Articoli di riviste: "Ultra High Intensity Laser"

1

DAIDO, Hiroyuki. "Ultra-Short Ultra-High Intensity Laser-Matter Interaction". Review of Laser Engineering 31, n. 11 (2003): 698–706. http://dx.doi.org/10.2184/lsj.31.698.

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ABDULRAHMAN, Hayder J., e Suzan B. MOHAMMED. "DEVELOPMENT OF ULTRA-SHORT HIGH INTENSITY LASERS FOR THE VISIBLE SPECTRA RANGE". Periódico Tchê Química 17, n. 35 (20 luglio 2020): 739–52. http://dx.doi.org/10.52571/ptq.v17.n35.2020.63_abdulrahman_pgs_739_752.pdf.

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Ultra-short laser pulses are particularly suitable for processing micro tools made of ultra-hard and dielectric materials. Ultra-short laser pulses provide a contact-free and precise fabrication of heat-sensitive materials such as visible spectra range. Visible spectra range has unique properties, which makes it an essential material in the tool, jewelry, and semiconductor industries. The processing of visible spectra range by ultra-short laser pulses is complex, as visible and near-infrared light is generally not absorbed. However, the intensity of ultra-short laser pulses is extremely high, so that the absorption scales nonlinearly with the intensity and, thus, visible or near-infrared light can be absorbed. The complexity also results from many partially interdependent process variables, such as the repetition rate, pulse overlap, track overlap, and scan speed. Excellent knowledge of the process is, therefore, essential for the production of micro tools. To make the laser processing accessible to a broader user field, the operator can be supported by a computer-aided design (CAD). The aim of this research was to the modeling of an ultra-short high-intensity laser for the visible spectra range in different environments of the angle of incidence, scanning speed, pulse, and track overlap. The experimental process included ultra-short pulsed laser processing of visible spectra range and surface analysis concerning modifications and ablation of the ultra-short laser. Ablation volumes were analyzed for single pulses, multi-pulses, and pockets. Pump-probe experiments reveal transient optical properties such as transmission or reflectivity. It was concluded that ultraviolet laser pulses are best suited to induce damage or modifications to visible spectra range surfaces. Additionally, shorter wavelengths have further advantages such as potentially longer Rayleigh lengths and smaller spot sizes.

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Najmudin, Z., M. Tatarakis, K. Krushelnick, E. L. Clark, V. Malka, J. Faure e A. E. Dangor. "Ultra-high-intensity laser propagation through underdense plasma". IEEE Transactions on Plasma Science 30, n. 1 (febbraio 2002): 44–45. http://dx.doi.org/10.1109/tps.2002.1003915.

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Borne, F., D. Delacroix, J. M. Gel, D. Mass e F. Amiranoff. "Radiation Protection for an Ultra-high Intensity Laser". Radiation Protection Dosimetry 102, n. 1 (1 settembre 2002): 61–70. http://dx.doi.org/10.1093/oxfordjournals.rpd.a006074.

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Li, Zerui. "Analysis of the Principles and Applications of Ultra-intensity and Ultrashort Laser". Highlights in Science, Engineering and Technology 76 (31 dicembre 2023): 441–49. http://dx.doi.org/10.54097/9s9fm882.

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With the development of laser technology, how to improve the output performance and peak power of lasers has become one of the hot directions of current research. This study analyzes the principles and applications of ultra-intensity and ultrashort pulse laser. It firstly outlines the development history of laser technology and the basic definition of ultra-intensity and ultrashort pulse laser. It also mentions the realization methods for generating ultra-intensity and ultrashort pulse lasers, such as mode-locked femtosecond oscillators and CPA-based femtosecond amplifiers. The paper describes the principles of CPA technique and emphasizes its importance in realizing high power ultrashort pulses. The paper discusses various applications of ultra-intensity and ultrashort pulsed laser and summarizes and discusses the major bottlenecks facing current and future ultra-intensity and ultrashort pulsed lasers and their possible solutions. The technical review in this paper aims to enhance the understanding of ultra-intensity and ultrashort pulsed laser and provide insights into the next phase of research exploration in ultra-intensity and ultrashort pulsed lasers.

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Trtica, M., B. Gaković, D. Maravić, D. Batani, T. Desai e R. Redaelli. "Surface Modification of Titanium by High Intensity Ultra-Short Nd:YAG Laser". Materials Science Forum 518 (luglio 2006): 167–72. http://dx.doi.org/10.4028/www.scientific.net/msf.518.167.

