- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Coarse Grained Simulation and Turbulent Mixing || Laser Driven Turbulence in High Energy Density Physics and Inertial Confinement Fusion Experiments
摘要： The mixing of initially separate materials in a turbulent ?ow by the small scales of turbulent motion is a critical and often poorly understood element of many research programs, such as inertial con?nement fusion (ICF), supernova implosions and explosions, and combustion, as well as many other applications in engineering, geophysics, and astrophysics. In typical contexts of interest, we are interested in achieving detailed understanding of interpenetration, hydrodynamical instabilities, and mixing arising from perturbations at the material interfaces, that is, driven by Rayleigh–Taylor (RT), Richtmyer–Meshkov (RM), and Kelvin–Helmholtz (KH) instabilities (buoyancy, shock, and shear induced instabilities, respectively). Laboratory observations typically provide only limited integrated measures of complex nonlinear three-dimensional physical processes, leaving many details and mechanisms unresolved. Carefully controlled computational experiments based on the numerical simulations play a crucial complementary role, providing insight into the underlying dynamics. Collaborative laboratory/computational studies are used to establish predictability of the models in conjunction with the development of frameworks for analysis, metrics for veri?cation and validation, and uncertainty quanti?cation.
关键词： Richtmyer–Meshkov instability,Rayleigh–Taylor instability,inertial con?nement fusion,turbulent mixing,high energy density physics,Kelvin–Helmholtz instability
更新于2025-09-12 10:27:22
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High-Energy-Density Physics and Laser Technologies
摘要： This paper is devoted to the jubilee of I.M. Khalatnikov, the founder and the first director of the Landau Institute for Theoretical Physics of the Russian Academy of Sciences. I.M. Khalatnikov organized a first-class institute the studies at which cover a broad spectrum of research directions. The plasma and lasers department of the Institute conducts research on plasma physics problems, laser–matter interaction, questions pertaining to laser applications, and hydrodynamics problems. Much attention is given to solid-state physics with an emphasis on the behavior of matter in extreme conditions under intense laser irradiation. A number of new results are presented: the behavior of metals in two-temperature states (when the temperature of the electron subsystem of a metal is much greater than the temperature of the ion subsystem due to ultrafast laser heating); determining the boundaries of existence of a single-wave propagation mode of elastoplastic shock waves in ductile metal crystals; the formation of a laser torch from target materials and liquids under metal laser ablation of a metal into the surrounding liquid; the physical–mechanical consequences (melting, capillarity, recrystallization) of nonuniform (along the irradiated surface) energy dissipation caused by the interference of plasmon–polariton and laser electromagnetic fields.
关键词： laser–matter interaction,plasma physics,laser ablation,hydrodynamics,two-temperature states,plasmon–polariton,solid-state physics,high-energy-density physics,laser technologies,elastoplastic shock waves
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - High-Power Ultrafast Industrial Thin-Disk Lasers
摘要： Ultrafast amplifiers using industrial thin-disk technology from TRUMPF deliver record pulse energies of 200 mJ at 5 kHz. In addition, multipass amplifiers to increase the average power and pulse energy and concepts for nonlinear compression to reach pulse durations below 50 fs will be discussed.
关键词： diode-pumped,ultrafast,high-energy,Thin-disk laser,amplification,high-power,laser amplifier,X-ray
更新于2025-09-11 14:15:04
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Multiple colliding laser pulses as a basis for studying high-field high-energy physics
摘要： Apart from maximizing the strength of optical electromagnetic fields achievable at high-intensity laser facilities, the collision of several phase-matched laser pulses has been identified theoretically as a trigger of and way to study various phenomena. These range from the basic processes of strong-field quantum electrodynamics to the extraordinary dynamics of the generated electron-positron plasmas. This has paved the way for several experimental proposals aimed at both fundamental studies of matter at extreme conditions and the creation of particle and radiation sources. Because of the unprecedented capabilities of such sources, they have the potential to open up new opportunities for experimental studies in nuclear and quark-gluon physics. We perform here a systematic analysis of different regimes and opportunities achievable with the concept of multiple colliding laser pulses, for both current and upcoming laser facilities. We reveal that several distinct regimes could be within reach of multi-petawatt laser facilities.
关键词： high-field high-energy physics,quantum electrodynamics,multiple colliding laser pulses,electron-positron plasmas,particle and radiation sources
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE International Symposium on Circuits and Systems (ISCAS) - Florence, Italy (2018.5.27-2018.5.30)] 2018 IEEE International Symposium on Circuits and Systems (ISCAS) - Design of a radiation-tolerant high-speed driver for Mach Zender Modulators in High Energy Physics
摘要： This paper presents the integrated circuit design, targeting a CMOS 65 nm 1.2 V technology, of a high-speed driver that provides the differential input signals to a Mach Zender Modulator (MZM), and allows tuning of the MZM operating point through adjustment of the bias voltage. A multi-voltage isolated domain circuit through deep n-well trenches, to face the high voltage swing and the bias regulation requirements of the MZM. The MZM device, whose prototype has been implemented in silicon photonics iSiPP50G technology, is emerging as a promising solution for radiation tolerant, several hundreds of Mrad, and high-speed, in the range of 10 Gbps, optical links. These stringent requirements are needed in high energy physics experiments in the upgrade of the Large Hadron Collider or in future Linear Colliders.
