Luis Roso

Luis Roso
Centro de Láseres Pulsados Ultracortos Ultraintensos | CLPU · Direction

Prof of Applied Physics (Extreme Lasers)

About

302
Publications
23,072
Reads
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3,772
Citations
Introduction
Interest in the physics of atoms driven by intense lasers. Director of the Spanish Center for Pulsed Lasers (the Spanish Petawatt laser), a facility open to international users. www.clpu.es
Research Experience
December 2007 - present
Centro de Láseres Pulsados Ultracortos Ultraintensos
Position
  • Director
Description
  • CLPU is the home of the Spanish Petawatt Laser, it is a national facility, the national users facility for femtosecond lasers.
January 1992 - October 2008
Universidad de Salamanca
Position
  • Full Professor
September 1985 - August 1986
University of Rochester
Position
  • Fulbright
Description
  • Visiting Scholar

Publications

Publications (302)
Article
Full-text available
We report on the development of a highly directional, narrow energy band, short time duration proton beam operating at high repetition rate. The protons are generated with an ultrashort-pulse laser interacting with a solid target and converted to a pencil-like narrow-band beam using a compact magnet-based energy selector. We experimentally demonstr...
Preprint
Full-text available
We report on the development of a highly directional, narrow energy band, short time duration proton beam operating at high repetition rate, suitable for measurements of stopping power in high energy density plasmas as well as other applications. The protons are generated with an ultrashort-pulse laser interacting with a solid target and converted...
Article
Full-text available
An approach based on the finite-difference time-domain (FDTD) method is developed for simulating the dynamics of two ultrashort laser pulses inside a saturable absorbing media. This work discusses the results obtained using this numerical model for the prediction of the nonlinear absorbing media behaviour as well as how it affects the final double...
Conference Paper
Full-text available
A new tool for characterizing relativistic Thomson scattering for intensities above 1018 W/cm2 will be presented.
Conference Paper
Elements of an in situ gauge exploiting relativistic Thomson scattering for measuring intensities from 1018 to 1025 W/cm2 and expelling electrons and protons from the focal volume will be presented.
Preprint
Full-text available
We present a scintillator-based detector able to measure the proton energy and the spatial distribution with a relatively simple design. It has been designed and built at the Spanish Center for Pulsed Lasers (CLPU) in Salamanca and tested in the proton accelerator at the Centro de Micro-Análisis de Materiales (CMAM) in Madrid. The detector is capab...
Article
Full-text available
We present a scintillator-based detector able to measure the proton energy and the spatial distribution with a relatively simple design. It has been designed and built at the Spanish Center for Pulsed Lasers (CLPU) in Salamanca and tested in the proton accelerator at the Centro de Micro-Análisis de Materiales (CMAM) in Madrid. The detector is capab...
Article
Full-text available
About 50 years ago, Sarachick and Schappert [Phys. Rev. D. 1, 2738-2752 (1970)] showed that relativistic Thomson scattering leads to wavelength shifts that are proportional to the laser intensity. About 28 years later, Chen et al. [Nature 396, 653-655 (1998)] used these shifts to estimate their laser intensity near 1018 W/cm 2. More recently, there...
Preprint
Full-text available
About 50 years ago, Sarachick and Schappert [Phys. Rev. D. 1, 2738 (1970)] showed that relativistic Thomson scattering leads to wavelength shifts that are proportional to the laser intensity. About 28 years later Chen et al. [Nature 396, 653 (1998)] used these shifts to estimate their laser intensity near 10^18 W/cm^2. More recently there have been...
Article
A prototype of a highly adjustable Kirkpatrick-Baez (KB) microscope has been designed, built, and tested in a number of laser driven x-ray experiments using the high power (200 TW) VEGA-2 laser system of the Spanish Centre for Pulsed Lasers (CLPU). The presented KB version consists of two, perpendicularly mounted, 500 μm thick silicon wafers, coate...
Article
Full-text available
The Centro de Laseres Pulsados in Salamanca, Spain has recently started operation phase and the first user access period on the 6 J 30 fs 200 TW system (VEGA 2) already started at the beginning of 2018. In this paper we report on two commissioning experiments recently performed on the VEGA 2 system in preparation for the user campaign. VEGA 2 syste...
