Atomic population inversion and absorption dispersion-spectra driven by modified double-exponential quotient pulses in a three-level atom

Boutabba, N.; Grira, Sofiane; Eleuch, Hichem

doi:10.1016/j.rinp.2021.104108

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…In the formula, the Gaussian spectrum is proportional to pulse rise time which is proportional to Pw. In addition, the time-bandwidth product is derived in terms of both the spectral and temporal widths, FWHM [28]. Where P w is FWHM of the laser pulse, A is average peak photon number in time slot.…”

Section: Laser Searching Experiments At 1064 Nm 31 Simulationmentioning

confidence: 99%

Effect of Lidar Receiver Field of View on UAV Detection

Chen

Yu²,

Tang

et al. 2022

Photonics

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Researchers have shown that single-photon light detection and ranging (lidar) is highly sensitive and has a high temporal resolution. Due to the excellent beam directivity of lidar, most applications focus on ranging and imaging. Here, we present a lidar detection system for night environments. Different from MEMS, we choose a large divergence rather than scanning to detect unmanned aerial vehicles (UAVs). Collection and detection are achieved through the use of high-efficiency optical devices. With time-correlated single photon counting (TCSPC), we performed subsequent drone search work at centimeter resolution. We believe that we have developed a new technique for detecting UAVs. We show how the field of view influences the detection process. For some key areas of air defense, it is extremely necessary to find UAVs quickly and in a timely manner. In short, the results represent an important step toward practical, low-power drone detection using lidar.

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Section: Laser Searching Experiments At 1064 Nm 31 Simulationmentioning

confidence: 99%

Effect of Lidar Receiver Field of View on UAV Detection

Chen

Yu²,

Tang

et al. 2022

Photonics

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“…The field's temporal and spatial structures are the two most important requirements. As a result, the pulse rise time for a pulsed field should be less than the time constant of any decay mechanism in order to detect coherent effects [53]. These coherent effects are related to the atomic absorption and hence to the refractive index (here in means of the off-diagonal elements of the density matrix).…”

Section: The Refractive Indexmentioning

confidence: 99%

Controllable refractive index in a four-level left-handed medium using pulse shaping

Boutabba¹

2021

J. Opt.

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In this paper we control the negative refractive index of a four-level left-handed medium by applying different waveforms to excite the atomic system. The control field is a few-cycle strong pulse described by a double exponential function, and its modified forms, a Gaussian field, and a tan-hyperbolic pulse. The considered four-level system was fully analyzed in terms of the density matrix formalism under the rotating wave approximation, and the refractive index for various control fields was obtained. Hence, under specific conditions, the tunneling, and the modulation of the negative refractive index are achieved for various shaped waveforms. Such strong-shaped laser pulses open the way to fully control the system.

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“…On the other hand, the science of negative refractive index materials [19][20][21], has captivated many researchers because these media exhibit counter-intuitive optical properties in which a wave encounters negative refraction at an interface resulting in a backward transmission [22]. Hence, a high resolution was possible below the diffraction limit leading to high precision in the sub-wavelength imaging [23], the terahertz engineered absorbers [24], anti-reflective coated lenses [25], and conversion polarizers [26].…”

Section: Introductionmentioning

confidence: 99%

Light drag in an optically dense left-handed atomic medium

Ali

Boutabba

2023

Phys. Scr.

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In this paper, we investigate the light drag in an optically dense negative refractive index medium. Our model is a four-level atomic system in which we demonstrate an enhancement of the light drag while keeping the negative refraction condition. Furthermore, we control the shift in the light-drag by tuning both the strong coupling field and the detuning. Hence, we observe that, the light drag in the negative refractive index material can be controlled to switch from subluminal to superluminal at various range of the detuning. Our system suggests a straight forward technique for realizing and controlling light dragging in materials with negative refractive indices, or "NRI," which might open the way for more efficient use of left-handedness in atomic systems.

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Atomic population inversion and absorption dispersion-spectra driven by modified double-exponential quotient pulses in a three-level atom

Cited by 10 publications

References 15 publications

Effect of Lidar Receiver Field of View on UAV Detection

Effect of Lidar Receiver Field of View on UAV Detection

Controllable refractive index in a four-level left-handed medium using pulse shaping

Light drag in an optically dense left-handed atomic medium

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