Pulses with a twist and torque Structured light beams can serve as vortex carrying optical angular momentum have been used to enhance communications imaging. Rego et al. generated dynamic pulses by interfering two incident time-delayed different orbital momenta through the process of high harmonic generation. A controlled time delay between allowed extreme-ultraviolet beam exhibit time-dependent momentum, called self-torque. Such could potentially be manipulate nanostructures atoms on...

We present a theoretical study of high-order harmonic generation (HHG) and propagation driven by an infrared field carrying orbital angular momentum (OAM). Our calculations unveil the following relevant phenomena: extreme-ultraviolet vortices are generated survive to effects, transport high-OAM multiples corresponding OAM driving and, finally, different emitted with similar divergence. also show possibility combining HHG phase locking produce attosecond pulses helical pulse structure.

High-order harmonic generation (HHG) has been recently proven to produce extreme-ultraviolet (XUV) vortices from the nonlinear conversion of infrared twisted beams. Previous works have demonstrated a linear scaling law vortex charge with order. We demonstrate that this simple hides an unexpectedly rich scenario for buildup orbital angular momentum (OAM) due nonperturbative behavior HHG. The complexity these XUV beams appears only when HHG is driven by nonpure modes, where OAM content...

Vector beams, beams with a non-uniform state of polarization, have become an indispensable tool in many areas science and technology.Harnessing topological light properties paves the way to control manipulate light-matter interactions at different levels, from quantum macroscopic physics.Here we generate tabletop extreme ultraviolet (EUV) vector driven by high-order harmonic generation (HHG).Our experimental theoretical results demonstrate that HHG imprints polarization fundamental...

High-order harmonic generation (HHG) driven by beams carrying orbital angular momentum has been recently demonstrated as a unique process to generate spatio-temporal coherent extreme ultraviolet (XUV)/x-ray radiation with attosecond helical structure. We explore the details of mapping driving vortex its spectrum. In particular we show that geometry vortices is complex, arising from superposition contribution short and long quantum paths responsible HHG. Transversal phase-matching path...

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...

The extreme nonlinear optical process of high-harmonic generation (HHG) makes it possible to map the properties a laser beam onto radiating electron wave function and, in turn, emitted x-ray light. Bright HHG beams typically emerge from longitudinal phased distribution atomic-scale quantum antennae. Here, we form transverse necklace-shaped array linearly polarized emitters, where orbital angular momentum conservation allows us tune line spacing and divergence ultraviolet soft combs. on-axis...

Abstract Linearly polarized vector beams are structured lasers whose topology is characterized by a well-defined Poincaré index, which topological invariant during high-order harmonic generation. As such, harmonics produced as extreme-ultraviolet that inherit the of driver. This holds for isotropic targets such noble gases, but analogous behaviour in crystalline solids still open to discussion. Here, we demonstrate this conservation rule breaks solids, virtue their anisotropic non-linear...

We propose a novel method to reconstruct the spatio-temporal amplitude and phase of electric field ultrashort laser pulses using spatially-resolved spectral interferometry. This is based on fiber-optic coupler interferometer that has certain advantages in comparison with standard systems, such as it being alignment-free selection reference beam at single point. Our technique, which we refer STARFISH, offers compactness simplicity. report its application experimental characterization chirped...

Abstract We investigate theoretically the generation of extreme-ultraviolet (EUV) beams carrying fractional orbital angular momentum. To this end, we drive high-order harmonic with infrared conical refraction (CR) beams. show that emitted in EUV/soft x-ray regime preserve characteristic signatures driving beam, namely ringlike transverse intensity profile and CR-like polarization distribution. As a result, through spin momentum conservation, are momentum, they can be synthesized into...

Vortex light beams are structures of the electromagnetic field with a spiral phase ramp around point-phase singularity. These vortices have many applications in optical regime, ranging from trapping and quantum information to spectroscopy microscopy. The extension into extreme-ultraviolet (XUV)/X-ray regime constitutes significant step forward bring those nanometer or even atomic scale. recent development new generation X-ray sources, refinement other techniques, such as harmonic generation,...

High-order harmonic generation stands as a unique nonlinear optical up-conversion process, mediated by laser-driven electron recollision mechanism, which has been shown to conserve energy, momentum, and spin orbital angular momentum. Here we present theoretical simulations demonstrate that this process also conserves mixture of the latter, torus-knot momentum $J_\gamma$, producing high-order harmonics with driving pulses are invariant under coordinated rotations. We charge $J_\gamma$ emitted...

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...

Abstract A new physically adsorbed capillary coating for electrophoresis‐mass spectrometry (CE‐MS) of basic proteins is presented, which easily obtained by flushing the with a polymer aqueous solution two min. This significantly reduces electrostatic adsorption group ( i.e. , cytochrome c, lysozyme, and ribonuclease A) onto wall allowing their analysis CE‐MS. The protocol compatible electrospray inonization (ESI)‐MS via reproducible separation standard (%RSD values n = 5) < 1% time...

Intense few- and single-cycle pulses are powerful tools in different fields of science Today, third- higher-order terms the remnant spectral phase remain a major obstacle for obtaining high-quality from in-line post-compression setups. In this Letter, we show how input pulse shaping can successfully be applied to standard setups minimize occurrence high-order components during nonlinear propagation directly obtain with durations down 3 fs. Furthermore, by combining new-generation broadband...

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...

We present a detailed numerical study of ultrashort pulse compression using three-stage hybrid all-bulk multipass cell scheme. By operating in the enhanced frequency chirp regime, we achieve pulses from around 180 fs to 4 duration (a total factor above 45), with side lobes contributing intensity values lower than 0.2 % peak intensity. Optimal conditions for regime propagation have been identified, enabling smooth spectral broadening and high-quality temporal profiles. The first two stages...

We demonstrate for the first time that input polarisation control inducing one single filamentation is a very robust technique to accurately dynamics enhancing throughput energy of supercontinuum generation up 1.2 millijoule. Reaching above-millijoule regime opens way post-compression multi-terawatt laser pulses.

Self-compressed (SC) pulses have been achieved through the filamentation process in air without any additional dispersion compensation, using input pulse chirp as control parameter. For studied energy (3-5 mJ), we found two opposite sign group-delay values for which SC can be systematically. In addition, observed that coupled into inner core of filament is always order 20% total energy, opens way to a scalable technique obtain intense short directly from process.

The dynamics of a driven electron wavepacket are studied for very high laser intensities. study is based on superposition large number relativistic Volkov states. For intensities, the magnetic component field induces significant drift in motion as well squeezing wavepacket.

Soliton self-compression is demonstrated during the propagation of high spatial modes in hollow core fibers near-infrared spectral region, taking advantage their negative dispersion response. We have found that there always an optimum mode to observe this phenomenon, compressing pulses down single-cycle regime without needing any external compression device and with a consequent increase output peak power. Our result relevant for ultrashort laser application which few- or are crucial.