E. Granados
A5042882340- Laser-Plasma Interactions and Diagnostics
- High-pressure geophysics and materials
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Diamond and Carbon-based Materials Research
- Solid State Laser Technologies
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Optical Network Technologies
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Laser Material Processing Techniques
- Particle accelerators and beam dynamics
- Astrophysics and Cosmic Phenomena
- Advanced Photonic Communication Systems
- Laser Design and Applications
- Advanced Optical Network Technologies
- Laser-induced spectroscopy and plasma
- Photonic Crystal and Fiber Optics
- Ion-surface interactions and analysis
- Magnetic confinement fusion research
- Particle Detector Development and Performance
- Semiconductor Lasers and Optical Devices
European Organization for Nuclear Research
2018-2024
SLAC National Accelerator Laboratory
2015-2024
Universidad de Guanajuato
2020-2024
Minerva Foundation
2023
Macquarie University
2009-2022
Linac Coherent Light Source
2015-2022
Universidad de Navarra
2017-2022
Stanford University
2022
University of Strathclyde
2022
National Technical University of Athens
2022
We demonstrate mode-division multiplexed WDM transmission over 50-km of few-mode fiber using the fiber's LP 01 and two degenerate 11 modes.A EDFA is used to boost power output signal before a coherent receiver.A 6×6 time-domain MIMO equalizer recover transmitted data.We also experimentally characterize EDFA.
High energy particle accelerators have been crucial in providing a deeper understanding of fundamental particles and the forces that govern their interactions. In order to increase or reduce size accelerator, new acceleration schemes need be developed. Plasma wakefield acceleration, which electrons plasma are excited, leading strong electric fields, is one such promising novel technique. Pioneering experiments shown an intense laser pulse electron bunch traversing plasma, drives fields 10s...
Abstract The shock-induced transition from graphite to diamond has been of great scientific and technological interest since the discovery microscopic diamonds in remnants explosively driven graphite. Furthermore, shock synthesis lonsdaleite, a speculative hexagonal carbon polymorph with unique hardness, is expected happen during violent meteor impacts. Here, we show unprecedented situ X-ray diffraction measurements formation on nanosecond timescales by compression pyrolytic as well...
We demonstrate highly efficient terahertz (THz) generation by optical rectification (OR) of near-optimum pump pulses centered at 1.03 μm in cryogenically cooled lithium niobate. Using a close to optimal pulse duration 680 fs and energy 1.2 mJ, we report conversion efficiencies above 3.8±0.4%, which is more than an order magnitude higher previously reported. The results confirm the advantage using cryogenic cooling niobate crystal that significantly reduces THz absorption, enabling scaling...
We demonstrate wavelength- and mode-division multiplexed transmission over a fiber re-circulating loop comprising 50-km of low-DMGD few-mode fiber, an optimized EDFA with reduced wavelength-dependent gain mode-dependent gain. characterize the channel matrix in terms its singular value spread, investigate long-term stability.
A seven-core few-mode multicore fiber in which each core supports both the LP <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> mode and two degenerate xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> modes has been designed fabricated for first time, to best of our knowledge. The hole-assisted structure enables low inter-core crosstalk high density at same time. measured be lower than -60 dB/km. around -40 dB/km using a different...
The LCLS beam provides revolutionary capabilities for studying the transient behavior of matter in extreme conditions. particular strength Matter Extreme Conditions instrument is that it combines unique with high-power optical laser beams, and a suite dedicated diagnostics tailored this field science. In paper an overview beamline, instrumentation, selected highlights experiments commissioning results are presented.
The matter in extreme conditions end station at the Linac Coherent Light Source (LCLS) is a new tool enabling accurate pump–probe measurements for studying physical properties of high-energy density (HED) physics regime. This instrument combines world's brightest x-ray source, LCLS beam, with high-power lasers consisting two nanosecond Nd:glass laser beams and one short-pulse Ti:sapphire laser. These produce short-lived states high pressures, temperatures or densities that are important...
Abstract Scattering of high energy particles from nucleons probes their structure, as was done in the experiments that established non-zero size proton using electron beams 1 . The use charged leptons scattering enables measuring distribution electric charges, which is encoded vector form factors nucleon 2 weakly interacting neutrinos gives opportunity to measure both and axial nucleon, providing an additional, complementary probe structure. transition factor, F A , can be measured neutrino...
We demonstrate the generation of an intense soft-x-ray-laser beam by saturated amplification high harmonic seed pulses in a dense transient collisional plasma amplifier created heating titanium target. Amplification 32.6 nm line Ne-like Ti generates laser subpicosecond duration that are measured to approach full spatial coherence. The peak spectral brightness is estimated be approximately 2 x 10(26) photons/(s mm(2) mrad(2) 0.01% bandwidth). scheme scalable produce extremely bright lasers at...
