A5047419359- Laser Design and Applications
- Solid State Laser Technologies
- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Luminescence Properties of Advanced Materials
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Laser Material Processing Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Advanced Chemical Physics Studies
- Spectroscopy and Laser Applications
- Quantum optics and atomic interactions
- Inorganic Fluorides and Related Compounds
- Orbital Angular Momentum in Optics
- Advanced Antenna and Metasurface Technologies
- Glass properties and applications
- Advanced Optical Sensing Technologies
- Optical Coatings and Gratings
- Radiative Heat Transfer Studies
- Molecular Spectroscopy and Structure
- Geophysics and Sensor Technology
- Plasmonic and Surface Plasmon Research
Lawrence Livermore National Laboratory
2017-2025
University of Illinois Urbana-Champaign
2011-2019
Infrared Laboratories (United States)
2019
SLAC National Accelerator Laboratory
2019
Friedrich Schiller University Jena
2019
Czech Technical University in Prague
2019
Abstract This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over last four years in unique collaboration 41 laboratories within Horizon 2020 study funded by Union. EuPRAXIA is first project that develops dedicated particle accelerator based on novel plasma acceleration concepts and laser technology. It focuses development electron accelerators underlying technologies, their user communities, exploitation existing...
We report the demonstration of a diode-pumped Tm:YLF laser operating at 1.88 µm that produces pulse energies up to 3.88 J in 20 ns. The compact system consists Q-switched cavity-dumped oscillator generating 18 mJ pulses, which are then amplified four-pass power amplifier. Energies 38.1 were obtained with long-pulse amplifier operation. These results illustrate high energy storage and extraction capabilities Tm:YLF, opening path peak average mid-infrared solid-state lasers.
We report on the generation of high energy, power pulses in a tabletop diode-pumped Tm:YLF-based laser system, which delivers amplified pulse energies up to 108 J, as well GW peak performance when seeded with nanosecond duration pulses. Furthermore, and efficiency capabilities operating Tm:YLF multi-pulse extraction (MPE) regime were explored by seeding experimental setup multi-kHz burst exhibiting low individual fluence, resulting 3.6 kW average train multi-joule-level an optical-to-optical 19%.
We report on the demonstration of a diode-pumped, Tm:YLF-based, chirped pulse amplification laser system operating at λ ≈ 1.9 µm that produces amplified energies exceeding 1.5 J using single 8-pass power amplifier. The pulses are subsequently compressed to sub-300 fs durations by diffraction grating pair, producing record >1 TW peak pulses. To best our knowledge, this is highest demonstrated for any solid-state, near-2 architecture and illustrates potential Tm:YLF next generation high-power,...
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Fractals are ubiquitous in nature, and prominent examples include snowflakes neurons. Although it has long been known that intricate optical fractal patterns can be realized with components such as gratings reflecting spheres, generating transverse modes from a laser proven to elusive. By introducing 2D network of microspheres into Fabry-Pérot cavity bounding gain medium, we demonstrate hybrid resonator which the spheres enable simultaneous generation arrays conventional (Gaussian) modes....
Novel architectures of Petawatt-class, high peak power laser systems that allow operating at repetition rates are opening a new arena commercial applications secondary sources and discovery science. The natural path to higher average is the reduction total heat load induced generated in gain medium eliminating other inefficiencies with goal turn more energy into photons while maintaining good beam quality. However, architecture must be tailored specific application parameters such as...
Ultraviolet absorption measurements and laser excitation spectroscopy in the vicinity of 248 nm provide compelling evidence for linkages between oxygen deficiency center (ODC) rare earth concentrations Yb Er-doped glass optical fibers. Investigations YAG-derived solution-doped fibers are described. For both fibers, dependence Type II ODC on number density is approximately linear, but magnitude effect greater Yb-doped Furthermore, spectra demonstrate unambiguously existence an energy transfer...
We present progress in utilizing a machine learning (ML) assisted optimization framework to study the trends parameter space defined by spectrally shaped, high-intensity, petawatt-class (8 J, 45 fs) laser pulses interacting with solid targets and give first simulation-based overview of predicted trends. A neural network (NN) incorporating uncertainty quantification is trained predict number hot electrons generated laser–target interaction as function pulse shaping parameters. The predictions...
Petawatt laser applications, such as plasma acceleration, EUV generation, neutron and materials processing are average-power limited. However, the highest petawatt-class to date has an average power of less than 1 kW. Scaling Petawatt-class lasers beyond 10 kW requires a paradigm shift in design. To date, scaling been accomplished by increasing repetition rate single-shot lasers, which each shot represents complete pump/extraction cycle. We propose alternative scheme, multipulse extraction,...
