162 citations · 805 across the 25 of their papers we have counts for
26 papers
Outdoor 100-m-scale air waveguides
Andrew Goffin, Gregory Babic, Andrew DeRusha +3
Optical power densities for standoff spectroscopy, remote sensing, directed energy, and free-space optical communications are limited by diffraction and adverse atmospheric conditi…
Single-Shot High-Energy Muon and Particle Radiography with a Multi-GeV Laser-Wakefield-Accelerator-Driven Source
Kaixin Zhu, G. Jackson Williams, Roberto Versaci +29
We report the first demonstration of single-shot particle radiography using a 1-10 GeV laser-wakefield-generated beam of muons, pions, and neutrons. The test objects were imaged ~1…
Topologically constrained high intensity light propagation in air
A. Goffin, L. Railing, G. Babic +1
We experimentally demonstrate how spatiotemporal optical vortices (STOVs) control long-range atmospheric filamentation of intense laser pulses. High-power pulses long enough to ove…
Measurement of directional muon beams generated at the Berkeley Lab Laser Accelerator
Davide Terzani, Stanimir Kisyov, Stephen Greenberg +20
We present the detection of directional muon beams produced using a PW laser at the Lawrence Berkeley National Laboratory. The muon source is a multi-GeV electron beam generated in…
Quasi-steady-state air waveguide
A. Goffin, A. Tartaro, H. M. Milchberg
We report the first generation of quasi-steady-state air waveguides capable of guiding high average power laser beams. The guides are produced by high-repetition rate patterned fil…
Second harmonic generation of spatiotemporal optical vortices and conservation of orbital angular momentum
S. W. Hancock, S. Zahedpour, H. M. Milchberg
Spatiotemporal optical vortices (STOVs) are a new type of intrinsic optical orbital angular momentum (OAM) structure in which the OAM vector is orthogonal to the propagation direct…
Transient-grating single-shot supercontinuum spectral interferometry (TG-SSSI)
S. W. Hancock, S. Zahedpour, H. M. Milchberg
We present a technique for the single-shot measurement of the space- and time-resolved spatiotemporal amplitude and phase of an ultrashort laser pulse. The method, transient-gratin…
Self-waveguiding of relativistic laser pulses in neutral gas channel
L. Feder, B. Miao, J. E. Shrock +2
We demonstrate that an ultrashort high intensity laser pulse can propagate for hundreds of Rayleigh ranges in a prepared neutral hydrogen channel by generating its own plasma waveg…
Guiding of high-intensity laser pulses in 100mm-long hydrodynamic optical-field-ionized plasma channels
A. Picksley, A. Alejo, J. Cowley +11
Hydrodynamic optically-field-ionized (HOFI) plasma channels up to 100mm long are investigated. Optical guiding is demonstrated of laser pulses with a peak input intensity of $6\tim…
Full path single-shot imaging of femtosecond pulse collapse in air turbulence
I. Larkin, J. Griff-McMahon, A. Schweinsberg +3
In a single shot, we measure the full propagation path, including the evolution to pulse collapse, of a high power femtosecond laser pulse propagating in air. This technique enable…
Absolute measurement of laser ionization yield in atmospheric pressure range gases over 14 decades
D. Woodbury, R. M. Schwartz, E. Rockafellow +2
Strong-field ionization is central to intense laser-matter interactions. However, standard ionization measurements have been limited to extremely low density gas samples, ignoring…
Laser-Plasma Interactions Enabled by Emerging Technologies
J. P. Palastro, F. Albert, B. Albright +51
An overview from the past and an outlook for the future of fundamental laser-plasma interactions research enabled by emerging laser systems.
Ultrashort infrared 2.5-11μm pulses: spatiotemporal profiles and absolute nonlinear response of air constituents
S. Zahedpour, S. W. Hancock, H. M. Milchberg
We measure the detailed spatiotemporal profiles of femtosecond laser pulses in the infrared wavelength range λ=2.5-11μm, and the absolute nonlinear response of major air constituen…
Coherent ultra-broadband laser-assisted injection radiation from a laser plasma accelerator
B. Miao, L. Feder, J. Elle +5
The injection of electrons into a laser wakefield accelerator (LWFA) is observed to generate an intense coherent ultra-broadband and ultrashort pulse radiation flash, consistent wi…
MeV electron acceleration at 1 kHz with <10mJ laser pulses
F. Salehi, A. J. Goers, G. A. Hine +6
We demonstrate laser driven acceleration of electrons to MeV-scale energies at 1kHz repetition rate using <10mJ pulses focused on near-critical density He and H2 gas jets. Using th…
Absolute measurement of the ultrafast nonlinear electronic and rovibrational response in H and D
J. K. Wahlstrand, S. Zahedpour, Y. -H. Cheng +2
The electronic, rotational, and vibrational components of the ultrafast optical nonlinearity in H and D are measured directly and absolutely at intensities up to the ioniza…
Measurement of the nonlinear refractive index of air constituents at mid-infrared wavelengths
S. Zahedpour, J. K. Wahlstrand, H. M. Milchberg
We measure the nonlinear refractive index coefficients in N, O and Ar from visible through mid-infrared wavelengths (λ= 0.4 - 2.4 μm). The wavelengths investigated correspo…
Multi-MeV electron acceleration by sub-terawatt laser pulses
A. J. Goers, G. A. Hine, L. Feder +3
We demonstrate laser-plasma acceleration of high charge electron beams to the ~10 MeV scale using ultrashort laser pulses with as little energy as 10 mJ. This result is made possib…
Sensitivity of propagation and energy deposition in femtosecond filamentation to the nonlinear refractive index
E. W. Rosenthal, J. P. Palastro, N. Jhajj +3
The axial dependence of femtosecond filamentation in air is measured under conditions of varying laser pulsewidth, energy, and focusing f-number. Filaments are characterized by the…
Collection of remote optical signals by air waveguides
E. W. Rosenthal, N. Jhajj, J. K. Wahlstrand +1
Collection of weak signals from remote locations is the primary goal and the primary hurdle of optical stand-off detection schemes. Typically, the measured signal is enhanced using…
Quantum Control of Molecular Gas Hydrodynamics
Sina Zahedpour, Jared Wahlstrand, Howard Milchberg
We demonstrate that strong impulsive gas heating or heating suppression at standard temperature and pressure can occur from coherent rotational excitation or de-excitation of molec…
Direct measurement of the acoustic waves generated by femtosecond filaments in air
J. K. Wahlstrand, N. Jhajj, E. W. Rosenthal +2
We present direct measurements of the gas acoustic dynamics following interaction of spatial single- and multi-mode 50 fs, 800 nm pulses in air at 10 Hz and 1 kHz repetition rates.…
Demonstration of long-lived high power optical waveguides in air
N. Jhajj, E. W. Rosenthal, R. Birnbaum +2
We demonstrate that femtosecond filaments can set up an extended and robust thermal waveguide structure in air with a lifetime of several milliseconds, making possible the very lon…
Optical beam dynamics in a gas repetitively heated by femtosecond filaments
N. Jhajj, Y. -H. Cheng, J. K. Wahlstrand +1
We investigate beam pointing dynamics in filamentation in gases driven by high repetition rate femtosecond laser pulses. Upon suddenly exposing a gas to a kilohertz train of filame…