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The effects of an Nd:YAG laser interaction with titanium target using laser radiation at wavelengths 1.064 or 0.532 μm (40 picoseconds pulse duration) were studied. Modification of target surfaces at laser energy densities of 2.4 and 10.3 J/cm2 (λ1 laser= 1.064 μm) and 1.1 J/cm2 (λ2 laser= 0.532 μm) are reported in this article. Qualitatively, the titanium surface modification can be summarized as follows: (i) ablation of the titanium surface in the central zone of the irradiated area for both laser wavelengths; (ii) appearance of a hydrodynamic feature like resolidified droplets of the material (λ1 laser= 1.064 μm), as well as formation of the wave-like microstructures (λ2 laser= 0.532 μm); and (iii) appearance of plasma, in front of the target, with both laser wavelengths.

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Kiriyama, Hiromitsu, Alexander S. Pirozhkov, Mamiko Nishiuchi, Yuji Fukuda, Akito Sagisaka, Akira Kon, Yasuhiro Miyasaka et al. "Petawatt Femtosecond Laser Pulses from Titanium-Doped Sapphire Crystal". Crystals 10, n. 9 (3 settembre 2020): 783. http://dx.doi.org/10.3390/cryst10090783.

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Ultra-high intensity femtosecond lasers have now become excellent scientific tools for the study of extreme material states in small-scale laboratory settings. The invention of chirped-pulse amplification (CPA) combined with titanium-doped sapphire (Ti:sapphire) crystals have enabled realization of such lasers. The pursuit of ultra-high intensity science and applications is driving worldwide development of new capabilities. A petawatt (PW = 1015 W), femtosecond (fs = 10−15 s), repetitive (0.1 Hz), high beam quality J-KAREN-P (Japan Kansai Advanced Relativistic ENgineering Petawatt) Ti:sapphire CPA laser has been recently constructed and used for accelerating charged particles (ions and electrons) and generating coherent and incoherent ultra-short-pulse, high-energy photon (X-ray) radiation. Ultra-high intensities of 1022 W/cm2 with high temporal contrast of 10−12 and a minimal number of pre-pulses on target has been demonstrated with the J-KAREN-P laser. Here, worldwide ultra-high intensity laser development is summarized, the output performance and spatiotemporal quality improvement of the J-KAREN-P laser are described, and some experimental results are briefly introduced.

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BOURDIER, A., D. PATIN e E. LEFEBVRE. "Stochastic heating in ultra high intensity laser-plasma interaction". Laser and Particle Beams 25, n. 1 (28 febbraio 2007): 169–80. http://dx.doi.org/10.1017/s026303460707022x.

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Stochastic instabilities are studied considering the motion of one particle in a very high intensity wave propagating along a constant homogeneous magnetic field, and in a high intensity wave propagating in a nonmagnetized medium perturbed by one or two low intensity traveling waves. Resonances are identified and conditions for resonance overlap are studied. The part of chaos in the electron acceleration is analyzed. PIC code simulation results confirm the stochastic heating.

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Chériaux, Gilles, e Jean-Paul Chambaret. "Ultra-short high-intensity laser pulse generation and amplification". Measurement Science and Technology 12, n. 11 (9 ottobre 2001): 1769–76. http://dx.doi.org/10.1088/0957-0233/12/11/303.

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Chériaux, Gilles, e Jean-Paul Chambaret. "Ultra-short high-intensity laser pulse generation and amplification". Measurement Science and Technology 19, n. 12 (4 novembre 2008): 129801. http://dx.doi.org/10.1088/0957-0233/19/12/129801.

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Bourdier, A., D. Patin e E. Lefebvre. "Stochastic heating in ultra high intensity laser-plasma interaction". Physica D: Nonlinear Phenomena 206, n. 1-2 (giugno 2005): 1–31. http://dx.doi.org/10.1016/j.physd.2005.04.017.

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PATIN, D., A. BOURDIER e E. LEFEBVRE. "Stochastic heating in ultra high intensity laser-plasma interaction". Laser and Particle Beams 23, n. 4 (ottobre 2005): 599. http://dx.doi.org/10.1017/s0263034605059987.

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13

Budrigă, O., e E. D'Humières. "Modeling the ultra-high intensity laser pulse – cone target interaction for ion acceleration at CETAL facility". Laser and Particle Beams 35, n. 3 (10 luglio 2017): 458–66. http://dx.doi.org/10.1017/s0263034617000349.

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AbstractWe study the interaction of an ultra-high intensity laser pulse with plastic flat-top cone targets with curved walls and cone targets with straight walls. We find the appropriate type, dimensions of the cone target, and the ultra-high intensity laser pulse parameters for which the accelerated ions have the maximum energy and their number is the highest for a lower angular divergence and a better laser absorption. This numerical study will allow one to prepare and optimize first laser-ion acceleration experiments on CETAL using micro-cone targets.

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Antonucci, L., J. P. Rousseau, A. Jullien, B. Mercier, V. Laude e G. Cheriaux. "14-fs high temporal quality injector for ultra-high intensity laser". Optics Communications 282, n. 7 (aprile 2009): 1374–79. http://dx.doi.org/10.1016/j.optcom.2008.12.031.

