Absorption of ultrashort intense lasers in laser–solid interactions

Sheng, Zheng-Ming; Weng, Shangkun; Yu, Lei; Wang, Weimin; Yun-Qian, Cui; Chen, Min; Zhang, Jie

doi:10.1088/1674-1056/24/1/015201

Cited by 25 publications

(14 citation statements)

References 137 publications

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“…Different approaches such as varying the target thickness [8], nanostructuring the back surface of the target [9,10] or growing a layer of low density foam [11][12][13] have already been studied. Several publications have reported that adding periodic nanostructures on the target front surface enhances drastically the laser energy absorption [13][14][15][16][17][18][19][20][21]. This generates ions with much higher energies than the ones obtained when targets with a flat surface are used [13,[20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Table-top laser-based proton acceleration in nanostructured targets

et al. 2017

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The interaction of ultrashort, high intensity laser pulses with thin foil targets leads to ion acceleration on the target rear surface. To make this ion source useful for applications, it is important to optimize the transfer of energy from the laser into the accelerated ions. One of the most promising ways to achieve this consists in engineering the target front by introducing periodic nanostructures. In this paper, the effect of these structures on ion acceleration is studied analytically and with multidimensional particle-in-cell simulations. We assessed the role of the structure shape, size, and the angle of laser incidence for obtaining the efficient energy transfer. Local control of electron trajectories is exploited to maximize the energy delivered into the target. Based on our numerical simulations, we propose a precise range of parameters for fabrication of nanostructured targets, which can increase the energy of the accelerated ions without requiring a higher laser intensity.

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Section: Introductionmentioning

confidence: 99%

Table-top laser-based proton acceleration in nanostructured targets

et al. 2017

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“…This collision-less process is most efficient for parallel polarized laser beams irradiating at a large incident angle. The laser energy will be transferred to the electron plasma in the region of the critical plasma density, where the electron plasma frequency is equal to the laser frequency [ 19 ]. The highly excited plasma electrons interact with the bound electrons of the target atoms by collisional impact ionization, leaving vacant energy levels.…”

Section: Resultsmentioning

confidence: 99%

Study on X-ray Emission Using Ultrashort Pulsed Lasers in Materials Processing

et al. 2021

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The interaction of ultrashort pulsed laser radiation with intensities of 1013 W cm−2 and above with materials often results in an unexpected high X-ray photon flux. It has been shown so far, on the one hand, that X-ray photon emissions increase proportionally with higher laser power and the accumulated X-ray dose rates can cause serious health risks for the laser operators. On the other hand, there is clear evidence that little variations of the operational conditions can considerably affect the spectral X-ray photon flux and X-ray emissions dose. In order to enhance the knowledge in this field, four ultrashort pulse laser systems for providing different complementary beam characteristics were employed in this study on laser-induced X-ray emissions, including peak intensities between 8 × 1012 W∙cm−2 < I0 < 5.2 × 1016 W∙cm−2, up to 72.2 W average laser power as well as burst/bi-burst processing mode. By the example of AISI 304 stainless steel, it was verified that X-ray emission dose rates as high as H˙′ (0.07) > 45 mSv h−1 can be produced when low-intensity ultrashort pulses irradiate at a small 1 µm intra-line pulse distance during laser beam scanning and megahertz pulse repetition frequencies. For burst and bi-burst pulses, the second intra-burst pulse was found to significantly enhance the X-ray emission potentially induced by laser pulse and plasma interaction.

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“…This gives an intensity which is slightly lower than 1 × 10 18 W/cm 2 . At such intensity, we used the equation T hot = κ(Iλ 2 ) α to estimate the temperature of the electrons, with κ being an experimental factor and α is a scaling factor which attributes the heating mechanism [38]. To set the factor κ, we used our experimentally measured value for the electron temperature of T hot = 0.46 MeV at the minimum focal spot position and the scaling of α = 0.35.…”

Section: Maximum Proton Energy (Mev)mentioning

confidence: 99%

Parametric Study of Proton Acceleration from Laser-Thin Foil Interaction

Almassarani

Meng

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et al. 2021

Plasma

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We experimentally investigated the accelerated proton beam characteristics such as maximum energy and number by varying the incident laser parameters. For this purpose, we varied the laser energy, focal spot size, polarization, and pulse duration. The proton spectra were recorded using a single-shot Thomson parabola spectrometer equipped with a microchannel plate and a high-resolution charge-coupled device with a wide detection range from a few tens of keV to several MeV. The outcome of the experimental findings is discussed in detail and compared to other theoretical works.

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Absorption of ultrashort intense lasers in laser–solid interactions

Cited by 25 publications

References 137 publications

Table-top laser-based proton acceleration in nanostructured targets

Table-top laser-based proton acceleration in nanostructured targets

Study on X-ray Emission Using Ultrashort Pulsed Lasers in Materials Processing

Parametric Study of Proton Acceleration from Laser-Thin Foil Interaction

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