A5009070793- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Advanced X-ray Imaging Techniques
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Laser Design and Applications
- Conferences and Exhibitions Management
- Optical and Acousto-Optic Technologies
- Nonlinear Waves and Solitons
- Mechanical and Optical Resonators
- Virtual Reality Applications and Impacts
- Cellular Mechanics and Interactions
- Spacecraft Dynamics and Control
- Microtubule and mitosis dynamics
- Diversity and Career in Medicine
- Digital Holography and Microscopy
- Digital Imaging in Medicine
Universidad de Salamanca
2020-2024
Structured light in the short-wavelength regime opens exciting avenues for study of ultrafast spin and electronic dynamics. Here, we demonstrate theoretically experimentally generation vector-vortex beams (VVB) extreme ultraviolet through high-order harmonic (HHG). The up-conversion VVB, which are spatially tailored their orbital angular momentum, is ruled by conservation topological Pancharatnam charge HHG. Despite complex propagation driving beam, high-harmonic VVB robustly generated with...
Recent developments of high harmonic generation (HHG) have enabled the production structured extreme-ultraviolet (EUV) ultrafast laser beams with orbital angular momentum (OAM). Precise manipulation and characterization their spatial structure are paramount for application in state-of-the-art studies. In this work, we report EUV vortex bearing a topological charge as 100. Thanks to OAM conservation, HHG noble gases offers unique opportunity generate from low infrared beams. A high-resolution...
The landscape of ultrafast structured light pulses has significantly advanced thanks to the ability high-order harmonic generation (HHG) translate spatial properties infrared laser beams extreme-ultraviolet (EUV) spectral range. In particular, up-conversion orbital angular momentum (OAM) enabled harmonics whose OAM scales linearly with order and topological charge driving field. Having a well-defined OAM, each is emitted as an EUV femtosecond vortex pulse. However, order-dependent across...
The use of structured light to drive highly nonlinear processes in matter not only enables imprinting spatially-resolved properties onto short-wavelength radiation, but also opens alternative avenues for exploring the dynamics laser-matter interactions. In this work, we experimentally and theoretically explore unique driving high-order harmonic generation (HHG) with Hermite-Gaussian beams. HHG driven by Laguerre-Gauss modes results harmonics that inherit azimuthal modal structure, their...
In the rapidly evolving field of structured light, self-torque has been recently defined as an intrinsic property light beams carrying time-dependent orbital angular momentum. particular, extreme-ultraviolet (EUV) with self-torque, exhibiting a topological charge that continuously varies on subfemtosecond time scale, are naturally produced in high-order harmonic generation (HHG) when driven by two time-delayed intense infrared vortex different charges. Until now, polarization state such EUV...
The COVID pandemic is forcing the renewal of scientific conferences, offering opportunities to introduce technological and inclusive developments. Our analysis focuses on implementation practices for female early-career researchers in a virtual conference. This organization approach was applied XIII Spanish Optical Meeting (RNO2021), which also characterized by avatars interacting an online metaverse. effectiveness policies novel tools evaluated using participation data post-conference...
This paper reports a back-reaction mechanism in multielectron correlation dynamics of helium atoms irradiated by strong laser fields. The signature high harmonic spectroscopy is secondary plateau high-order harmonics extending the emission towards higher frequencies, beyond standard cut-off frequency.
Coherent control over electron dynamics in atoms and molecules using high-intensity circularly polarized laser pulses gives rise to current loops, resulting the emission of magnetic fields. We propose, demonstrate with ab initio calculations, "current-gating" schemes generate direct or alternating-current infrared spectral region, highly tunable waveform frequency, showing femtosecond-to-attosecond pulse duration. In optimal conditions, can be isolated from driving exhibits a high flux...
Unconscious perceptions and decisions are influenced by gender bias. In this work, we provide an exhaustive data analysis of the Ph.D. theses defended in field optics photonics Spain filtering key descriptors gender. Our results show a severe underrepresentation women stage community, which becomes even more prominent technological theoretical domains. The gap is reduced biomedical visual optics. This asymmetry symptom bias science associated with traditional stereotypes about health social...
The landscape of ultrafast structured light pulses has recently evolved driven by the capability high-order harmonic generation (HHG) to up-convert orbital angular momentum (OAM) from infrared extreme-ultraviolet (EUV) spectral regime. Accordingly, HHG been proven produce EUV vortex at femtosecond timescale. Here we demonstrate attosecond pulse trains, i.e. a succession with helical wavefront, resulting synthesis comb harmonics same OAM. By driving polarization tilt-angle fork grating, two...
High-order harmonic generation driven by intense extreme ultraviolet (EUV) fields merges quantum optics and attosecond science, giving rise to an appealing route for the of coherent EUV soft X-ray light high-resolution imaging spectroscopies. We theoretically investigate ultrafast resonant dynamics during interaction He atoms with strong pulses. At high driving intensities, we identify record fast Rabi oscillations imprinting observable signatures in spectrum. field strengths suppressing...