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Manclossi, M., A. Guemnie-Tafo, D. Batani, V. Malka, S. Fritzler, E. Lefebvre e E. D'Humières. "Proton beam generation by ultra-high intensity laser–solid interaction". Radiation Effects and Defects in Solids 160, n. 10-12 (ottobre 2005): 631–37. http://dx.doi.org/10.1080/10420150500493139.

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Melikian, Robert. "Acceleration of electrons by high intensity laser radiation in a magnetic field". Laser and Particle Beams 32, n. 2 (14 febbraio 2014): 205–10. http://dx.doi.org/10.1017/s026303461300092x.

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AbstractWe consider the acceleration of electrons in vacuum by means of the circularly-polirized electromagnetic wave, propagating along a magnetic field. We show that the electron energy growth, when using ultra-short and ultra-intense laser pulses (1 ps, 1018 W/cm2, CO2 laser) in the presence of a magnetic field, may reach up to the value 2,1 GeV. The growth of the electron energy is shown to increase proportionally with the increase of the laser intensity and the initial energy of the electron. We find that for some direction of polarization of the wave, the acceleration of electrons does not depend on the initial phase of the electromagnetic wave. We estimate the laser intensity, necessary for the electron acceleration. In addition, we find the formation length of photon absorption by electrons, due to which one may choose the required region of the interaction of the electrons with the electromagnetic wave and magnetic field. We also show that as a result of acceleration of electrons in the vacuum by laser radiation in a magnetic field one may obtain electron beam with small energy spread of the order δε/ε ≤ 10−2.

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Prasad, R., A. A. Andreev, S. Ter-Avetisyan, D. Doria, K. E. Quinn, L. Romagnani, C. M. Brenner et al. "Fast ion acceleration from thin foils irradiated by ultra-high intensity, ultra-high contrast laser pulses". Applied Physics Letters 99, n. 12 (19 settembre 2011): 121504. http://dx.doi.org/10.1063/1.3643133.

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Kieffer, J. C., C. Y. Côté, Z. Jiang, Y. Beaudoin, M. Chaker e O. Peyrusse. "Towards hot solid-density plasmas with ultra-high-intensity sub-picosecond lasers". Canadian Journal of Physics 72, n. 11-12 (1 novembre 1994): 802–7. http://dx.doi.org/10.1139/p94-105.

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We discuss the various regimes of interaction of a sub-picosecond laser pulse with solid matter that we are exploring with the table top terawatt laser system at the Institut national de la recherche scientifique. The Li-like satellite spectrum (1s2l2l′-1s22l) is used to study (i) the nonstationary and non-Maxwellian physics when the density gradient scale length is large compared with the laser wavelength, and (ii) the transition towards the physics of solid-density plasmas at the local thermodynamical equilibrium when the gradient scale length is ultrashort. We emphasize some exciting perspectives of this new physics and in particular we discuss the generation of hot solid-density plasmas that may have a strong impact in many different areas such as astrophysics, atomic physics, chemistry, and inertial confinement fusion.

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Zheng, Nan, Ričardas Buividas, Hsin-Hui Huang, Dominyka Stonytė, Suresh Palanisamy, Tomas Katkus, Maciej Kretkowski, Paul R. Stoddart e Saulius Juodkazis. "Laser Machining at High ∼PW/cm2 Intensity and High Throughput". Photonics 11, n. 7 (26 giugno 2024): 598. http://dx.doi.org/10.3390/photonics11070598.

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Laser machining by ultra-short (sub-ps) pulses at high intensity offers high precision, high throughput in terms of area or volume per unit time, and flexibility to adapt processing protocols to different materials on the same workpiece. Here, we consider the challenge of optimization for high throughput: how to use the maximum available laser power and larger focal spots for larger ablation volumes by implementing a fast scan. This implies the use of high-intensity pulses approaching ∼PW/cm2 at the threshold where tunneling ionization starts to contribute to overall ionization. A custom laser micromachining setup was developed and built to enable high speed, large-area processing, and easy system reconfiguration for different tasks. The main components include the laser, stages, scanners, control system, and software. Machining of metals such as Cu, Al, or stainless steel and fused silica surfaces at high fluence and high exposure doses at high scan speeds up to 3 m/s were tested for the fluence scaling of ablation volume, which was found to be linear. The largest material removal rate was 10 mm3/min for Cu and 20 mm3/min for Al at the maximum power 80 W (25 J/cm2 per pulse). Modified surfaces are color-classified for their appearance, which is dependent on surface roughness and chemical modification. Such color-coding can be used as a feedback parameter for industrial process control.

