Hot electrons in the interaction of femtosecond laser pulses with foil targets at a moderate laser intensity

Li, Y. T.; Zhang, J.; Chen, L. M.; Mu, Yunfeng; Liang, Tianjiao; Wei, Zhiyi; Dong, Qiao-Li; Chen, Z. L.; Teng, Hao; Shutai, Chunyu; Jiang, Wei; Zhi-Jian, Zheng; Tang, Xiaoping

doi:10.1103/physreve.64.046407

Cited by 32 publications

(17 citation statements)

References 34 publications

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“…These experiments usually produce large divergence electron beams with energies ranging from hundreds of keV [4,[12][13][14] to few MeV [15]. Some experiments reported on beams emitted in the specular direction [15], while others reported on beams emitted along the surface [16] or in the normal direction [17]. The diversity in the results can be explained by the fact that these experiments used different gradient scale lengths and intensities.…”

Section: Introductionmentioning

confidence: 99%

On the physics of electron ejection from laser-irradiated overdense plasmas

2016

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International audienceUsing 1D and 2D PIC simulations, we describe and model the backward ejection of electron bunches when a laser pulse reflects off an overdense plasma with a short density gradient on its front side. The dependence on the laser intensity and gradient scale length is studied. It is found that during each laser period, the incident laser pulse generates a large charge-separation field, or plasma capacitor, which accelerates an attosecond bunch of electrons toward vacuum. This process is maximized for short gradient scale lengths and collapses when the gradient scale length is comparable to the laser wavelength. We develop a model that reproduces the electron dynamics and the dependence on laser intensity and gradient scale length. This process is shown to be strongly linked with high harmonic generation via the Relativistic Oscillating Mirror mechanism. VC 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)

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Section: Introductionmentioning

confidence: 99%

On the physics of electron ejection from laser-irradiated overdense plasmas

2016

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“…Figure 2 shows the energy spectra of fast electrons emitted into vacuum close to the direction parallel to the target surface, when θ is 45°and 70°, respectively. The electron spectra are fitted by the exponential distribution function (Li et al, 2001), to estimate the fast electron temperature T hot . For the 45°case, T hot is 276 keV, which is close to the value by Beg's (1997) scaling.…”

Section: Resultsmentioning

confidence: 99%

Directional transport of fast electrons at the front target surface irradiated by intense femtosecond laser pulses with preformed plasma

Lin

Liu

et al. 2012

Laser Part. Beams

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The effects of laser incidence angle on lateral fast electron transport at front target surface, when a plasma is preformed, irradiated by intense (>10 18 W/cm 2 ) laser pulses, are studied by K α imaging technique and electron spectrometer. A horizontally asymmetric K α halo, resulting from directional lateral electron transport and energy deposition, is observed for a large incidence angle (70°). Moreover, a group of MeV high energy electrons is emitted along target surface. It is believed that the deformed preplasma and the asymmetrical distribution of self-generated magnetic field, at large incidence angle, play an important role in the directional lateral electron transport.

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“…Collimated electron beams in the target normal direction and the laser specular direction have been observed under the non-relativistic laser conditions [1][2][3][4] . In the relativistic regime, hot electron bunches with maximum energy of tens of MeV are observed in the target normal direction and the laser propagation direction during the laser-solid interactions [5][6][7][8] .…”

Section: Introductionmentioning

confidence: 98%

Generation of surface electrons in femtosecond laser-solid interactions

Yuan

et al. 2006

SCI CHINA SER G

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The characteristics of hot electrons produced by p-polarized femtosecond laser-solid interactions are studied. The experimental results show that the outgoing electrons are mainly emitted in three directions: along the target surface, the normal direction and the laser backward direction. The electrons flowing along the target surface are due to the confinement of the electrostatic field and the surface magnetic field, while the electrons in the normal direction due to the resonant absorption.

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Hot electrons in the interaction of femtosecond laser pulses with foil targets at a moderate laser intensity

Cited by 32 publications

References 34 publications

On the physics of electron ejection from laser-irradiated overdense plasmas

On the physics of electron ejection from laser-irradiated overdense plasmas

Directional transport of fast electrons at the front target surface irradiated by intense femtosecond laser pulses with preformed plasma

Generation of surface electrons in femtosecond laser-solid interactions

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