Conference Paper
Nearly 50 years ago Sarachik and Schappert suggested an intensity gauge based on wavelength shifts due to relativistic Thomson scattering. We present the first preliminary experimental results exploiting these shifts to make a direct measurement of peak intensities above 1018 W/cm2.
Article
Full-text available
We report the development of a table-top high peak power Titanium:Sapphire (Ti:Sa) CPA laser working at 100 Hz capable of delivering 205 mJ, 55 fs pulses. Every amplification stage is pumped by Nd-doped solid-state lasers and fully powered by diodes. Thermal effects in the Ti:Sa amplifiers are compensated passively with optics. This system is inten...
Preprint
A promising prototype of a highly adjustable Kirkpatrick-Baez (KB) microscope has been designed, built and tested in a number of laser driven x-ray experiments using the high power (200TW) VEGA-2 laser system of the Spanish Centre for Pulsed Lasers (CLPU). The presented KB version consists of two, perpendicularly mounted, 500{\mu}m thick Silicon wa...
Preprint
Full-text available
The Centro de Laseres Pulsados in Salamanca Spain has recently started operation phase and the first User access period on the 6 J 30 fs 200 TW system (VEGA 2) already started at the beginning of 2018. In this paper we report on two commissioning experiments recently performed on the VEGA 2 system in preparation for the user campaign. VEGA 2 system...
Conference Paper
Selective deoxygenation of graphene oxide has been conducted with regard with the design and fabrication of graphene based devices. The ion beam lithography is considered to be a powerful method for patterning onto graphene oxide foil. A helium beam has been used for both direct patterning onto graphene oxide foil and simultaneous online characteri...
Article
We present a technique for the synthesis of ultrashort laser pulses with approximately one cycle (FWHM) of temporal duration. These pulses are characterized by a certain degree of chirp. We show that these pulses produce both an enhancement of the high-order harmonic generation (HHG) cutoff and a noticeable increase of the yield, when interacting w...
Article
Full-text available
In the context of electromagnetism and nonlinear optical interactions damping is generally introduced as a phenomenological, viscous term that dissipates energy, proportional to the temporal derivative of the polarization. Here, we follow the radiation reaction method presented in [G. W. Ford and R. F. O'Connell, Phys. Lett. A, 157, 217 (1991)], wh...
Article
CR-39 nuclear track material is frequently used for the detection of protons accelerated in laser-plasma interactions. The measurement of track densities allows for determination of particle angular distributions, and information on the kinetic energy can be obtained by the use of passive absorbers. We present a precise method of measuring spectral...
Article
Full-text available
We study high-order harmonic generation (HHG) in model atoms driven by plasmonic-enhanced fields. These fields result from the illumination of plasmonic nanostructures by few-cycle laser pulses. We demonstrate that the spatial inhomogeneous character of the laser electric field, in a form of Gaussian-shaped functions, leads to an unexpected relatio...
Article
Full-text available
Petawatt lasers are now available in a number of facilities around the world and are becoming a very useful tool in physics and engineering. Some of such lasers are able -or will be able soon- to fire at high repetition rates (one shot per second or more). Experiments at such repetition rates have certain peculiarities that are to be briefly expose...
Conference Paper
We studied high-order harmonic generation (HHG) through the three-step model, in gaseous phase atoms driven by plasmonic-enhanced fields. We have demonstrated that the spatial inhomogeneous and bounded character of the electric field, modeled by Gaussian-shaped functions, leads to an unexpected relationship between the HHG cutoff and the laser wave...
Poster
Full-text available
The real-time observation of electronic coherence phenomena induced by evolution of strongly coupled electronic excited states in isolated molecules typically requires sub-50 fs time resolution in the UV. For this purpose, the third harmonic generation (THG) in noble gases has been proved to be an admonitory solution to avoid the pulse dispersion e...
Conference Paper
Full-text available
The real-time observation of electronic coherence phenomena induced by evolution of strongly coupled electronic excited states in isolated molecules typically requires sub-50 fs time resolution in the UV. For this purpose, the third harmonic generation (THG) in noble gases has been proved to be an admonitory solution to avoid the pulse dispersion e...
Article
Full-text available
e-ASTROGAM (`enhanced ASTROGAM') is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV - the lower energy limit can be pushed to energies as low as 150 keV, albeit wi...
