparency window can be many orders of magnitude narrower than that given by inverse lifetime of the excited state |3> as the EIT resonance is associated with the atomic coherence between the ground state hyperfine levels. The narrow spectral width is of great interest for potential applications such as slow light and quantum information processing [3] and hence has been a subject of many recent studies where the power broadening effect of EIT resonance has been investigated as a functions of various parameters [4][5][6][7][8][9] . It is known that as the coupling laser intensity increases there is a power broadening of the EIT resonance and recently, it has been shown that [10,11] the spectral feature with sub-natural width can be recovered in an EIT system by introducing detuning between the coupling field and the atomic transition.…”

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confidence: 99%

Spectral line narrowing effect induced by atomic coherence in a three-level Λ system

Zhang

Yang

et al. 2007

Optoelectron. Lett.

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We present the spectral line narrowing effect in a three-level atomic system where one transition is coupled by a coupling laser and the narrow feature is observed by probing the other transition with a weak laser. As coupling laser detuning increases the electromagnetically induced transparency resonance is observed to evolve into electromagnetically induced absorption resonance with sub-natural linewidth. The linewidth of the narrow spectral feature is studied as a function of coupling laser detuning and the atomic system parameters. The result is explained using density matrix density equation in the dressed-atom picture.Atomic coherence and quantum interference effects have been extensively studied in recent years and in particular electromagnetically induced transparency (EIT) [1,2] has attracted considerable attention due to its sub-natural width. In a type three-level system with two ground state hyperfine levels, each coupled by a coherent light field to a common excited level as shown in Fig.1(a), the spectral width of the transparency window can be many orders of magnitude narrower than that given by inverse lifetime of the excited state |3> as the EIT resonance is associated with the atomic coherence between the ground state hyperfine levels. The narrow spectral width is of great interest for potential applications such as slow light and quantum information processing [3] and hence has been a subject of many recent studies where the power broadening effect of EIT resonance has been investigated as a functions of various parameters [4][5][6][7][8][9] . It is known that as the coupling laser intensity increases there is a power broadening of the EIT resonance and recently, it has been shown that [10,11] the spectral feature with sub-natural width can be recovered in an EIT system by introducing detuning between the coupling field and the atomic transition. It is also worth noticing that the narrow spectral feature is of absorptive profile. In most practical systems EIT are often observed at situations where the coupling laser intensity is considerably larger than the power broadening threshold, and these interesting results imply a new way to obtain narrow spectral feature even at high coupling laser intensity. system or inhomogeneous broadening in solid states system. This is a logic approach as in most experiments uhere Doppler broadening is present. To our best knowledge, there has not been reported study for an ideal three level system and such a study should lead to a better understanding of the atomic coherence and this is the topic covered in this paper.In this paper, we present a theoretical study of absorption feature with sub-natural line width in an idea type threelevel atomic system. The narrow absorptive spectral feature is studied numerically by solving the density matrix equations of motion in bared state basis of a three-level system interacting with a coupling and a probe field in a configuration. The density matrix equations of motion in dressed-atom basis is then derived to give an int...

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The linewidth and contrast of electromagnetically induced transparency in a homogeneously broadened system

Cited by 8 publications

References 22 publications

Double electromagnetically induced transparency with nuclei inside a cavity

Double electromagnetically induced transparency with nuclei inside a cavity

Spectral line narrowing effect induced by atomic coherence in a three-level Λ system

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