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BORGHESI, M., S. KAR, L. ROMAGNANI, T. TONCIAN, P. ANTICI, P. AUDEBERT, E. BRAMBRINK et al. "Impulsive electric fields driven by high-intensity laser matter interactions". Laser and Particle Beams 25, n. 1 (28 febbraio 2007): 161–67. http://dx.doi.org/10.1017/s0263034607070218.

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The interaction of high-intensity laser pulses with matter releases instantaneously ultra-large currents of highly energetic electrons, leading to the generation of highly-transient, large-amplitude electric and magnetic fields. We report results of recent experiments in which such charge dynamics have been studied by using proton probing techniques able to provide maps of the electrostatic fields with high spatial and temporal resolution. The dynamics of ponderomotive channeling in underdense plasmas have been studied in this way, as also the processes of Debye sheath formation and MeV ion front expansion at the rear of laser-irradiated thin metallic foils. Laser-driven impulsive fields at the surface of solid targets can be applied for energy-selective ion beam focusing.

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Domański, J., J. Badziak e M. Marchwiany. "Laser-driven acceleration of heavy ions at ultra-relativistic laser intensity". Laser and Particle Beams 36, n. 4 (dicembre 2018): 507–12. http://dx.doi.org/10.1017/s0263034618000563.

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AbstractThis paper presents the results of numerical investigations into the acceleration of heavy ions by a multi-PW laser pulse of ultra-relativistic intensity, to be available with the Extreme Light Infrastructure lasers currently being built in Europe. In the numerical simulations, performed with the use of a multi-dimensional (2D3V) particle-in-cell code, the thorium target with a thickness of 50 or 200 nm was irradiated by a circularly polarized 20 fs laser pulse with an energy of ~150 J and an intensity of 1023 W/cm2. It was found that the detailed run of the ion acceleration process depends on the target thickness, though in both considered cases the radiation pressure acceleration (RPA) stage of ion acceleration is followed by a sheath acceleration stage, with a significant role in the post-RPA stage being played by the ballistic movement of ions. This hybrid acceleration mechanism leads to the production of an ultra-short (sub-picosecond) multi-GeV ion beam with a wide energy spectrum and an extremely high intensity (>1021 W/cm2) and ion fluence (>1017 cm−2). Heavy ion beams of such extreme parameters are hardly achievable in conventional RF-driven ion accelerators, so they could open the avenues to new areas of research in nuclear and high energy density physics, and possibly in other scientific domains.

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McKenna, Paul, Filip Lindau, Olle Lundh, David Neely, Anders Persson e Claes-Göran Wahlström. "High-intensity laser-driven proton acceleration: influence of pulse contrast". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 364, n. 1840 (25 gennaio 2006): 711–23. http://dx.doi.org/10.1098/rsta.2005.1733.

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Proton acceleration from the interaction of ultra-short laser pulses with thin foil targets at intensities greater than 10 18 W cm −2 is discussed. An overview of the physical processes giving rise to the generation of protons with multi-MeV energies, in well defined beams with excellent spatial quality, is presented. Specifically, the discussion centres on the influence of laser pulse contrast on the spatial and energy distributions of accelerated proton beams. Results from an ongoing experimental investigation of proton acceleration using the 10 Hz multi-terawatt Ti : sapphire laser (35 fs, 35 TW) at the Lund Laser Centre are discussed. It is demonstrated that a window of amplified spontaneous emission (ASE) conditions exist, for which the direction of proton emission is sensitive to the ASE-pedestal preceding the peak of the laser pulse, and that by significantly improving the temporal contrast, using plasma mirrors, efficient proton acceleration is observed from target foils with thickness less than 50 nm.

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Badziak, J., e J. Domański. "Towards ultra-intense ultra-short ion beams driven by a multi-PW laser". Laser and Particle Beams 37, n. 03 (26 luglio 2019): 288–300. http://dx.doi.org/10.1017/s0263034619000533.

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AbstractThe multi-petawatt (PW) lasers currently being built in Europe as part of the Extreme Light Infrastructure (ELI) project will be capable of generating femtosecond light pulses of ultra-relativistic intensities (~1023–1024 W/cm2) that have been unattainable so far. Such laser pulses can be used for the production of high-energy ion beams with unique features that could be applied in various fields of scientific and technological research. In this paper, the prospect of producing ultra-intense (intensity ≥1020 W/cm2) ultra-short (pico- or femtosecond) high-energy ion beams using multi-PW lasers is outlined. The results of numerical studies on the acceleration of light (carbon) ions, medium-heavy (copper) ions and super-heavy (lead) ions driven by a femtosecond laser pulse of ultra-relativistic intensity, performed with the use of a multi-dimensional (2D3 V) particle-in-cell code, are presented, and the ion acceleration mechanisms and properties of the generated ion beams are discussed. It is shown that both in the case of light ions and in the case of medium-heavy and super-heavy ions, ultra-intense femtosecond multi-GeV ion beams with a beam intensity much higher (by a factor ~102) and ion pulse durations much shorter (by a factor ~104–105) than achievable presently in conventional radio frequency-driven accelerators can be produced at laser intensities of 1023 W/cm2 predicted for the ELI lasers. Such ion beams can open the door to new areas of research in high-energy density physics, nuclear physics and inertial confinement fusion.

