Generation of High-Density Electrons Based on Plasma Grating Induced Bragg Diffraction in Air

Shi, Liping; Li, Wenxue; Wang, Yongdong; Lu, Xia; Ding, Liang’en; Zeng, Heping

doi:10.1103/physrevlett.107.095004

Cited by 78 publications

(51 citation statements)

References 27 publications

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“…In our experiments, 800-nm Ti:sapphire femtosecond laser pulses with pulse energy of ∼25 mJ were frequency tripled by using three β-barium borate (β-BBO) crystals to generate the third harmonic (TH) pulse at 267 nm of ∼2 mJ pulse energy [10]. The schematic of the experiment setup is given in Fig.…”

Section: Resultsmentioning

confidence: 99%

Enhanced fluorescence emission of helium atoms by seeded optically driven impact excitation

Shi

Bai

et al. 2013

Phys. Rev. A

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We demonstrated enhancement of fluorescence emission from helium atoms in terms of ultraviolet and infrared filaments nonlinear interaction in a mixture of argon and helium atomic gases. The seed electrons produced by ultraviolet pulses were accelerated by infrared filaments to kick a significant amount of helium atoms into high-lying excited states. This provided a method to efficiently excite helium atoms through electron collisions for further investigation on electron-ion collisions and their effects on atomic coherence behavior.

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Section: Resultsmentioning

confidence: 99%

Enhanced fluorescence emission of helium atoms by seeded optically driven impact excitation

Shi

Bai

et al. 2013

Phys. Rev. A

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“…While under the scheme of IR+blue plasma grating, deeper damage was created in morphology compared with the case of infrared filament or blue grating. 14 Additionally, periodical surface structures were also observed after slightly damage by the coherent blue grating, similar phenomenon cannot be visible in (c) and (f) because of near-surface plasma induced cooling solidification. Under few shots damage, ionization happened on the surface of metallic materials.…”

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confidence: 82%

“…Then the plasma grating was probed by a delayed infrared beam (IR) which was injected at Bragg angle in order to produce more electrons, 14 this scheme produces relatively high density of plasma. Here we name it as "IR+blue plasma grating".…”

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confidence: 99%

Enhanced filament ablation of metals based on plasma grating in air

et al. 2015

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We demonstrate efficient ablation of metals with filamentary plasma grating generated by two intense blue femtosecond filaments and a third focused infrared pulse. This scheme leads to significant promotion of ablation efficiency on metal targets in air in comparison with single infrared or blue filament with equal pulse energy. The reason is that the blue plasma grating firstly provides stronger intensity and a higher density of background electrons, then the delayed infrared pulse accelerates local electrons inside the plasma grating. These two processes finally results in robustly increased electron density and highly ionized metallic atoms.

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“…It was found that two noncollinearly overlapped filaments created a wavelengthscale periodic plasma density modulation [17][18][19], which guided the input pulses similar to a photonic crystal plasma waveguide. The incident pulses were partly guided along those waveguides [17], which is consistent with the observed filament profiles in the far-field region.…”

Section: Introductionmentioning

confidence: 99%

Computational modeling of laser-plasma interactions: Pulse self-modulation and energy transfer between intersecting laser pulses

2013

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The nonlinear interaction of intense femtosecond laser pulses with a self-induced plasma channel in air and the energy transfer between two intersecting laser pulses were simulated using the finite-difference time-domain particle-in-cell method. Implementation of a simple numerical code enabled modeling of various phenomena, including pulse self-modulation in the spatiotemporal and spectral domains, conical emission, and energy transfer between two intersecting laser beams. The mechanism for energy transfer was found to be related to a plasma waveguide array induced by Moiré patterns of the interfering electric fields. The simulation results provide a persuasive replication and explanation of previous experimental results, when carried out under comparable physical conditions, and lead to prediction of others. This approach allows us to further examine the effect of the laser and plasma parameters on the simulation results and to investigate the underlying physics.

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Generation of High-Density Electrons Based on Plasma Grating Induced Bragg Diffraction in Air

Cited by 78 publications

References 27 publications

Enhanced fluorescence emission of helium atoms by seeded optically driven impact excitation

Enhanced fluorescence emission of helium atoms by seeded optically driven impact excitation

Enhanced filament ablation of metals based on plasma grating in air

Computational modeling of laser-plasma interactions: Pulse self-modulation and energy transfer between intersecting laser pulses

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