A5026289768- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Diamond and Carbon-based Materials Research
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced X-ray Imaging Techniques
- Solid State Laser Technologies
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Plasma Diagnostics and Applications
- Spectroscopy and Laser Applications
- Ion-surface interactions and analysis
- Advanced Fiber Laser Technologies
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Photonic and Optical Devices
- Gyrotron and Vacuum Electronics Research
- Astro and Planetary Science
Lawrence Livermore National Laboratory
2014-2024
University of Notre Dame
2012-2020
Atomic Weapons Establishment
2020
New York University Press
2019
QIMR Berghofer Medical Research Institute
2019
Hospital Universitário da Universidade de São Paulo
2019
Kinokuniya
2019
Cambridge University Press
2019
History of Science Society
2012
Military University of Technology in Warsaw
2001
We have demonstrated small signal gain saturation on several transient-gain Ni-like ion x-ray lasers by using a high-power, chirped-pulse amplification, tabletop laser. These results been achieved at wavelengths from 139--203 \AA{} total of 5--7 J energy in traveling-wave excitation scheme. Strong amplification is also observed for Sn 119 \AA{}. Gain $62{\mathrm{cm}}^{\ensuremath{-}1}$ and gL product 18 are determined the $4d\ensuremath{\rightarrow}4p$ transition Pd 147 with an output...
We report an application of the prepulse technique which uses a low-intensity before main optical drive pulse to prepare plasma prior lasing in low-Z, Ne-like ions. x-ray lasers are now available over previously inaccessible range wavelengths. As illustration this we observation ${\mathrm{Cr}}^{14+}$ and ${\mathrm{Fe}}^{16+}$ on J=0\ensuremath{\rightarrow}1, 3p\ensuremath{\rightarrow}3s transitions at 285 255 \AA{} as well gain measurements for ${\mathrm{Ti}}^{12+}$.
A saturated nickel-like samarium x-ray laser beam at 7 nanometers has been demonstrated with an output energy of 0.3 millijoule in 50-picosecond pulses, demonstrating that operation a wavelengths shorter than 10 can be achieved. The narrow divergence, short wavelength, pulse duration, high efficiency, and brightness this make it ideal candidate for many applications.
We have performed spectrally resolved x-ray scattering measurements on highly compressed polystyrene at pressures of several tens TPa (100 Mbar) created by spherically convergent shocks the National Ignition Facility. Scattering data line radiation 9.0 keV were recorded from dense plasma shortly after shock coalescence. Accounting for spatial gradients, opacity effects, and source broadening, we demonstrate sensitivity elastic component to carbon K-shell ionization while same time...
We report an observation of soft-x-ray lasing in Ti, at 326.5 \AA{}, based on recent experiments conducted the Glass Development Laser (1.054 \ensuremath{\mu}m) Laboratory for Energetics and Nova laser (0.53 Lawrence Livermore National Laboratory. This Ti laser, which has been identified as a 3p\ensuremath{\rightarrow}3s transition Ne-like is unusual several ways; J=0\ensuremath{\rightarrow}1, observed to be dominant line spectrum, output very narrow divergence, only where main optical pulse...
Powerful terahertz (THz) radiation is observed from large-scale underdense preplasmas in front of a solid target irradiated obliquely with picosecond relativistic intense laser pulses. The covers an extremely broad spectrum about 70% its energy located the high frequency regime over 10 THz. pulse found to be above 100 μJ per steradian specular direction at optimal preplasma scale length around 40-50 μm. Particle-in-cell simulations indicate that mainly produced by linear mode conversion...
We have developed an experimental platform for the National Ignition Facility that uses spherically converging shock waves absolute equation-of-state (EOS) measurements along principal Hugoniot. In this Letter, we present one indirect-drive implosion experiment with a polystyrene sample employs radiographic compression over range of pressures reaching up to 60 Mbar (6 TPa). This significantly exceeds previously published results obtained on Nova laser [R. Cauble et al., Phys. Rev. Lett. 80,...
We report the first demonstration of saturation in a Ni-like x-ray laser, specifically Ag laser at 14 nm. Using high-resolution spatial imaging and angularly resolved streaking techniques, output source size as well time history, divergence, energy, profile beam have been fully characterized. The intensity was measured to be about $70\mathrm{GW}{\mathrm{cm}}^{\ensuremath{-}2}$. narrow short pulse duration, high efficiency, brightness make it an ideal candidate for many applications.
We report here a novel laser resonator with the ability to correct for intracavity phase distortions. The optical cavity employs passive (self-pumped) conjugate reflector provide this capability.
The equation of state (EOS) materials at warm dense conditions poses significant challenges to both theory and experiment. We report a combined computational, modeling, experimental investigation leveraging new theoretical capabilities investigate warm-dense boron nitride (BN). simulation methodologies include path integral Monte Carlo (PIMC), several density functional (DFT) molecular dynamics methods [plane-wave pseudopotential, Fermi operator expansion (FOE), spectral quadrature (SQ)],...