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Bulanov, S. S., A. Maksimchuk, K. Krushelnick, K. I. Popov, V. Yu Bychenkov e W. Rozmus. "Ensemble of ultra-high intensity attosecond pulses from laser–plasma interaction". Physics Letters A 374, n. 3 (gennaio 2010): 476–80. http://dx.doi.org/10.1016/j.physleta.2009.11.009.

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Bulanov, S. S., V. Y. U. Bychenkov, K. Krushelnick, A. Maksimchuk, K. I. Popov e W. Rozmus. "Swarm of ultra-high intensity attosecond pulses from laser-plasma interaction". Journal of Physics: Conference Series 244, n. 2 (1 agosto 2010): 022029. http://dx.doi.org/10.1088/1742-6596/244/2/022029.

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Maksimchuk, A., S. S. Bulanov, A. Brantov, V. Yu Bychenkov, V. Chvykov, F. Dollar, D. Litzenberg et al. "Control of proton energy in ultra-high intensity laser-matter interaction". Journal of Physics: Conference Series 244, n. 4 (1 agosto 2010): 042025. http://dx.doi.org/10.1088/1742-6596/244/4/042025.

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Yanovsky, V., V. Chvykov, G. Kalinchenko, P. Rousseau, T. Planchon, T. Matsuoka, A. Maksimchuk et al. "Ultra-high intensity- 300-TW laser at 0.1 Hz repetition rate". Optics Express 16, n. 3 (2008): 2109. http://dx.doi.org/10.1364/oe.16.002109.

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Varin, C., e M. Piché. "Acceleration of ultra-relativistic electrons using high-intensity TM01 laser beams". Applied Physics B 74, S1 (giugno 2002): s83—s88. http://dx.doi.org/10.1007/s00340-002-0906-8.

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Kando, Masaki, Alexander S. Pirozhkov, James K. Koga, Timur Zh Esirkepov e Sergei V. Bulanov. "Prospects of Relativistic Flying Mirrors for Ultra-High-Field Science". Photonics 9, n. 11 (15 novembre 2022): 862. http://dx.doi.org/10.3390/photonics9110862.

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Recent progress of high-peak-power lasers makes researchers envisage ultra-high-field science; however, the current or near future facilities will not be strong enough to reach the vacuum breakdown intensity, i.e., the Schwinger field. To address this difficulty, a relativistic flying mirror (RFM) technology is proposed to boost the focused intensity by double the Doppler effect of an incoming laser pulse. We review the principle, theoretical, and experimental progress of the RFM, as well as its prospects.

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Zhou, Chuliang, Ye Tian, Yushan Zeng, Zhinan Zeng e Ruxin Li. "Bright High-Harmonic Generation through Coherent Synchrotron Emission Based on the Polarization Gating Scheme". Laser and Particle Beams 2022 (14 febbraio 2022): 1–10. http://dx.doi.org/10.1155/2022/6948110.

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Relativistic surface high harmonics, combined with the use of polarization gating, present a promising route towards intense single attosecond pulses. However, they impose stringent requirements on ultra-high laser contrast and are restricted by large intensity losses in real experiments. Here, we numerically demonstrate that by setting an optimal time delay in the polarization gating scheme, the intensity of the generated single attosecond pulses can become approximately 100 times stronger than that with nonoptimal time delay in the coherent synchrotron emission process. When a petawatt-class driving laser irradiates a solid target, an ultra-dense electron nanobunch and a strong space-charge sheath develop, and the accumulated electrostatic energy is only released in half of the laser cycle when this electron nanobunch moves backward. This process results in the emission of intense high harmonics. Our study provides a reliable method for developing bright attosecond extreme ultraviolet pulses.

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HEINZL, THOMAS. "STRONG-FIELD QED AND HIGH POWER LASERS". International Journal of Modern Physics: Conference Series 14 (gennaio 2012): 127–40. http://dx.doi.org/10.1142/s2010194512007283.

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This contribution presents an overview of fundamental QED processes in the presence of an external field produced by an ultra-intense laser. The discussion focusses on the basic intensity effects on vacuum polarisation and the prospects for their observation. Some historical remarks are added where appropriate.

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HEINZL, THOMAS. "STRONG-FIELD QED AND HIGH-POWER LASERS". International Journal of Modern Physics A 27, n. 15 (14 giugno 2012): 1260010. http://dx.doi.org/10.1142/s0217751x1260010x.