Scaling the particle beam luminosity from laser wakefield accelerators to meet needs of physics community requires a significant, thousand-fold increase in average power driving lasers. Multipulse extraction is promising technique capable scaling high peak lasers by that power. However, several best candidate materials for use multipulse amplifiers lase at wavelengths far 0.8–1.0 μm region which currently dominates research. In particular, we have identified Tm:YLF, lases near 1.9 µm, as...
The Matter in Extreme Conditions Upgrade (MEC-U) project is a major upgrade to the MEC instrument on Linac Coherent Light Source (LCLS) X-ray free electron laser (XFEL) user facility at SLAC National Accelerator Laboratory. combines XFEL with high-power, short-pulse and high energy shock driver produce study density plasmas materials found extreme environments such as interior of stars fusion reactors, providing fundamental understanding needed for applications ranging from astronomy energy....
New control techniques are required to utilize the full potential of next generation high-energy high-repetition-rate pulses lasers while ensuring their safe operation. During automated optimization an experiment, system is identify and reject unsafe laser configurations proposed by optimizer. Using conventional physics codes render impossible when applied a high energy with 1ms or less time between shots, also including fluctuations drift. To mitigate this, we using deep Bayesian neural...
Ultraviolet absorption and laser excitation spectroscopy (LES) measurements are presented for rare-earth-doped optical fibers produced from both glassy crystalline preforms. Absorption spectra obtained via broad-spectrum UV LEDs emitting in the 250nm region. LES utilizing a tunable source. The employed is frequency-doubled titanium:sapphire laser-pumped parametric amplifier (OPA) operating down to minimum wavelength of about 225nm. Our results indicate roughly linear relationship between...
We report high energy pulses from compact, diode-pumped Tm:YLF amplifiers. demonstrated pulse energies of 21.7J for 20ns and 108J long pulses. CPA produced broadband 1.6J that were subsequently compressed to 270fs.
We report the demonstration of a diode-pumped, chirped pulse amplification Tm:YLF laser that produces broadband pulses up to 1.3 J energy. Amplified at 100 mJ-level were compressed using gratings sub-400 fs duration.
Spectroscopic measurements of the 3 H 4 → 6 transition in Tm:YLF were conducted. Absorption spectra, emission and spontaneous lifetime are reported as a function both temperature doping concentration.
We report on 100J-level pulsed energy extraction from a diode-pumped Tm:YLF system. The table-top laser comprises Tm:YLF-based oscillator that seeds single amplifier to produce >21J in 20ns and 108J long-pulse operation.
We present Tm:YLF laser technology development including joule-level short pulse amplification and gas-cooling at high heat loads in two separate experiments, which shows the potential suitability of based lasers for drivers emerging applications.
We present the first demonstration of a multi-joule diode-pumped Tm:YLF amplifier. The compact demonstrator setup, consisting Tm:YLF-based oscillator producing ~20mJ, 20ns pulses at 1880nm wavelength that seeds diode pumped four-pass power amplifier, generated pulse energies up to 3.9J with maximum net gain exceeding 200. No saturation effects were observed within this as output increased exponentially input pump power. When amplifier was seeded free-running oscillator, durations still...
Bound←bound transitions of the Xe dimer at small internuclear separation (R < 4.0 Å) have been observed in 545-555 nm and 675-800 spectral regions by laser spectroscopy afterglow a pulsed microplasma with volume ∼160 nl. Transient suppression Xe2 A(1)Σ(+)(u)(O(+)(u)) --> X(1)Σ(+)(g)(O(+)(g)) emission vacuum ultraviolet (∼172 nm), induced excitation Ω(g) ← a(3)Σ(+)(u)(1(u), O(-)(u)) [Rydberg←Rydberg] molecule, has confirmed existence structure between 720 770 (reported Killeen Eden [J. Chem....
The diatomic collisional intermediate responsible for the formation of an electronically excited molecule by teratomic recombination has been observed in both spectral and temporal domains laser spectroscopy. We report experiments demonstrating thermal Xe(6s[3/2]2)-Xe(5p(6) (1)S0) atomic collision pairs to be immediate precursor Xe2 (∗)(a(3)Σu (+),A(1)Σu (+)) three body process: Xe(∗)(6s) + 2Xe ⟶ (∗) Xe, where asterisk denotes electronic state. Photoassociating Xe(6s)-Xe free ⟵ transitions...