A5071496699- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Laser Design and Applications
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Superconducting and THz Device Technology
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Microwave Engineering and Waveguides
- Physics of Superconductivity and Magnetism
- Mercury impact and mitigation studies
- Pulsed Power Technology Applications
- Metal and Thin Film Mechanics
- Cryptographic Implementations and Security
- Advanced Optical Sensing Technologies
- Electrostatic Discharge in Electronics
- Space Satellite Systems and Control
- Terahertz technology and applications
- Ion-surface interactions and analysis
- Advanced Fiber Laser Technologies
- Electromagnetic Launch and Propulsion Technology
U.S. Air Force Institute of Technology
2023-2024
Innovative Scientific Solutions (United States)
2010-2020
National Academies of Sciences, Engineering, and Medicine
2015-2016
Innovative Energy Solution (United States)
2015-2016
United States Air Force Research Laboratory
2015-2016
Wright-Patterson Air Force Base
2016
The Ohio State University
2015-2016
University of Michigan
2015
Laser acceleration of ions to ≳MeV energies has been achieved on a variety Petawatt laser systems, raising the prospect ion beam applications using compact ultra-intense technology. However, translation from proof-of-concept experiment into real-world application requires MeV-scale and an appreciable repetition rate (>Hz). We demonstrate, for first time, proton up 2 MeV at kHz milli-joule-class short-pulse system. In these experiments, 5 mJ ultrashort-pulse energy is delivered intensity near...
High-intensity laser–plasma interactions produce a wide array of energetic particles and beams with promising applications. Unfortunately, the high repetition rate average power requirements for many applications are not satisfied by lasers, optics, targets, diagnostics currently employed. Here, we aim to address need high-repetition-rate targets optics through use liquids. A novel nozzle assembly is used generate high-velocity, laminar-flowing liquid microjets which compatible low-vacuum...
We explore the use of a combination double-pulse and single-pulse laser-induced breakdown spectroscopy (LIBS) methodologies as means differentiating between solid-phase gaseous-phase analytes (namely, carbon) in an aerosol stream. A range spectral data was recorded for configurations, including both ns fs prepulse widths, while varying gas-phase mass percentage carbon from about 10% to 90% various fixed concentrations. The emission response, measured by peak-to-continuum ratio, greater...
Ultra-intense laser-matter interaction experiments (>10$^{18}$ W/cm$^{2}$) with dense targets are highly sensitive to the effect of laser "noise" (in form pre-pulses) preceding main ultra-intense pulse. These system-dependent pre-pulses in nanosecond and/or picosecond regimes often intense enough modify target significantly by ionizing and forming a plasma layer front target. Time resolved interferometry offers robust way characterize expanding during this period. We have developed novel...
Abstract We present detailed characterization of laser-driven fusion and neutron production ( $\sim {10}^5$ /second) using 8 mJ, 40 fs laser pulses on a thin (<1 μm) D ${}_2$ O liquid sheet employing measurement suite. At relativistic intensity 5\times {10}^{18}$ W/cm ${}^2$ ) high repetition rate (1 kHz), the system produces deuterium–deuterium (D-D) fusion, allowing for consistent generation. Evidence D-D is verified by suite with three independent detection systems: an EJ-309 organic...
We report observation of kHz-pulsed-laser-accelerated electron energies up to 3 MeV in the -klaser (backward) direction from a mJ laser interacting at normal incidence with solid density, flowing-liquid target. The electrons/MeV/s.r. >1 recorded here using mJ-class exceeds or equals that prior super-ponderomotive studies employing lasers lower repetition-rates and oblique incidence. Focal intensity 40-fs-duration is 1.5 · 1018 W cm-2, corresponding only ∼80 keV ponderomotive energy. Varying...
Laser-accelerated electron beams have been created at a kHz repetition rate from the reflection of intense (∼1018 W/cm2), ∼40 fs laser pulses focused on continuous water-jet in an experiment Air Force Research Laboratory. This paper investigates Particle-in-Cell simulations laser-target interaction to identify physical mechanisms acceleration this experiment. We find that standing-wave pattern by overlap incident and reflected is particularly important because standing wave can “inject”...
We present an experimental study of the generation $\sim$MeV electrons opposite to direction laser propagation following relativistic interaction at normal incidence a $\sim$3 mJ, $10^{18}$ W/cm$^2$ short pulse with flowing 30 $\mu$m diameter water column target. Faraday cup measurements record hundreds pC charge accelerated energies exceeding 120 keV, and energy-resolved secondary x-ray emissions reveal spectrum peaking above 800 which is significantly higher energy than previous studies...
Super-intense laser plasma interaction has shown great promise as a platform for next generation particle accelerators and sources electron, x-rays, ions neutrons. In particular, when relativistic intense focus interacts with thin solid density target, ionized electrons are accelerated to near the speed of light (c) within an optical cycle pushed in forward transverse directions away from focus, carrying significant portion energy. These effectively collisionless, their interactions...
We present 3D Particle-in-Cell (PIC) modeling of an ultra-intense laser experiment by the Extreme Light group at Air Force Research Laboratory using Large Scale Plasma (LSP) PIC code. This is first time simulations have been performed in for this which involves ultra-intense, short-pulse (30 fs) interacting with a water jet target normal incidence. The laser-energy-to-ejected-electron-energy conversion efficiency observed 2D(3v) were comparable to efficiencies seen simulations, but angular...
We present how chamber background pressure affects energetic proton acceleration from an ultra-intense laser incident on a thin liquid target. A high-repetition-rate (100 Hz), 3.5 mJ with peak intensity of [Formula: see text] impinged 450 nm sheet flowing ethylene glycol. For these parameters, we experimentally demonstrate threshold in laser-to-proton conversion efficiency at pressures text], wherein the overall energy ions increases by order magnitude. Proton becomes increasingly efficient...
Pump/probe optical-transmission measurements are used to monitor in space and time the ionization of a liquid column water following impact an 800-nm, 45-fs pump pulse. The pulse strikes 53-μm-diameter normal its axis with intensities up 2 × 10(15) W/cm2. After initial photoinization for probe delay times < 500 fs, neutral surrounding beam is rapidly ionized transverse direction, presumably by hot electrons velocities 0.55 speed light (relativistic kinetic energy ~100 keV). Such unusual...
We report observation of kHz-pulsed-laser-accelerated electron energies up to 3 MeV in the -$k_\text{laser}$ (backward) direction from a mJ laser interacting at normal incidence with solid density, flowing-liquid target. The electrons/MeV/s.r. >1 recorded here using mJ-class exceeds or equals that prior super-ponderomotive studies employing lasers lower repetition-rates and oblique incidence. Focal intensity 40-fs-duration is 1.5 $\cdot$ 10$^{18}$ W cm$^{-2}$, corresponding only ~80 keV...