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This contribution presents an overview of fundamental QED processes in the presence of an external field produced by an ultra-intense laser. The discussion focusses on the basic intensity effects on vacuum polarisation and the prospects for their observation. Some historical remarks are added where appropriate.

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BATANI, DIMITRI. "Transport in dense matter of relativistic electrons produced in ultra-high-intensity laser interactions". Laser and Particle Beams 20, n. 2 (aprile 2002): 321–36. http://dx.doi.org/10.1017/s0263034602202244.

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The paper reviews and analyses the experiments devoted to the propagation in dense matter of fast electrons produced in the interaction of short-pulse ultra-high-intensity laser pulses with solid density targets.

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Batani, D., S. Baton, M. Koenig, P. Guillou, B. Loupias, T. Vinci, C. Rousseaux et al. "Recent experiment on fast electron transport in ultra-high intensity laser interaction". Journal of Physics: Conference Series 112, n. 2 (1 maggio 2008): 022048. http://dx.doi.org/10.1088/1742-6596/112/2/022048.

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SAKABE, Shuji. "Table-Top Ultra-Short High-Intensity Pulse Lasers." Review of Laser Engineering 25, n. 12 (1997): 855–63. http://dx.doi.org/10.2184/lsj.25.855.

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SAKABE, Shuji, e Sadao NAKAI. "Fundamentals of Lasers. III: Ultra-Short High-Intensity Lasers." Review of Laser Engineering 26, n. 11 (1998): 823–27. http://dx.doi.org/10.2184/lsj.26.823.

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Li, He. "The laser matter interaction in the QED regime". Highlights in Science, Engineering and Technology 5 (7 luglio 2022): 188–93. http://dx.doi.org/10.54097/hset.v5i.741.

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Contemporarily, with the rapid development of the laser techniques, the peak intensity of the laser reaches 1023 W/cm2. In this case, the laser plasma interaction enters the QED regime. With this in mind, this research demonstrates the state-of-art simulations results in the frame. Specifically, a brief introduction to the QED effect is introduced primarily. Subsequent, the progress of ultra-intensity laser, and the state-of-art facilities are discussed. Afterwards, the theoretical description of Compton scattering and Electron-Positron pairs generation are discussed. Eventually, application of high intensity gamma ray and EP pairs are presented. These results shed light on guiding further exploration of the QED physics.

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HU, QIANG-LIN, GUI-LAN XIAO e XIAO-GUANG YU. "Modulational instability of an ultra-intense laser pulse in electron–positron plasmas". Journal of Plasma Physics 79, n. 5 (3 maggio 2013): 771–76. http://dx.doi.org/10.1017/s0022377813000482.

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AbstractThis paper investigates the modulational instability of a linearly polarized ultra-intense laser pulse propagating in electron–positron plasmas. Based on the wave equation, which contains vacuum polarization and magnetization effects, the nonlinear dispersion relation and the growth rate of instability are obtained and the effects of plasma number density and laser intensity on the growth rate are analyzed. Numerical results show that if the laser intensity is high enough, the modulational instability growth rate induced by vacuum polarization and magnetization nonlinearity can dominate the modulational instability growth rate induced by the nonlinearity associated with a relativistic effect and ponderomotive force.

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39

Purohit, Gunjan, Priyanka Rawat, Pradeep Kothiyal e Ramesh Kumar Sharma. "Relativistic longitudinal self-compression of ultra-intense Gaussian laser pulses in magnetized plasma". Laser and Particle Beams 38, n. 3 (19 agosto 2020): 188–96. http://dx.doi.org/10.1017/s0263034620000245.

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AbstractThis article presents a preliminary study of the longitudinal self-compression of ultra-intense Gaussian laser pulse in a magnetized plasma, when relativistic nonlinearity is active. This study has been carried out in 1D geometry under a nonlinear Schrodinger equation and higher-order paraxial (nonparaxial) approximation. The nonlinear differential equations for self-compression and self-focusing have been derived and solved by the analytical and numerical methods. The dielectric function and the eikonal have been expanded up to the fourth power of r (radial distance). The effect of initial parameters, namely incident laser intensity, magnetic field, and initial pulse duration on the compression of a relativistic Gaussian laser pulse have been explored. The results are compared with paraxial-ray approximation. It is found that the compression of pulse and pulse intensity of the compressed pulse is significantly enhanced in the nonparaxial region. It is observed that the compression of the high-intensity laser pulse depends on the intensity of laser beam (a0), magnetic field (ωc), and initial pulse width (τ0). The preliminary results show that the pulse is more compressed by increasing the values of a0, ωc, and τ0.

