Large cross-phase-modulation between two slow pulses by coupled double dark resonances

Hou, Bo‐Yu; Wei, L. F.; Long, GL; Wang, S. J.

doi:10.1103/physreva.79.033813

Cited by 16 publications

(6 citation statements)

References 30 publications

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“…The effect of cross nonlinearity on the light propagation in the Doppler-broadened medium with different laser propagating configurations has been investigated. [38] The effect of Doppler broadening due to the atom's thermal velocity v can be included by replacing the ∆ p , ∆ c , and ∆ s by…”

Section: Resultsmentioning

confidence: 99%

Phase-Controlled Transparent Superluminal Light Propagation in a Doppler-Broadened Four-Level N-Type System

Zohravi¹,

Abedi²,

Mahmoudi³

2014

Commun. Theor. Phys.

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Abstract. The propagation of a weak probe field in a four-level N-type quantum system in the presence of spontaneously generated coherence (SGC) is theoretically investigated. The optical properties of the system are studied and it is shown that the group velocity of light pulse can be controlled by relative phase of applied fields. By changing the relative phase of applied fields, the group velocity of light pulse changes from transparent subluminal to the transparent superluminal light propagation. Thus, the phase-controlled absorption-free superluminal light propagation is obtained without applying an incoherent laser fields to the system. The propagation of a weak probe light pulse is studied by solving the Maxwell's wave equation on numerical grid in space and time. Moreover, we study the third order self-and cross-Kerr susceptibility of probe field and calculate the nonlinear cross-phase shift for different values of intensity of applied fields. In addition, we take into account the effect of Doppler broadening on the light pulse propagation and it is found that a suitable choice of laser propagation directions allows us to preserve our results even in the presence of Doppler effect. It is demonstrated that by increasing the Doppler width of distribution to the room temperature, the dispersion changes from transparent subluminal to transparent superluminal light propagation which is our major motivation for this work.

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Section: Resultsmentioning

confidence: 99%

Phase-Controlled Transparent Superluminal Light Propagation in a Doppler-Broadened Four-Level N-Type System

Zohravi¹,

Abedi²,

Mahmoudi³

2014

Commun. Theor. Phys.

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“…41) And the influence of the VIC on a multilevel atomic system has been discussed. [42][43][44][45] In this paper, we investigate the effects of SV on the transient process in a _-type three-level system with near-degenerate levels in the presence or the absence of the VIC. It is well displayed that due to the effects of SV, there appear some interesting transient properties in the _-type system.…”

Section: Introductionmentioning

confidence: 99%

Transient response in a three-level system with the squeezed vacuum

Zeng

Hou

Gao

et al. 2012

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In this paper, the effects of the squeezed vacuum (SV) on the transient response in a _-type three-level atomic medium are investigated. We find that the properties of transient process can be greatly affected by the SV whether the vacuuminduced coherence (VIC) exists or not. The combined influence of the SV and the VIC can dramatically modify the transient absorption and gain. Especially, the transient gain can be almost eliminated in the absence of VIC. And the response time from the transient to the steady situation is dependent on the SV. When including the VIC, the transient and steady optical properties display a reverse variation with the SV. Besides, it is shown that the considerable steady state population without inversion can be always induced by the SV. #

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“…The advantage of this approach is a larger nonlinear atomic response with low absorption of the control beam. Much progress has been done following variants of this path [5][6][7][8][9][10][11][12][13][14][15][16], nevertheless the largest phase shift to date, known to the authors of this work, on a probe pulse modulated by a control pulse of about ∼400 photons is of only 5 mrad (∼12.5 µrad/photon) [17]. An ongoing discussion [18,19] about the impossibility of attaining larger XPM using this EIT mechanism began about eight years ago.…”

Section: Introductionmentioning

confidence: 99%

Cross-phase modulation enhancement via a resonating cavity: semiclassical description

Martínez-Rincón¹,

Howell²

2016

J. Opt. Soc. Am. B

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We evaluate the advantages of performing cross-phase modulation (XPM) on a very-far-off-resonance atomic system. We consider a ladder system with a weak (few-photon level) control coherent field imparting a conditional nonlinear phase shift on a probe beam. We find that by coupling to an optical resonator, the optimal XPM is enhanced proportional to the finesse of the resonator by a factor of F ∕4π. We present a semiclassical description of the system and show that the phenomenon is optimal in the self-defined condition of off-resonance effective cooperativity equal to one.

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Large cross-phase-modulation between two slow pulses by coupled double dark resonances

Cited by 16 publications

References 30 publications

Phase-Controlled Transparent Superluminal Light Propagation in a Doppler-Broadened Four-Level N-Type System

Phase-Controlled Transparent Superluminal Light Propagation in a Doppler-Broadened Four-Level N-Type System

Transient response in a three-level system with the squeezed vacuum

Cross-phase modulation enhancement via a resonating cavity: semiclassical description

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