In the rapidly evolving field of structured light, self-torque has been recently defined as an intrinsic property light beams carrying time-dependent orbital angular momentum. particular, extreme-ultraviolet (EUV) with -- exhibiting a topological charge that continuously varies on subfemtosecond timescale are naturally produced in high-order harmonic generation (HHG) when driven by two time-delayed intense infrared vortex different charges. Until now, polarization state such EUV restricted...
High harmonic generation (HHG) stands as one of the most complex processes in strong-field physics, it enables conversion laser light from infrared to extreme-ultraviolet or even soft x-rays, enabling synthesis and control pulses lasting short tens attoseconds. Accurately simulating this nonlinear non-perturbative phenomena requires coupling dynamics laser-driven electronic wavepackets, described by three-dimensional time-dependent Schrödinger equation (3D-TDSE), with macroscopic Maxwell’s...
High-harmonic generation (HHG) is an extreme nonlinear optical process that can map the properties of infrared driving laser beam onto short wavelength attosecond pulse trains. However, current techniques for generating circularly polarized high harmonics probing magnetic materials and chiral systems have limitations: two-color collinear counter-rotating lasers result in a low cutoff photon energy, while single-color noncollinear schemes suffer from conversion efficiency. In this work, we...
The prominent progress in the development of high-intensity extreme ultraviolet (EUV) coherent light sources enables exploration a novel regime nonlinear optical interactions and attosecond metrology driven by short-wavelength pulses [1]–[3]. Here, we theoretically demonstrate presence ultrafast resonant two-state dynamics EUV optics phenomena, where driving-laser photon energies are close to atomic transitions intense field induces ionization. We observe, for first time, distinctive...
This contribution reports the organization and celebration after Covid-19 pandemic of a singular scientific conference focused on early-career researchers from Spanish universities Santiago de Compostela Salamanca: “I Northwest Meeting Young Researchers in Optics (I NW MYRO)”.
The advent of intense coherent XUV sources opens up a novel regime extreme nonlinear light-mater interactions. We theoretically identify attosecond resonant dynamics in high harmonic generation driven by pulses, leading to efficient X-ray emission.
With widespread applications in optical trapping, super-resolution microscopy, quantum communications & information, and material processing, there is an ever-mounting interest the generation characterization of light beams carrying topological singularities [1] . An emblematic situation this singular-optics Laguerre-Gauss laser modes presenting azimuthal phase dependence: φ(r,θ)=l θ [2] The integer l also called charge singularity, number 2π shifts along coordinate beam. This structure...
Optical vortex and vector beams are two paradigmatic examples of structured light. While the first ones carry orbital angular momentum (OAM), thus their wavefront spirals along propagation direction, second present spatially inhomogeneous distributions polarization. Harnessing light is opening new perspectives in communications, quantum information, processing, high-resolution imaging, or particle trapping. Among them, generation coherent extreme-ultraviolet (EUV)/soft x-ray regime high...
Using multiplexed broadband ptychography (MBP), we characterize the EUV light in high-order harmonic generation (HHG). MBP can measure spectrally resolved complex beam profiles for different outputs without spectral dispersion. Through a simple change to experimental setup, also driving laser process. The experimentally measured profile is used an SFA+ with dipole approximation simulation of high generation. simulated results are compared harmonics produced characterized laser. By...
The generation of circularly polarized (CP) attosecond pulses is demanding and complicated to achieve, especially in the x-rays where standard polarization converters are highly inefficient. During last decade, sophisticated configurations high harmonic (HHG) have provided different alternatives generate CP high-order harmonics extreme ultraviolet regime [1], [2]. Among these techniques, only use a noncollinear scheme [3] has been able spatially separate with same helicity, thus provide [4]....
Coherent control over electron dynamics in atoms and molecules using high-intensity circularly-polarized laser pulses gives rise to current loops, resulting the emission of magnetic fields. We propose demonstrate with ab-initio calculations ``current-gating" schemes generate direct or alternating-current infrared spectral region, highly tunable waveform frequency, showing femtosecond-to-attosecond pulse duration. In optimal conditions, can be isolated from driving exhibits a high flux...
We demonstrate a new scheme for high harmonic generation driven by 2- lobe Hermite-Gaussian mode. The passive approach allows combining spectroscopy and interferometry to retrieve the nonlinear dynamics of process.
We observe experimentally, for the first time to our knowledge, a secondary plateau in UV-driven high harmonic generation X-ray regime, extending conventional cutoff from 130 eV 300 eV, due emission of single photon at double recombination highly-correlated electrons helium atoms. Intense 400 nm UV laser pulses, with duration 28 fs and energies up 2.8 mJ 1 kHz, derived through second upconversion Ti:Sapphire amplifier, are used drive inside gas-filled hollow waveguide (Fig. 1A). Bright...