We demonstrate mode division multiplexed WDM transmission using the LP01 and LP11 modes of a few fiber. The signal is recovered 6×6 MIMO equalizer at receiver after amplification by EDFA.
We present a synchronously pumped diamond Raman laser operating at 275.7 nm by the 4th harmonic of mode locked Nd:YVO4 laser. The had threshold pump pulse energy 5.8 nJ and generated up to 0.96 pulses 10.3% conversion efficiency. results agree well with numerical model that includes two-photon absorption Stokes beams uses gain coefficient 100 cm/GW. also report on observation nanometer scale assisted etching crystal surfaces.
We discuss the possibility of obtaining highly precise measurements ionization potential depression in dense plasmas with spectrally resolved x-ray scattering, while simultaneously determining electron temperature and free density. A proof-of-principle experiment at Linac Coherent Light Source, probing isochorically heated carbon samples, demonstrates capabilities this method motivates future experiments laser facilities.
We report, and review in detail, experiments resulting a record 3.7% optical-to-terahertz (THz) conversion efficiency by optical rectification (OR) cryogenically cooled congruent lithium niobate (cLN) using near-optimal 680 fs pump pulse at 1030 nm. In addition, we report of 1.7% room temperature stoichiometric (sLN) which results 21.8 μJ THz energy from 1.2 mJ pulse. Electro-optical sampling measurements reveal the pulses to be single-cycle centered 0.45 THz. The experimentally measured...
We give direct experimental evidence for the observation of full transverse self-modulation a long, relativistic proton bunch propagating through dense plasma. The exits plasma with periodic density modulation resulting from radial wakefield effects. show that is seeded by ionization front created using an intense laser pulse copropagating bunch. extends over length following seed point. By varying one order magnitude, we frequency scales expected dependence on density, i.e., it equal to...
Time-resolved x-ray diffraction (XRD) of compressed liquid water shows transformation to ice VII in 6 nsec, revealing crystallization rather than amorphous solidification during compression freezing. Application classical nucleation theory indicates heterogeneous and one-dimensional (e.g., needlelike) growth. These first XRD data demonstrate rapid growth kinetics with implications for fundamental physics diffusion-mediated thermodynamic modeling collision or impact events on ice-rich...
A cryogenic composite-thin-disk amplifier with amplified spontaneous emission (ASE) rejection is implemented that overcomes traditional laser system problems in high-energy pulsed drivers of high average power. small signal gain 8 dB was compared to a 1.5 for an uncapped thin-disk without ASE mitigation under identical pumping conditions. strict image relayed 12-pass architecture using off-axis vacuum telescope and polarization switching extracted 100 mJ at 250 Hz beam quality stretched 700...
The seeded self-modulation of a relativistic, charged particle bunch in plasma is shown to grow both along the and plasma, resulting transverse wakefield amplitudes that far exceed initial seed values.
We show in experiments that a long, underdense, relativistic proton bunch propagating plasma undergoes the oblique instability, which we observe as filamentation. determine threshold value for ratio between transverse size and skin depth instability to occur. At threshold, outcome of experiment alternates filamentation self-modulation (evidenced by longitudinal modulation into microbunches). Time-resolved images density distribution reveal grows an observable level late along bunch,...
We report on a kHz, mJ-level, carrier-envelope phase (CEP)stable ultrabroadband optical parametric chirped-pulse amplifier (OPCPA) at 2.1-µm wavelength, pumped by high-energy, 14 ps, cryogenic Yb:YAG pump laser, and its application to high-order harmonic generation (HHG) with Xe.The pre-amplifier chain is 12-ps Nd:YLF laser both lasers are optically synchronized the signal pulse of OPCPA.An amplified energy 0.85 mJ was obtained final OPCPA stage good beam profile.The compressed 4.5 cycles...
We report on efficient generation of millijoule-level, kilohertz-repetition-rate few-cycle laser pulses with radial polarization by combining a gas-filled hollow-waveguide compression technique suitable mode converter. Peak power levels >85 GW are routinely achieved, capable reaching relativistic intensities >10(19) W/cm2 carrier-envelope-phase control, employing readily accessible ultrafast high-energy technology.
Using x-ray diffraction at the Linac Coherent Light Source free-electron laser, we have determined simultaneously and self-consistently phase transitions equation of state (EOS) lightest transition metal, scandium, under shock compression. On compression scandium undergoes a structural between 32 35 GPa to same bcc structure seen high temperatures ambient pressures, then further 46 incommensurate host-guest polymorph found above 21 in static room temperature. Shock melting is observed 53 72...
We study the fabrication of photonic surface structures in single crystal diamond by means highly controllable direct femtosecond UV laser induced periodic structuring. By appropriately selecting excitation wavelength, intensity, number impinging pulses and their polarization state, we demonstrate emerging high quality fidelity grating with roughness below 1.4 nm. characterize optical properties potential for structure anti-reflection coatings Raman lasers near-IR.