Superluminal two-color light in a multiple Raman gain medium

Kudriašov, V.; Ruseckas, Julius; Mekys, Algirdas; Экерс, А.; Безуглов, Н. Н.; Juzeliūnas, Gediminas

doi:10.1103/physreva.90.033827

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…The magnetic sublevel 6S 1/2 , |F = 4, m = −2 corresponds to the level Y . Also, the levels 5P 3/2 , |F = 4, m = −3 and 6P 1/2 , |F = 4, m = −3 are excited levels U 1 and U 2 , respectively [41].…”

Section: Discussionmentioning

confidence: 99%

“…Yet such a superluminal propagation is hardly observed due to losses [35]. Some novel approaches have been proposed to utilize transparent spectral regions for fast light [37][38][39][40][41]. Specifically, it was shown that a linear anomalous dispersion can be created in a Raman gain doublet and therefore distorsionless pulse propagation is possible [38].…”

Section: Introductionmentioning

confidence: 99%

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Off-axis optical vortices using double-Raman singlet and doublet light-matter schemes

Hamedi,

Ruseckas,

Paspalakis

et al. 2020

Preprint

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We study the formation of off-axis optical vortices propagating inside a double-Raman gain atomic medium. The atoms interact with two weak probe fields as well as two strong pump beams which can carry orbital angular momentum (OAM). We consider a situation when only one of the strong pump lasers carries an OAM. A particular superposition of probe fields coupled to the matter is shown to form specific optical vortices with shifted axes. Such off-axis vortices can propagate inside the medium with sub-or superluminal group velocity depending on the value of the two-photon detuning. The superluminal optical vortices are associated with the amplification as the energy of pump fields is transferred to the probe fields. The position of the peripheral vortices can be manipulated by the OAM and intensity of the pump fields. We show that the exchange of optical vortices is possible between individual probe beams and the pump fields when the amplitude of the second probe field is zero at the beginning of the atomic cloud. The model is extended to a more complex double Raman doublet interacting with four pump fields. In contrast to the double-Raman-singlet, now the generation of the off-axis sub-or superluminal optical vortices is possible even for zero two-photon detuning.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Off-axis optical vortices using double-Raman singlet and doublet light-matter schemes

Hamedi,

Ruseckas,

Paspalakis

et al. 2020

Preprint

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“…Earlier theoretical studies for the localization mostly consider one-dimensional (1D) atom localization based on the atomic coherence and quantum interference effects [8][9][10][11][12]. Note that the quantum coherence and interference play a fundamental role in many other phenomena of atomic physics * hamid.hamedi@tfai.vu.lt † gediminas.juzeliunas@tfai.vu.lt and quantum optics, such as an electromagnetically induced transparency (EIT) [13][14][15][16][17][18], superluminal light propagation [19][20][21][22], optical bistability [23,24], Kerr nonlinearity [25,26], and others [27][28][29]. More recently, some schemes have been put forward for two-dimensional (2D) atom localization [30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Phase-sensitive atom localization for closed-loop quantum systems

Hamedi

Juzeliūnas

2016

Phys. Rev. A

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A scheme of high-precision two-and three-dimensional (3D) atom localization is proposed and analyzed by using a density matrix method for a five-level atom-light coupling scheme. In this system four strong laser components (which could be standing waves) couple a pair of atomic internal states to another pair of states in all possible ways to form a closed-loop diamond-shape configuration of the atom-light interaction. By systematically solving the density matrix equations of the motion, we show that the imaginary part of the susceptibility for the weak probe field is position dependent. As a result, one can obtain information about the position of the atom by measuring the resulting absorption spectra. Focusing on the signatures of the relative phase of the applied fields stemming from the closed-loop structure of the diamond-shape subsystem, we find out that there exists a significant phase dependence of the eigenvalues required to have a maximum in the probe absorption spectra. It is found that by properly selecting the controlling parameters of the system, a nearly perfect 2D atom localization can be obtained. Finally, we numerically explore the phase control of 3D atom localization for the present scheme and show the possibility to obtain 1/2 detecting probability of finding the atom at a particular volume in 3D space within one period of standing waves.

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“…Quantum coherence and interference are two appealing phenomena which can lead to many interesting linear and nonlinear optical properties such as superluminal light propagation [1], optical bistability and Kerr nonlinearity [2][3][4][5][6][7][8][9][10], electromagnetically induced transparency (EIT) [11,12], four-wave mixing (FWM) [13][14][15], optical solitons [16,17], atom localization [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] etc.…”

Section: Introductionmentioning

confidence: 99%

2D spatial distribution of probe absorption in a triple semiconductor quantum well nanostructure

2015

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We investigate the two-dimensional (2D) position-dependent probe absorption in a triple semiconductor quantum well (SQW) structure driven coherently by two orthogonal standingwave fields. Under weak probe field approximation and utilizing the density matrix approach, an analytical solution is presented for the probe linear susceptibility which clarifies directly the spatial-dependent nature of the probe absorption. Then, the distribution of probe absorption in 2D is numerically explored. It is found that 2D absorption spectra are very sensitive to the intensity and frequency detuning of standing-wave fields which can result in various 2D localization structures in one period of standing waves in the x-y plane.

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Superluminal two-color light in a multiple Raman gain medium

Cited by 6 publications

References 35 publications

Off-axis optical vortices using double-Raman singlet and doublet light-matter schemes

Off-axis optical vortices using double-Raman singlet and doublet light-matter schemes

Phase-sensitive atom localization for closed-loop quantum systems

2D spatial distribution of probe absorption in a triple semiconductor quantum well nanostructure

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