We present the first results from picosecond interferometry of dense laser-produced plasmas using a soft x-ray laser. The duration and short wavelength 14.7 nm Ni-like Pd laser mitigates effects associated with motion blurring refraction through millimeter-scale plasmas. This enables direct measurement electron-density profile to within 10 microm target surface. A series high-quality two-dimensional (2D) density measurements provide unambiguous characterization time evolution in...
A new resonance principle in optical filters has been utilized to simultaneously permit realization of wide field-of-view (∼2π sr) and very narrow acceptance bandwidths, approaching 0.01 Å. light signal is transmitted through an outer bandpass filter into a resonantly absorbing atomic vapor, resulting fluorescence at different wavelength which inner filter. The have no common transmission band, complete blockage all signals (background noise) that are not shifted by the intervening vapor....
The average-atom model is applied to study Thomson scattering of x-rays from warm-dense matter with emphasis on by bound electrons. Parameters needed evaluate the dynamic structure function (chemical potential, average ionic charge, free electron density, and continuum wave-functions occupation numbers) are obtained model. resulting analysis provides a relatively simple diagnostic for use in connection x-ray measurements. Applications given dense hydrogen, beryllium, aluminum titanium...
The development of tabletop intense terahertz (THz) radiation sources is significantly important for THz science and applications.This paper presents our measurements from relativistic laser-plasma interactions under different experimental conditions.Several generation mechanisms have been proposed investigated, including coherent transition emitted by fast electrons the target rear surface, transient current at front target, mode conversion electron plasma waves to waves.The results...
Over the last six years many experiments have been done at National Ignition Facility to measure Hugoniot of materials, such as CH plastic extreme pressures, up 800 Mbar. The “Gbar” design employs a strong spherically converging shock launched through solid ball material using hohlraum radiation drive. front conditions are characterized x-ray radiography. In this paper we examine role in heating unshocked understand impact it has on equation state measurements and how drives measured data...
We report on measurements of the saturated single frequency output a GeXXIII x-ray laser J=0\ensuremath{\rightarrow}1 transition at 19.6 nm from refraction compensating double target driven by 150 J energy 75-ps Nd-glass pulses. The 19.6-nm line completely dominated output. was measured to be 0.9 mJ in beam 6.6\ifmmode\times\else\texttimes\fi{}30 ${\mathrm{mrad}}^{2}$ divergence, corresponding conversion efficiency 6\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}6}$....
We present clear experimental evidence showing that the contribution of bound electrons can dominate index refraction laser-created plasmas at soft x-ray wavelengths. report anomalous fringe shifts in laser interferograms Al plasmas. The comparison measured and simulated shows this results from dominant low charge ions to refraction. This usually neglected electron affect propagation radiation interferometric diagnostics for many elements.
Third-order susceptibilities are calculated for a Doppler-broadened two-level system. The dependence of four-wave mixing on the angle θ between pump and signal fields is studied, reflection coefficient shown to have narrow field view that inversely proportional ratio Doppler width homogeneous linewidth. For collinear geometry, = 0°, frequency nondegenerate case analyzed capable yielding real-time narrow-bandwidth optical filter whose bandwidth limited by
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Joseph Nilsen and Amnon Yariv, "Nearly degenerate four-wave mixing applied optical filters," Appl. Opt. 18, 143-145 (1979) Export BibTex Endnote (RIS) HTML Plain alert Save article
We report a theoretical equation of state (EOS) table for boron across wide range temperatures ($5.1\ifmmode\times\else\texttimes\fi{}{10}^{4}$--$5.2\ifmmode\times\else\texttimes\fi{}{10}^{8}$ K) and densities (0.25--49 g/${\mathrm{cm}}^{3}$) experimental shock Hugoniot data at unprecedented high pressures ($5608\ifmmode\pm\else\textpm\fi{}118$ GPa). The calculations are performed with first-principles methods combining path-integral Monte Carlo (PIMC) density-functional-theory...
The $J\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0\ensuremath{\rightarrow}1,3p\ensuremath{\rightarrow}3s$ transition at 182 \AA{} in neonlike selenium is observed to completely dominate the lasing output, as predicted but never before this work. Instead of a single long pulse we use series short 100 ps pulses from Nova laser illuminate slab targets selenium. line more than an order magnitude brighter usual 206 and 209 lines. Similar behavior for ions germanium, zinc, nickel.
This paper presents the wavelengths of neon-like 3p → 3s laser lines which have been observed in both lasing and nonlasing plasmas compares experimental with relativistic multi-configuration Hartree-Fock calculations order to estimate for these all ions between S6+ Xe44+. The seven transitions lase some are considered this work.