Double dark resonance in inverted Y system and its application in attenuating the optical switching action

Ali, Sabir; Ray, Ayan

doi:10.1140/epjd/e2015-60533-5

Cited by 9 publications

(7 citation statements)

References 31 publications

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“…For example, a threelevel Λ-type system coupled with a simple 'V'-type system forms an 'N'-type system [21][22][23][24]. Other multilevels systems like 'M'-type [25,26], Y-type [27][28][29], inverted-Y [30][31][32][33][34] etc have also been studied by many groups. The four-level inverted-Y type system has two ground energy levels, one intermediate energy level and one upper energy level.…”

Section: Introductionmentioning

confidence: 99%

An optical narrowband switch between subluminal and superluminal light propagation in the inverted-Y configuration

Mondal¹,

Ghosh²,

Islam³

et al. 2019

Laser Phys.

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The propagation of a weak probe field through a four-level inverted-Y type atomic system driven by two additional coherent fields, namely the control field and the repump field, is studied. The simulated probe absorption shows that electromagnetically induced transparency and the line shape of the transparency window under a Doppler-broadened condition are dependent on the residual Doppler averaging due to the wavelength mismatch between the control and probe fields. For 87 Rb the probe propagation changes from subluminal on-resonance under a Doppler-free condition to superluminal on-resonance under a Dopplerbroadened condition. For both 87 Rb and 133 Cs, the narrow subluminal window occurring in the group index profile in a Doppler-free environment offers an excellent delay bandwidth for probe field propagation. Under this condition, the order of the delay in probe field propagation can be as long as a few hundred µs and seems quite promising in the field of optical delay generation and light storage. The analysis shows that the residual Doppler averaging has a greater impact on the switching window under the variation of the Rabi frequency of the control field as compared to that of the repump field.

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Section: Introductionmentioning

confidence: 99%

An optical narrowband switch between subluminal and superluminal light propagation in the inverted-Y configuration

Mondal¹,

Ghosh²,

Islam³

et al. 2019

Laser Phys.

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show abstract

“…As the strength Ω 02 of the probe field is weaker than the strength of all other coupling fields, the probe field can be neglected while evaluating the eigen dressed states corresponding to the Hamiltonian H I in equation 16. The resulting three eigen-frequencies and their corresponding eigen dressed states are…”

Section: Resultsmentioning

confidence: 99%

“…Two promising four level atomic systems, i.e. inverted Y [12][13][14][15][16][17] and N configuration [18][19][20][21][22][23][24][25], have already been earmarked for their application in non-linear spectroscopy for producing large Kerr non-linearities in an optical medium [26,27]. These third order non-linear effects relies on large field strengths to obtain considerably enhanced third order optical susceptibility.…”

Section: Introductionmentioning

confidence: 99%

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

Mishra

Chakraborty

Mishra

2019

J. Phys. B: At. Mol. Opt. Phys.

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The spectral properties of a multilevel atomic system interacting with multiple electromagnetic fields, a modified inverted-Y system, have been theoretically investigated. In this study, a numerical matrix propagation method has been employed to study the spectral characteristics beyond the validity regime of the rotating wave approximations. The studied atomic system, comprising of several basic sub-systems i.e. lambda, ladder, vee, N and inverted-Y, is useful to study the interdependence among these basic sub-systems. The key features of the obtained probe spectra as a function of coupling strength and detuning of the associated electromagnetic fields show inter-conversion, splitting and shifting of the transparency and absorption peaks. The dressed and doubly dressed state formalism have been utilized to explain the numerically obtained results. This study has application in design of novel optical devices capable of multi-channel optical communication along with switching.

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“…The ideal three-level EIT system creates a dark state which does not interact with the probe field and result in the transmission of probe. The researchers have further investigated this dark state by applying pertubation through a microwave field [22], radio-frequency field [23] and an additional coupling field [24][25][26][27][28], and in these cases a dual EIT structure has been observed. Niu [29] had earlier reported that the four-level EIT (dual structure) shows greatly enhanced non-linear effects than an ideal EIT obtained through three-level system.…”

Section: Introductionmentioning

confidence: 99%

Observation of dual electromagnetically induced transparencies in cold $^{87}Rb$ atoms

Mishra,

Chakraborty,

Ram

et al. 2019

Preprint

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We have observed two dual electromagnetically induced transparency (EIT) spectra in probe transmission through cold 87 Rb atoms trapped in a magneto-optical trap (MOT). These dual EIT peaks are generated in two different N-systems formed by probe, coupling and control beams interacting with different levels in D2 line transitions of 87 Rb atom. The dependence of spectral features of two N-systems on driving beams (i.e. coupling and control beams) strength and detuning has been investigated. The results show that the dual EIT spectral features in both the N-systems can be manipulated by varying the strength and detuning of both the driving beams. The two Nsystems have been modelled theoretically using a density matrix formalism and results have shown a reasonable agreement with the experimental observations.

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Double dark resonance in inverted Y system and its application in attenuating the optical switching action

Cited by 9 publications

References 31 publications

An optical narrowband switch between subluminal and superluminal light propagation in the inverted-Y configuration

An optical narrowband switch between subluminal and superluminal light propagation in the inverted-Y configuration

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

Observation of dual electromagnetically induced transparencies in cold $^{87}Rb$ atoms

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