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We study theoretically the spatial distribution of the THz emission from the wakes in a magnetized plasma and predict potential THz power yield in the range of several hundred watts
Experiments explore guiding of intense laser pulses, optimization using channel formation beams and gas jet targets, and the interplay of channel guiding and relativistic self guiding. Impact on laser wakefield particle acceleration is being assessed
A highly automated and remote controlled Ti:sapphire CPA laser system provides synchronized beams of 2 times 1.0-TW, 12-TW, and 100-TW peak-power, in a unique, radiation shielded facility specially designed to study laser wake-field acceleration in plasmas
Nonlinear Thomson scattering radiation has been observed from relativistic laser plasma interaction. We found that this radiative process is dominant for very high intensity at which point the relativistic scattering of the laser light originates from MeV energy electrons inside the plasma
By using an axicon lens in conjunction with the ignitor-heater scheme, a 1.2-cm-long high-quality plasma waveguide is generated efficiently, which can extend the range of laser-plasma interaction much beyond the limit of Rayleigh range
Polychromatic and femtosecond keV X-ray beams have been generated from laser-plasma interactions. We present results on the synchrotron radiation from relativistic electrons undergoing betatron oscillations, and on nonlinear Thomson scattering radiation
Femtosecond excitation of spatially modulated electron hole plasmas leads to an ultrafast structural response within the unit cell of GaAs/AlGaAs superlattices. The transient rocking curve reflects the expansion of wells and compression of barriers
We demonstrate high-order quasi-phase-matched conversion of laser light into the water-window region of the spectrum around 300 eV for the first time. We also demonstrate phase matching in a fully ionized gas for the first time
We report on the observation and characterization of intense pulsed coherent THz radiation. This radiation is generated by ultra-short multi-nC electron bunches passing the plasma/vacuum boundary. The electron bunches are produced through laser wakefield acceleration
Self-focusing in clustered media is utilized to generate end-pumped, preformed plasma waveguides for guiding intense laser pulses. The waveguides are studied using end-mode imaging and transverse interferometry. Propagation of high-intensity femtosecond laser pulses is demonstrated
We report time-resolved measurements of frequency modulations of intense laser pulses interacting with clustered gas jets. The results are consistent with recent observations of intense laser self-focusing in these jets
Focusing relativistic-intensity pulses to the wavelength scale in plasma leads to the formation of isolated attosecond pulses with ten percent efficiency in simulations. Experiments show this relativistic electron motion is present at 5times1017 W/cm2
Laser generated, highly collimated multi-MeV electron jets were used to induce nuclear reactions in high-Z materials like 197Au, 181Ta and in 129I. Applications of laser-induced nuclear reactions are presented
Measurement of energetic electrons produced by focusing the Vulcan petawatt pulse onto the edge of a supersonic gas jet is performed. During the experiment, the laser consistently produced 650 fs duration pulses delivering ~ 180 J on target and generating intensities greater than 3 times 1020 Wcm-2. Electrons are measured up a maximum energy of greater than 350 MeV, the highest energy observed from...
Deeply modulated MeV ion spectra are obtained from water droplet targets irradiated by intense (~1019 W/cm2) laser pulses. Multi electron-temperature plasma, which has been verified experimentally, can account for the spectral modulations
Wc present the generation of electron jets of a temperature of about 20 MeV. The electron jets are highly collimated to a divergence of less than 10 millirad
Optically controlled seeding of Raman forward scattering and electron injection in a self-modulated laser wakefield accelerator is achieved by introducing a copropagating prepulse with proper timing. Seeding mechanisms are identified from the experimental data
Prepulse controlled laser beam propagation is demonstrated by utilizing transient refractive index in expanding-nanoplasma gases. The correlation between macroscopic refractive index and microscopic polarizability is verified, supporting the one-dimensional self-consistent hydrodynamic nanoplasma model
Cluster heating by a strong laser field is studied using a particle-in-cell code (PIC) for a range of intensities and cluster sizes. Above a threshold intensity, heating is dominated by a nonlinear resonant absorption process
Third-harmonic generation from noble-gas clusters by ultrashort probe pulses is more sharply resonantly-enhanced than linear absorption following heating by an ultrashort pump pulse. Simulations of cluster expansion and collective electron dynamics reproduce the observed trends
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