Rydberg-atom acceleration by tightly focused intense laser pulses

Cai, Peng; Zha, Jiajia; Xie, Yijin; Qi, Weizhi; Wang, P. X.

doi:10.1103/physreva.99.053401

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…Since our previous results show that the transverse acceleration has a greater performance when 4 He atoms are excited before the laser pulse [14,26], we choose η 0 = −2cτ for the transverse acceleration in figures 8(a) and (b). As shown in figure 8(a), at the beam waist (z = 0), the area where the transverse exit velocity of an excited atom is zero increases with the value of N. The transverse acceleration increases significantly in the edge of the flattened area but the increasing trend slows down with increasing N value.…”

Section: Fgb Accelerationmentioning

confidence: 99%

“…Since our previous results show that the longitudinal acceleration has a greater performance when the 4 He atom is excited in the laser pulse center [14,26], we choose η 0 = 0 for the longitudinal acceleration in figures 8(c) and (d). Although for a wider range (|z 0 | > 2Z RN ) of the on-axis (r 0 = 0) and off-axis (r 0 = 0.5w N (0)), high-order FGBs (N > 0) induce a higher longitudinal exit velocities than the fundamental mode Gaussian beam.…”

Section: Fgb Accelerationmentioning

confidence: 99%

“…Unlike the electromagnetic force of an optical field, the ponderomotive force depends only on the intensity of the optical field and averages the phase [13]. We further investigated this scheme theoretically [14]. However, the interaction between light and atoms in this scheme is not a simple process [15].…”

Section: Introductionmentioning

confidence: 99%

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Neutral particle acceleration by spatially modulated laser pulses

Yan

Wang

et al. 2023

New J. Phys.

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The velocity gain of neutral particles (atoms, molecules, etc.) from laser acceleration is always small. A possible scheme to obtain a high speed neutral particle beam is multistage acceleration. However, according to previous theoretical and experimental studies, generally, lateral acceleration is larger than longitudinal acceleration. These transverse velocities destroy the expected quality of the longitudinally transmitted neutral particle beam. In order to realize multistage accelerations of neutral particle, it is necessary to restrain the beam divergence caused by lateral acceleration. How to optimize and utilize these laterally accelerated neutral particles is worthy of in-depth study. In this paper, we use a multi-mode combined laser pulse and a flattened Gaussian laser pulse to accelerate the neutral atoms. The transverse divergence of the beam is well controlled while the longitudinal acceleration is retained, which provides the possibility for improving the beam quality of neutral particles as well as the corresponding multistage acceleration.

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Section: Fgb Accelerationmentioning

confidence: 99%

Section: Fgb Accelerationmentioning

confidence: 99%

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Neutral particle acceleration by spatially modulated laser pulses

Yan

Wang

et al. 2023

New J. Phys.

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“…Further, ponderomotive level shifts in high-intensity laser fields were observed in atoms [6,7] and in molecules [8], as well as in high-intensity multi-photon ionization [9], in highintensity zero-kinetic-energy photoelectron (ZEKE) spectroscopy [10], and in optical [11,12] and microwave [13,14] above-threshold ionization. Ponderomotive forces on atomic electrons are important in atom dynamics in highintensity laser pulses [15][16][17]. Ponderomotive effects are also known from Paul ion traps, where the ponderomotive force drives the secular motion, while the micromotion occurs at the trap's radio-frequency drive [18].…”

Section: Introductionmentioning

confidence: 99%

Modulation spectroscopy of Rydberg atoms in an optical lattice

2020

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We develop and study quantum and semi-classical models of Rydberg-atom spectroscopy in amplitude-modulated optical lattices. Both initial-and target-state Rydberg atoms are trapped in the lattice. Unlike in any other spectroscopic scheme, the modulation-induced ponderomotive coupling between the Rydberg states is spatially periodic and perfectly phase-locked to the lattice trapping potentials. This leads to a novel type of sub-Doppler mechanism, which we explain in detail. In our exact quantum model, we solve the time-dependent Schrödinger equation in the product space of center-of-mass (COM) momentum states and the internal-state space. We also develop a perturbative model based on the band structure in the lattice and Fermi's golden rule, as well as a semi-classical trajectory model in which the COM is treated classically and the internal-state dynamics quantum-mechanically. In all models we obtain the spectrum of the target Rydbergstate population versus the lattice modulation frequency, averaged over the initial thermal COM momentum distribution of the atoms. We investigate the quantum-classical correspondence of the problem in several parameter regimes and exhibit spectral features that arise from vibrational COM coherences and rotary-echo effects. Applications in Rydberg-atom spectroscopy are discussed.

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“…In recent years, a rapid growing research interest has been attracted in the tight focusing of various polarized light waves, optical vortices, and laser pulses through a high numerical aperture (NA) objective lens, because of its unique properties and potential applications in single molecule imaging, microscopy, and optical manipulation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. On the other hand, as circularly polarized optical vortices could be decomposed into radial and azimuthal polarization, then with proper combination of vortex charge and circular polarization handedness, a focusing field with extremely strong longitudinal component and flat-topped profile could be generated [5].…”

Section: Introductionmentioning

confidence: 99%

Strongly Focused Circularly Polarized Optical Vortices Regulated by a Fractal Conical Lens

et al. 2019

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In this paper, a recently-proposed pure-phase optical element, the fractal conical lens (FCL), is introduced for the regulation of strongly-focused circularly-polarized optical vortices in a high numerical aperture (NA) optical system. Strong focusing characteristics of circularly polarized optical vortices through a high NA system in cases with and without a FCL are investigated comparatively. Moreover, the conversion between spin angular momentum (SAM) and orbital angular momentum (OAM) of the focused optical vortex in the focal vicinity is also analyzed. Results revealed that a FCL of different stage S could significantly regulate the distributions of tight focusing intensity and angular momentum of the circularly polarized optical vortex. The interesting results obtained here may be advantageous when using a FCL to shape vortex beams or utilizing circularly polarized vortex beams to exploit new-type optical tweezers.

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Rydberg-atom acceleration by tightly focused intense laser pulses

Cited by 9 publications

References 25 publications

Neutral particle acceleration by spatially modulated laser pulses

Neutral particle acceleration by spatially modulated laser pulses

Modulation spectroscopy of Rydberg atoms in an optical lattice

Strongly Focused Circularly Polarized Optical Vortices Regulated by a Fractal Conical Lens

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