关键词： High-speed CMOS driver,Mach-Zender Modulator driving circuit,Radiation tolerance,High energy physics
更新于2025-09-11 14:15:04
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Seamless multistage laser-plasma acceleration toward future high-energy colliders
摘要： Multistage laser wakefield accelerators that are coupled with variable-curvature plasma channels make it possible to efficiently accelerate electrons to high energies that exceed dephasing and pump depletion limits. Seamless coupling between laser and particle beams may envisage future energy-frontier colliders of revolutionarily small size and cost.
关键词： high-energy colliders,electron acceleration,plasma channels,laser wakefield accelerators
更新于2025-09-11 14:15:04
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All-Fiber Saturable Absorbers for Ultrafast Fiber Lasers
摘要： The past decade has witnessed tremendous achievements of ultrafast ?ber laser technologies due to rapid developments of saturable absorbers (SAs) based on, in particular, nanomaterials such as 0D quantum dot, 1D carbon nanotubes, 2D layered materials, and 3D nanostructures. However, most of those nanomaterials-based SAs are inevitably absence of the high damage threshold and all-?ber integration, therefore challenging their applications on highly integrated and high-energy pulse generations. Recently, the real all-?ber SAs based on the nonlinear multimodal interference (NLMMI) technique using multimode ?bers are demonstrated to overcome the above limitations. In this review, a detailed summary of the recent advances in NLMMI-based all-?ber SAs is provided, including the fundamental theory, implementation scenarios, and ultrafast ?ber lasers of the all-?ber SAs, covering wide wavelength range of 1, 1.55, and 2 μm. In addition to the state-of-the-art overview, optical rogue waves in the all-?ber SA-based ultrafast ?ber laser are extensively analyzed, which reveals the laser physics behind the dynamics from low-energy to high-energy pulses and directs the design of high-energy ultrafast ?ber lasers. The conclusions and perspectives of the all-?ber SAs are also discussed at the end.
关键词： nonlinear multimode interference effect,high-energy pulse generation,saturable absorber,Ultrafast ?ber laser,optical rogue wave
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - High Energy Dissipative Soliton Resonance in a Thulium-Doped Fiber Laser at 1750 nm
摘要： In recent years, the popular thulium-doped fiber lasers (TDFL) are expanding their operational wavelength coverage through accessing the 1.7-μm region, where they have previously been hindered by the quasi-three-level nature of TDF emission, which leads to strong re-absorption of short wavelength light. This was driven by a plenty of applications such as deep bio-imaging, spectroscopic analysis and material processing that takes advantages of the third near-infrared (NIR3) optical window (1600–1870 nm) for bioimaging and abundant molecular absorptions in this spectral region. At present, short wavelength TDFLs have been demonstrated to operate in the continues-wave (CW), soliton mode-locking and gain-switching regimes. Here we report a TDFL that demonstrates dissipative soliton resonance (DSR) at 1750 nm with a maximum single pulse energy of 321.2 nJ.
关键词： high energy,thulium-doped fiber lasers,1750 nm,1.7-μm region,dissipative soliton resonance
更新于2025-09-11 14:15:04
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112-μJ 180-fs pulses at 1-kHz repetition rate from Yb-doped laser based on strictly all-fiber CPA structure
摘要： In this paper, we reported an Yb-doped, femtosecond, chirped pulse amplification laser based on strictly all-fiber structure. It operated at a low repetition rate of 1 kHz and adopted the synchronously pumping technology to suppress ASE and heat accumulation. A chirped fiber Bragg grating providing adjustable dispersion is used as the pulse stretcher. High order dispersion induced by fiber, grating pair in the system was compensated accurately. Laser pulse with duration of 180 fs and energy of 112 μJ has been obtained. In addition, it has a high long-term stability of energy and a good beam quality, corresponding to energy fluctuation of 0.62% in an hour and M2 factor of 1.15, respectively.
关键词： femtosecond fiber laser,high energy,Chirped pulse amplification,synchronously pumping technology
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - High Energy Pulsed Operation of a Yb Fibre MOPA with Amplified Spontaneous Emission Output
摘要： High energy pulsed fibre lasers are attractive to numerous applications in areas including industry, science, metrology and defense due to their excellent characteristics such as high average powers, a diffraction-limited beam quality, compactness and high flexibility in operation. However, their pulse energy is often limited by nonlinear optical phenomena, such as SBS (Stimulated Brillouin Scattering), SRS (Stimulated Raman scattering), self-focusing, etc., due to the small core size, resulting in unstable operation and catastrophic damage of the fibre. Enlarging the core size along with shortening the fibre length is a simple and straightforward way to overcome this problem, but at the expense of beam quality degradation and increased thermal effects. Fibre-based superfluorescent sources (FSS), sometimes referred to as amplified-spontaneous-emission (ASE) fibre light sources, can be an alternative way to achieve higher pulse energy from a typical step-index fibre while preserving the good beam characteristics of the fibre laser. Since the FSS has a broad spectrum without longitudinal modes, its spectral power is smaller than that of the fibre laser, increasing SBS threshold and, hence, generation of a high energy pulse. In this study, we report pulsed operation of the fibre-based superfluorescent light source. From a Yb fibre MOPA using an ASE source as a seed, we successfully generated high energy superfluorescent light pulses and investigated its performance for different repetition rates, pulse widths, and spectral linewidths. Furthermore, the results were compared with those of a Yb fibre laser.
关键词： ASE fibre light sources,self-focusing,fibre-based superfluorescent sources,nonlinear optical phenomena,amplified spontaneous emission,SBS,SRS,Yb fibre MOPA,High energy pulsed fibre lasers
更新于2025-09-11 14:15:04