Article
Full-text available
Due to the bosonic nature of the photon, increasing the peak intensity through a combination of raising the pulse energy and decreasing the pulse duration will pile up more and more photons within the same finite region of space. In the absence of material, this continues until the vacuum is stressed to the point of breakdown and virtual particles...
Article
Full-text available
Laser-based sources of ionizing radiation have attracted a considerable attention in the last years for their broad potential applications. However the stability and robustness of such sources is still an issue that needs to be addressed. Aiming to solve such problems, we propose a source that uses a liquid jet -rather than a solid- as a target for...
Article
We report on benchmark tests of a 3 TW/50 fs, table-top laser system specifically developed for proton acceleration with an intrinsic pump rate up to 100 Hz. In two series of single-shot measurements differing in pulse energy and contrast the successful operation of the diode pumped laser is demonstrated. Protons have been accelerated up to 1.6 MeV...
Article
Laser accelerators have long been proposed as beam source for hadron therapy. However, the high energies necessary for the treatment of deep-lying tumours, combined with stringent requirements on the beam quality, are still a severe challenge. In the present work, we discuss the applicability of laser-accelerated carbon ions at moderate energies (1...
Poster
Full-text available
Laser wakefield acceleration (LWFA) can produce beams of energetic electrons in the range of a hundred of MeVs reaching, in some cases, the GeV regime . In addition the Betatron radiation generated by the transverse motion of the electrons in the LWFA represents nowadays a promising source of spatially coherent X-ray for a multiple direct applicati...
Poster
Full-text available
Warm dense matter (WDM, T~1-100 eV, ρ ~1-100 g/cm3) is encountered in numerous fields of research such as inertial confinement fusion, laboratory astrophysics or the modelling of planetary interiors. Numerous experiments have been carried out for generating and probing of WDM. The current experiment carried on at CLPU is concentrated on the measure...
Conference Paper
Full-text available
The results of commissioning experiments -- betatron radiation and protons acceleration from gaseous and solid targets -- at the petawatt user facility, Centro de Laseres Pulsados in Salamanca, Spain, are reviewed along with facility capabilities.
Chapter
This contribution reviews the different approaches for extreme laser facilities and their potential scientific and technical applications. In short, we can address two obvious questions, what extreme lasers can we build? and what are them good for?
Article
A design of a diode side-pumped Nd:YAG laser module and simulations of the gain distribution inside the active medium are presented in this paper. The code is based on a nonsequential ray-tracing Monte Carlo method for the light generated by the laser diodes. The fluorescence image of the active medium was analyzed in order to compare it with the s...
Article
In this letter we propose a complementary approach to extend the cutoff in high-order harmonic generation (HHG) spectra beyond the well established limits. Inspired by techniques normally used in the compression of ultrashort pulses and supercontinuum generation, we show this extension can be achieved by means of a nonlinear phenomenon known as sel...
Conference Paper
Full-text available
Background: The interaction of highly intense laser pulses with solid targets covers a wide range of phenomena over several orders of magnitude in laser intensity. Time-of-flight measurements provide an accurate reconstruction of the ion energy spectra. We report on the observation of aluminium ions from a laser-plasma interaction by a scintillator...
Article
Full-text available
Studies of strong field ionization have historically relied on the strong field approximation, which neglects all spatial dependence in the forces experienced by the electron after ionization. More recently, the small spatial inhomogeneity introduced by the long-range Coulomb potential has been linked to a number of important features in the photoe...
Article
Full-text available
In this work we present a modification to conventional X-rays fluorescence using electrons as excitation source, and compare it with the traditional X-ray excitation for the study of pigments. For this purpose we have constructed a laser-based source capable to produce X-rays as well as electrons. Because of the large penetration depth of X-rays, t...
Article
Full-text available
Recently two emerging areas of research, attosecond and nanoscale physics, have started to come together. Attosecond physics deals with phenomena occurring when ultrashort laser pulses, with duration on the femto- and sub-femtosecond time scales, interact with atoms, molecules or solids. The laser-induced electron dynamics occurs natively on a time...
Article
Full-text available
We present a theoretical study of high-order harmonic generation (HHG) driven by ultrashort optical pulses with different kind of chirps. The goal of the present work is perform a detailed study to clarify the relevant parameters in the chirped pulses to achieve a noticeable cut-off extensions in HHG. These chirped pulses are generated using both l...
