Optical Precursors with Electromagnetically Induced Transparency in Cold Atoms

Dong, Wei; Chen, Jiefei; Loy, M. M. T.; Wong, George K.; Du, Shengwang

doi:10.1103/physrevlett.103.093602

Cited by 81 publications

(60 citation statements)

References 17 publications

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“…Motivated by the observation of precursory spikes at the leading edge of biphoton correlation with electromagnetically induced transparency (EIT) [11,12], the classical step-on pulse transmission in EIT medium has been studied theoretically [13,14]. Most recently, observation of optical precursors at both rising and falling edges of a square pulse passing through an EIT system has been reported [15]. Combining EIT and optical precursors makes it possible to control the delay between precursors and main signal for the application of active optical devices.…”

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confidence: 99%

“…With EIT slow light effect, the main field is delayed and E M − (z, t) can be approximated as a constant field within the time when the precursors occur [15]. The normalized intensities of total precursors…”

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confidence: 99%

“…(5)- (6) of Ref. [13], and approximated as a Bessel function [15,17] explaining oscillatory patterns in insets of Fig. 2 and Fig.…”

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confidence: 99%

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Slow-light-induced interference with stacked optical precursors for square input pulses

Jeong

2010

Opt. Lett.

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We theoretically study the stacked optical transients generated from a series of square pulses passing through a cold atomic ensemble. Using the hybrid analysis and fast Fourier transform, we identify the stacked coherent transients (Segard et al. 1987) as optical precursors. With slow light and electromagnetically induced transparency, we obtain nearly 700 % transmitted intensity at the transient spikes resulting from the interference between the delayed main field and the stacked optical precursors.

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Slow-light-induced interference with stacked optical precursors for square input pulses

Jeong

2010

Opt. Lett.

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“…This leads to a simple multiplication of β by 1 + 1/ (α c ℓ) in the first form of Eq. (17). The inset of Fig.…”

Section: Response To Step-modulated Sine-wavesmentioning

confidence: 99%

“…A qualitative demonstration of separated Sommerfeld and Brillouin precursors has only been performed in microwaves by using guiding structures with dispersion characteristics similar to those of a Lorentz medium [11]. In optics, only the unique precursor resulting from a complete overlapping of the Sommerfeld and Brillouin precursors [12,13] has been actually observed [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Brillouin precursors in Debye media

Macke

Ségard

2015

Phys. Rev. A

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We theoretically study the formation of Brillouin precursors in Debye media. We point out that the precursors are visible only at propagation distances such that the impulse response of the medium is essentially determined by the frequency dependence of its absorption and is practically Gaussian. By simple convolution, we then obtain explicit analytical expressions of the transmitted waves generated by reference incident waves, distinguishing precursor and main signal by a simple examination of the long-time behavior of the overall signal. These expressions are in good agreement with the signals obtained in numerical or real experiments performed on water in the radio-frequency domain and explain in particular some observed shapes of the precursor. Results are obtained for other remarkable incident waves. In addition, we show quite generally that the shape of the Brillouin precursor appearing alone at sufficiently large propagation distance and the law giving its amplitude as a function of this distance do not depend on the precise form of the incident wave but only on its integral properties. The incidence of a static conductivity of the medium is also examined and explicit analytical results are again given in the limit of weak and strong conductivities.

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Shaping Temporal Correlation of Biphotons in a Hot Atomic Ensemble

Zhao

Qin

et al. 2021

Advanced Photonics Research

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The biphoton states have served as one of the candidates for most quantum‐enabled technologies. Moreover, with the benefit of photon–atom interactions, biphotons with controllable wave functions are particularly interesting in quantum information processes. Herein, an experimental realization of the shaping temporal correlation of biphotons from the four‐wave mixing process in a hot Rb atomic ensemble is presented. Based on the slow‐light effect and electromagnetically induced transparency in the group delay region, the precursor‐like propagation is observed and separated from the rising edge of the delayed wave packets of biphotons temporal correlation. In addition, the application of an additional dressing field enriches the features of the biphotons temporal correlation such as the manipulation of the dispersion experienced by the generated photons and controllable coherent time. Furthermore, with a higher optical depth and stronger dressing coupling effect, the temporal correlation of biphotons is shaped from the group delay region to the Rabi oscillation region and even superposed of them.

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Optical Precursors with Electromagnetically Induced Transparency in Cold Atoms

Cited by 81 publications

References 17 publications

Slow-light-induced interference with stacked optical precursors for square input pulses

Slow-light-induced interference with stacked optical precursors for square input pulses

Brillouin precursors in Debye media

Shaping Temporal Correlation of Biphotons in a Hot Atomic Ensemble

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