Neutral particles pushed or pulled by laser pulses

Wang, P. X.; Qi, Weizhi; Cai, Peng; Wang, J. X.; Ho, Y. K.

doi:10.1364/ol.41.000230

Cited by 20 publications

(6 citation statements)

References 27 publications

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“…Comparing the measured deflections with those derived from a simple model, where the atom is impulsively accelerated by the ponderomotive force acting on the electron, we obtain good agreement for He and Ne [57]. More recently, more elaborate calculations have been published, which affirm the model [58,59]. The maximum final velocity of the He atoms of ∼55m s −1 , estimated from the atom deflection at a peak intensity of ( = Í 7 10 15 W cm −2 ) results from an effective acceleration of ´g 2 10 14 in the field gradient during the short laser pulse, where g is Earth's gravitational acceleration.…”

Section: Acceleration Of Strong-field Excited Atomssupporting

confidence: 62%

Atomic excitation and acceleration in strong laser fields

Zimmermann

Eichmann

2016

Phys. Scr.

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Atomic excitation in the tunneling regime of a strong-field laser-matter interaction has been recently observed. It is conveniently explained by the concept of frustrated tunneling ionization (FTI), which naturally evolves from the well-established tunneling picture followed by classical dynamics of the electron in the combined laser field and Coulomb field of the ionic core. Important predictions of the FTI model such as the n distribution of Rydberg states after strongfield excitation and the dependence on the laser polarization have been confirmed in experiments. The model also establishes a sound basis to understand strong-field acceleration of neutral atoms in strong laser fields. The experimental observation has become possible recently and initiated a variety of experiments such as atomic acceleration in an intense standing wave and the survival of Rydberg states in strong laser fields. Furthermore, the experimental investigations on strong-field dissociation of molecules, where neutral excited fragments after the Coulomb explosion of simple molecules have been observed, can be explained. In this review, we introduce the subject and give an overview over relevant experiments supplemented by new results.

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Section: Acceleration Of Strong-field Excited Atomssupporting

confidence: 62%

Atomic excitation and acceleration in strong laser fields

Zimmermann

Eichmann

2016

Phys. Scr.

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“…When the light intensity is relatively low (<< 10 18 W cm −2 ), the ponderomotive force on a Rydberg atom with single electron excitation can be approximated by [11,26]:…”

Section: Calculation Model and Resultsmentioning

confidence: 99%

“…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%

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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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“…Optical trapping and manipulating of micron-sized particles have attracted enormous interests in optical tweezers because of the advantages of being noncontact and noninvasive since the pioneering work by Ashkin and his coworkers who first successfully captured a dielectric sphere by using a single laser beam 1 . This optical trapping has been applied in various areas including physics, chemistry, and biophysics 2 , and it can be used to manipulate kinds of tiny objects such as uncharged atoms and molecules 3 , living biological cells 4 , DNA molecules 5 , metallic spheres 6 , 7 , magnetodielectric particles 8 , and so on. As a consequence, optical tweezers have been developed into one of the most promising tools in micromanipulation from trapping to rotating and sorting 9 – 13 .…”

Section: Introductionmentioning

confidence: 99%

Radiation forces of beams generated by Gaussian mirror resonator on a Rayleigh dielectric sphere

Tang

Chen

Bian

et al. 2017

Sci Rep

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Optical trapping and manipulating of micron-sized particles have attracted enormous interests due to the potential applications in biotechnology and nanoscience. In this work, we investigate numerically and theoretically the radiation forces acting on a Rayleigh dielectric particle produced by beams generated by Gaussian mirror resonator (GMR) in the Rayleigh scattering regime. The results show that the focused beams generated by GMR can be used to trap and manipulate the particles with both high and low index of refractive near the focus point. The influences of optical parameters of the beams generated by GMR on the radiation forces are analyzed in detail. Furthermore, the conditions for trapping stability are also discussed in this paper.

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Neutral particles pushed or pulled by laser pulses

Cited by 20 publications

References 27 publications

Atomic excitation and acceleration in strong laser fields

Atomic excitation and acceleration in strong laser fields

Neutral particle acceleration by spatially modulated laser pulses

Radiation forces of beams generated by Gaussian mirror resonator on a Rayleigh dielectric sphere

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