Conference Paper
In this work we propose a new approach to extend the cutoff in high-order harmonic generation (HHG) spectra beyond the well established limits.We achieved this extension by using driven pulses obtained by means of self-phase-modulation (SPM).
Article
Full-text available
We present temporal information obtained by mass spectrometry techniques about the evolution of plasmas generated by laser filamentation in air. The experimental setup used in this work allowed us to study not only the dynamics of the filament core but also of the energy reservoir that surrounds it. Furthermore, valuable insights about the chemistr...
Poster
Full-text available
Recently a laser based Xray source has been developed in CLPU. This is the first based radioactive installation in Spain (License from the Spanish Nuclear Safety Council, IRA 3254). To generate the X-ray radiation, the laser is focalized on a metallic target (Copper) with intensities up to 10^16 W.cm^⁻2. At these intensities, electrons are extracte...
Article
Full-text available
We report the first pulsed laser operation of an Indium-modified Yb:KY(WO4)2 crystal. Indium incorporation enlarges the broadening of the Yb3+ optical bands, reduces crystal lattice parameters and increases np refractive index. A KY0.8In0.07Yb0.13(WO4)2 crystal pumped at 981 nm with a Ti-sapphire laser in a SESAM modulated resonator produces at 300...
Article
Full-text available
We present the first theoretical investigation of carrier-wave Rabi flopping in real atoms by employing numerical simulations of high-order harmonic generation (HHG) in alkali species. Given the short HHG cutoff, related to the low saturation intensity, we concentrate on the features of the third harmonic of sodium (Na) and potassium (K) atoms. For...
Article
Recientemente en el Centro de Láseres Pulsados (CLPU) se ha desarrollado una fuente de rayos X generada por láser para ponerla a disposición de los usuarios del centro siendo la primera instalación radioactiva basada en interacción láser-materia licenciada en España por el Consejo de Seguridad Nuclear (instalación radioactiva de tercera categoría I...
Book
This volume covers a broad range of topics focusing on atoms, molecules, and clusters interacting in intense laser field, laser induced filamentation, and laser plasma interaction and application. The PUILS series delivers up-to-date reviews of progress in Ultrafast Intense Laser Science, a newly emerging interdisciplinary research field spanning a...
Conference Paper
Full-text available
The Pulsed Laser Center (CLPU) is a new laser facility placed in Salamanca, Spain. Here, we present the lasers which CLPU will offer to its users community and the first experiments that are being prepared in the laser particle acceleration field. The CLPU will count with the VEGA laser. This is a Ti:Sapphire laser which has three outputs. The firs...
Article
We investigated the structural effects that ultrafast laser ablation has on RbTiOPO4 (RTP) single crystals. Raman scattering analysis revealed that a polycrystalline layer of RTP substituted the original material on the surface of the microstructured areas which is mainly responsible for the roughness observed in these structures. A later annealing...
Article
Full-text available
We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser intensity is increased. This fact contradicts the gen...
Conference Paper
We examine how the combination of temporal and spatial laser field synthesis results in a remarkable cutoff extension far beyond the conventional semi-classical limit. Our scheme allows coherent XUV photons generation beyond the carbon K-edge.
Conference Paper
We study theoretically the high order harmonic generation and photoelectron emission in gases using plasmonic enhanced near-fields. We demonstrate that these fields have a great potential to generate high energetic electrons and coherent photons.
Article
Full-text available
For high enough electromagnetic fields, such as those that can be achieved by ultra-intense laser pulses, light is expected to interact with light through the interchange of virtual particles. A rich phenomenology is then predicted to occur, such as the possible production of real electron-positron pairs for electromagnetic fields close enough to t...
Article
Full-text available
Fue allá por 1960 cuando Theodore Maiman construyó el primer láser sin otro fin que la mera curiosidad. Sin embargo, apenas 50 años después, aquel instrumento que llegó a califi- carse de “solución en busca de problemas” se ha convertido en una herramienta imprescindible en nuestra vida diaria. El láser está presente en cientos de aparatos, des...
Article
Full-text available
We study theoretically the photoelectron emission in noble gases using plasmonic enhanced near-fields. We demonstrate that these fields have a great potential to generate high energy electrons by direct mid-infrared laser pulses of the current femtosecond oscillator. Typically, these fields appear in the surroundings of plasmonic nanostructures, ha...