A5072304499- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Advanced X-ray Imaging Techniques
- Spectroscopy and Quantum Chemical Studies
- Quantum optics and atomic interactions
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric and Environmental Gas Dynamics
- Near-Field Optical Microscopy
- Laser-induced spectroscopy and plasma
- Photorefractive and Nonlinear Optics
- Fluid Dynamics and Turbulent Flows
- Magnetic properties of thin films
- Cold Atom Physics and Bose-Einstein Condensates
- Meteorological Phenomena and Simulations
Universidad de Salamanca
2022-2024
One of the main constraints for reducing temporal duration attosecond pulses is attochirp inherent to process high-order harmonic generation (HHG). Though can be compensated in extreme-ultraviolet using dispersive materials, this unfeasible toward x-rays, where shortest or even sub-attosecond could obtained. We theoretically demonstrate that HHG driven by a circularly polarized infrared pulse while assisted an strong oscillating ultrafast intense magnetic field enables few-cycle...
We theoretically and experimentally demonstrate the generation of high-topological charge, extreme-ultraviolet (EUV) spatiotemporal optical vortices (STOV) from high-order harmonic generation. EUV-STOVs are unique structured light tools for exploring ultrafast topological laser-matter interactions.
The concept of critical ionization fraction has been essential for high-harmonic generation, because it dictates the maximum driving laser intensity while preserving phase matching harmonics. In this work, we reveal a second, nonadiabatic fraction, which substantially extends phase-matched harmonic energy, arising strong reshaping intense field in gas plasma. We validate understanding through systematic comparison between experiment and theory wide range conditions. particular, properties...
Abstract Ultrafast laser pulses provide unique tools to manipulate magnetization dynamics at femtosecond timescales, where the interaction of electric field usually dominates over magnetic field. Recent proposals using structured beams have demonstrated possibility produce regions intense oscillating fields are isolated from In these conditions, we show that technologically feasible tesla-scale circularly polarized high-frequency induce purely precessional nonlinear dynamics. This...
Structured light provides unique opportunities to spatially tailor the electromagnetic field of laser beams. These include possibility a sub-wavelength spatial separation their electric and magnetic fields, which would allow isolating interactions matter with pure (or electric) fields. This could be particularly interesting in molecular spectroscopy, as excitations due and—usually very weak—magnetic transition dipole moments can disentangled. In this work, we show that use tailored metallic...
<title>Abstract</title> Spatiotemporal optical vortices (STOV) are structured light pulses with a unique topology that couples the spatial and temporal domains. Up to now, their generation has been limited low-order topological charges in visible infrared regions of spectrum. During last decade, it was shown through process high-order harmonic (HHG) is possible up-convert from near-infrared into extreme-ultraviolet (EUV), thereby producing distinct femtosecond attosecond structure. In this...
Structured light provides unique opportunities to spatially tailor the electromagnetic field of laser beams. This includes possibility a sub-wavelength spatial separation their electric and magnetic fields, which would allow isolating interactions matter with pure (or electric) fields. could be particularly interesting in molecular spectroscopy, as excitations due -- usually very weak transition dipole moments can disentangled. In this work, we show that use tailored metallic nanoantennas...
The ability to spatially separate the electric and magnetic fields of a light beam enables inspection laser-matter interactions driven solely by optical fields. However, field excitations are commonly orders magnitude weaker than those field. Several studies have already demonstrated isolation an intense, linearly polarized using structured light. In this work, we report generation isolated high intensity with controlled polarization state in non-paraxial regime laser beams. Our theoretical...
The ability to spatially separate the electric and magnetic fields of a light beam enables inspection laser–matter interactions driven solely by optical fields. However, field excitations are commonly orders magnitude weaker than those field. Several studies have already demonstrated isolation an intense, linearly polarized using structured light. In this work, we report generation isolated high intensity with controlled polarization state in non-paraxial regime laser beams. Our theoretical...
Spatiotemporal (STOV) and spatiospectral (SSOV) optical vortices are unique structured light tools for exploring ultrafast laser-matter interactions. We theoretically experimentally study the high-topological charge extreme-ultraviolet/attosecond regime STOV SSOV generation through high-order harmonic generation.
Spatiotemporal optical vortices (STOV) are space-time structured light pulses with a unique topology that couples spatial and temporal domains carry transverse orbital angular momentum (OAM). Up to now, their generation has been limited the visible infrared regions of spectrum. During last decade, it was shown through process high-order harmonic (HHG) is possible up-convert longitudinal OAM from near-infrared into extreme-ultraviolet (EUV), thereby producing distinct femtosecond attosecond...
Ultrafast laser pulses provide unique tools to manipulate magnetization dynamics at femtosecond timescales, where the interaction of electric field -- such as excitation spin carriers non-equilibrium states, generation localized charge currents, demagnetization, or inverse Faraday effect dominates over magnetic field. Recent proposals using structured beams have enlightened possibility generate intense fields, spatially isolated from Here we demonstrate relevance this novel scenario...
Much of our knowledge about fundamental properties atoms and molecules on the microscopic scale is result spectroscopy. The molecular response that detected by optical spectroscopic techniques dominated interaction between electric field component light (transition) dipole (ED) moment because analogous magnetic intrinsically orders magnitude weaker. Nevertheless, (MD) transitions are strong interest, as they follow different selection rules compared to ED allow extracting complementary...
Attosecond (as) pulse generation is temporally constrained by the attochirp inherent to high-order harmonic (HHG) process. In extreme ultraviolet, near Fourier-limited as-pulses are obtained compensating using dispersive materials like metallic filters. The shortest as-pulse record used a Zr-filter compress down just 43 as [1]. However, at soft x-rays regime, chirp compensation optics inefficient and of pulses has become great challenge. We identify promising scenario suppress assisting HHG...
The technological refinements on high-power laser systems of Petawatt class unveil scenarios for light-matter interaction beyond the laser-plasma perspective. In this contribution we explore possibility assisting high-harmonic generation (HHG) with strong magnetic field associated one those intense sources. Recently, there has been an interest in developing schemes to employ beams define spatial volumes which fields are found isolated from electric field. conditions, can be used assist...
Extending the photon energy range of bright high-harmonic generation to cover entire soft X-ray region is important for many applications in science and technology. The concept critical ionization fraction has been essential, because it dictates maximum driving laser intensity that can be used while preserving harmonic emission. In this work, we reveal a second, nonadiabatic substantially extends phase-matched energy, arises due strong reshaping intense field. We validate understanding...
After more than two decades of attosecond physics, the generation and control shortest laser pulses available remains as a complex task. One main limitations reducing temporal duration emitted from high-order harmonic (HHG) is attochirp . In this contribution, we demonstrate that HHG assisted by strong fast oscillating magnetic fields enables Fourierlimited in water window. short, field generates nanowire-like structure, which transversally confines electronic wavefunction process. We...