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40

Jain, Vineeta, K. P. Maheshwari, N. K. Jaiman e Harish Malav. "Non-linear interaction of ultra-intense ultra-short laser pulse with a relativistic flying double-sided dense plasma slab/mirror". Laser and Particle Beams 32, n. 2 (24 febbraio 2014): 253–60. http://dx.doi.org/10.1017/s0263034614000068.

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AbstractAnalytical and numerical investigation of the reflection and transmission of a counter-propagating relativistically strong laser pulse from a relativistically flying dense plasma double-sided mirror is studied. We assume that the incident laser pulse is short, so that we can neglect the slow ion dynamics and consider the electron motion only. Numerical results of the amplitudes of the reflected/transmitted electric fields from a uniformly moving mirror, accelerated mirror, and oscillating mirror are obtained. Fourier spectrum of the reflected intensity from the moving mirror shows that the intensity decreases with increase in the frequency. The reflected pulse has an up-shifted frequency and increased intensity. It is seen that the first few cycles of the reflected radiation exhibit presence of high harmonics, while the later cycles are compressed together with harmonics in comparison with the earlier cycles. The variation of the reflection coefficient for a uniformly moving mirror as a function of the thin foil plasma-density parameter is numerically studied.

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41

Vladisavlevici, Iuliana-Mariana, Daniel Vizman e Emmanuel d’Humières. "Laser Driven Electron Acceleration from Near-Critical Density Targets towards the Generation of High Energy γ-Photons". Photonics 9, n. 12 (9 dicembre 2022): 953. http://dx.doi.org/10.3390/photonics9120953.

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In this paper, we investigate the production of high energy gamma photons at the interaction between an ultra-high intensity laser pulse with an energetic electron beam and with a near-critical density plasma for the laser intensity varying between 1019–1023 W/cm2. In the case of the interaction with an electron beam, and for the highest laser intensities considered, the electrons lose almost all their energy to emit gamma photons. In the interaction with a near-critical density plasma, the electrons are first accelerated by the laser pulse up to GeV energies and further emit high energy radiation. A maximum laser-to-photons conversion coefficient of 30% is obtained. These results can be used for the preparation of experiments at the Apollon and ELI laser facilities for the investigation of the emission of high energy γ-photons and to study the electron-positron pair creation in the laboratory.

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42

KON, Akira, Motoaki NAKATSUTSUMI, Julien FUCHS, Sebastien BUFFECHOUX, Patrick AUDEBERT, Zheng Lin CHEN, Yuichi INUBUSHI, Jin ZHAN e Ryosuke KODAMA. "High Numerical Aperture (N. A.) Focusing of Ultra-High Intensity Laser with Ellipsoidal Plasma Mirror". Review of Laser Engineering 38, n. 10 (2010): 784–88. http://dx.doi.org/10.2184/lsj.38.784.

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43

WANG, NAIYAN, YUSHENG SHAN, WEIYI MA, DAWEI YANG, GONG KUN, XIAOJUN WANG, XIUZHANG TANG, YEZHENG TAO, JINGLONG MA e XINGDONG JIANG. "Activities of developing high-power KrF lasers and studying laser plasmas interaction physics at CIAE". Laser and Particle Beams 20, n. 1 (gennaio 2002): 119–22. http://dx.doi.org/10.1017/s0263034602201172.

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This report reviews the scientific activities on high power laser and laser plasma physics at CIAE. A 6-beam KrF excimer laser system (100 J/23 ns/248 nm/1013 W/cm2, 15 min/shot) has been built, the Raman technologies used to upgrade it to 1014 W/cm2 has been studied. A UV femtosecond Ti:sapphire/KrF hybrid laser (50 mJ/220 fs/248 nm/1017 W/cm2) has been developed also, hot electron generation research has been carried out in the fs laser. In the near future, the fs laser will be amplified in six-beam laser system to produce ultra-high intensity to do fundamental researches on Fast Ignition of ICF.

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44

Jeong, Jihoon, Seryeyohan Cho, Seungjin Hwang, Bongju Lee e Tae Jun Yu. "Modeling and Analysis of High-Power Ti:sapphire Laser Amplifiers–A Review". Applied Sciences 9, n. 12 (12 giugno 2019): 2396. http://dx.doi.org/10.3390/app9122396.

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We have introduced several factors that can be useful for the modeling and analysis of high-power Ti:sapphire laser amplifiers. The amplification model includes the phase distortion effect caused by the atomic phase shift (APS) in gain medium and the thermal-induced phase distortion effect caused by the high-average-power amplification. We have provided an accurate amplification model for the development of ultra-high-intensity and high-average-power lasers.

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45

Martiş, M., O. Budrigă, E. d’Humières, L. E. Ionel e M. Carabaş. "Modeling the interaction of an ultra-high intensity laser pulse with an ultra-thin nanostructured foil target". Plasma Physics and Controlled Fusion 62, n. 9 (4 agosto 2020): 095014. http://dx.doi.org/10.1088/1361-6587/aba179.

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46

LIU JIAN-SHENG, LI RU-XIN, ZHU PIN-PIN, XU ZHI-ZHAN e LIU JING-RU. "DYNAMICS OF LARGE-SIZE ATOMIC CLUSTERS IN ULTRA-SHORT HIGH-INTENSITY LASER PULSES". Acta Physica Sinica 50, n. 6 (2001): 1121. http://dx.doi.org/10.7498/aps.50.1121.

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47

CHIRILĂ, C. C., C. J. JOACHAIN, N. J. KYLSTRA e R. M. POTVLIEGE. "Interaction of ultra-intense laser pulses with relativistic ions". Laser and Particle Beams 22, n. 3 (luglio 2004): 203–6. http://dx.doi.org/10.1017/s0263034604223023.

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At high laser intensities, three step recollision processes such as high order harmonic generation and high-order ATI, are normally severely suppressed due to the magnetic field component of the laser pulse. However, if the laser pulse and relativistic ion beam are directed against each other, a significant increase in the frequency and the intensity of the pulse in the rest frame of the ions can occur. By performing calculations based on a Coulomb-corrected nondipole strong field approximation, we have shown that there is a range of intensities, Lorentz factors, and ion charges for which the suppression of the three step recollision processes is not severe, even for ponderomotive energies exceeding 10 keV. As an example, we consider parameters relevant to the accelerator that will be built at GSI-Darmstadt, capable of accelerating multicharged ions to Lorentz factors reaching 30.

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48

Trtica, M., J. Limpouch, P. Gavrilov, P. Hribek, J. Stasic, G. Brankovic e X. Chen. "Surface modification of ASP 30 steel induced by femtosecond laser with 1014 and 1013 W/cm2 intensity in vacuum". Laser and Particle Beams 35, n. 3 (18 agosto 2017): 534–42. http://dx.doi.org/10.1017/s0263034617000337.

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AbstractA study of ASP 30 steel surface modification with high intensity Ti:sapphire laser, operating at 804 nm wavelength and pulse duration of 60 fs, in vacuum ambient, is presented. ASP 30 steel surface variations were studied at laser intensities of 1014 and 1013 W/cm2. The steel target specific surface changes and phenomena observed are: (i) Creation of craters at 1014 W/cm2 intensity; (ii) formation of periodic surface structures only at the reduced intensity of 1013 W/cm2; (iii) chemical surface changes registered only at higher laser intensity, and (iv) occurrence of plasma in front of the surface, including its emission in X-ray region. It can be concluded from this study that the reported laser intensities can effectively be applied for ASP 30 steel surface modification. Careful choosing of laser intensity and pulse count can lead to precise superficial material removal, for example laser intensity ~1013 W/cm2 and low pulse count can lead to ultra-precise surface processing. Generally, femtosecond laser surface modification of ASP 30 steel is non-contact and very rapid compared with traditional modification methods.

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49

Zeraouli, G., D. Mariscal, E. Grace, G. G. Scott, K. K. Swanson, R. Simpson, B. Z. Djordjevic et al. "Ultra-compact x-ray spectrometer for high-repetition-rate laser–plasma experiments". Review of Scientific Instruments 93, n. 11 (1 novembre 2022): 113508. http://dx.doi.org/10.1063/5.0100970.

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We present in this work the development of an ultra-compact, multi-channel x-ray spectrometer (UCXS). This diagnostic has been specially built and adapted to perform at high-repetition-rate (>1 Hz) for high-intensity, short-pulse laser plasma experiments. X-ray filters of varying materials and thicknesses are chosen to provide spectral resolution up to Δ E ≈ 1 keV over the x-ray energy range of 1–30 keV. These filters are distributed over a total of 25 channels, where each x-ray filter is coupled to a single scintillator. The UCXS is designed to detect and resolve a large variety of laser-driven x-ray sources such as low energy bremsstrahlung emission, fluorescence, and betatron radiation (up to 30 keV). Preliminary results from commissioning experiments at the ABL laser facility at Colorado State University are provided.

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50

OGINO, Jumpei, Shigeki TOKITA, Hidetsugu YOSHIDA, Keiko MATSUMOTO, Koji TSUBAKIMOTO, Kana FUJIOKA, Noboru MORIO, Shinji MOTOKOSHI, Ryosuke KODAMA e Junji KAWANAKA. "Prospects for High Repetition Rate Ultrashort Pulsed Ultra-High Intensity Lasers −Development of High Repetition Rate and High Pulse Energy Laser−". Review of Laser Engineering 50, n. 7 (2022): 377. http://dx.doi.org/10.2184/lsj.50.7_377.

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