Trains of attosecond pulses structured with time-ordered polarization states

Rego, Laura; Román, Julio San; Plaja, Luis; Hernández-García, Carlos

doi:10.1364/ol.404402

Cited by 12 publications

(11 citation statements)

References 29 publications

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“…To verify these predictions, we performed full quantum HHG simulations including propagation using the electromagnetic field propagator ( 49 ) (see Methods), a method that was used in several previous calculations of HHG involving OAM ( 20 , 21 , 37 , 40 , 43 ). In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…OAM manifests itself as a variation of the beam's spatial phase along its transverse profile, and it is characterized by its topological charge, ℓ, or number of 2 phase twists along the azimuthal coordinate (34,35). Since the first experiments in 2012 (36), OAM-driven HHG has proven to be a powerful tool for shaping the spatial properties of higher-order harmonics-including the topological charge, intensity distribution (37)(38)(39)(40)(41)(42), and polarization properties (20,43). OAM can also be used to control the temporal shape of HHG-through the generation of helical attosecond pulses (37,39) or high harmonics with an OAM that increases during the pulse, which is a unique capability of HHG light (21).…”

Section: Introductionmentioning

confidence: 99%

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Necklace-structured high-harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing

et al. 2022

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The extreme nonlinear optical process of high-harmonic generation (HHG) makes it possible to map the properties of a laser beam onto a radiating electron wave function and, in turn, onto the emitted x-ray light. Bright HHG beams typically emerge from a longitudinal phased distribution of atomic-scale quantum antennae. Here, we form a transverse necklace-shaped phased array of linearly polarized HHG emitters, where orbital angular momentum conservation allows us to tune the line spacing and divergence properties of extreme ultraviolet and soft x-ray high-harmonic combs. The on-axis HHG emission has extremely low divergence, well below that obtained when using Gaussian driving beams, which further decreases with harmonic order. This work provides a new degree of freedom for the design of harmonic combs—particularly in the soft x-ray regime, where very limited options are available. Such harmonic beams can enable more sensitive probes of the fastest correlated charge and spin dynamics in molecules, nanoparticles, and materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Necklace-structured high-harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing

et al. 2022

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“…In the last decade, structured vortex light has been successfully applied to drive highly non-linear interactions in matter, such as structured high-order harmonic generation (HHG), leading to the creation of ultrashort structured pulses in the extremeultraviolet domain [25][26][27][28][29][30][31][32][33][34][35] . An interesting aspect of this capacity to structure the HHG radiation is that it allows us to spatially separate harmonics radiation with different properties, enabling control over the polarization of ultrashort pulses 35,36 or their spectral content 37 .…”

Section: Introductionmentioning

confidence: 99%

Structuring the local handedness of synthetic chiral light: global chirality versus polarization of chirality

Rego

Ayuso

2022

Preprint

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Synthetic chiral light enables ultrafast and highly efficient imaging of molecular chirality. Unlike standard circularly polarized light, the handedness of synthetic chiral light does not rely on the spatial structure of the light field: it is encoded locally, in the chiral trajectory that the tip of the electric-field vector draws in time, at each point in space. Being locally chiral, already within the electric-dipole approximation, synthetic chiral light is a highly efficient chiral photonic reagent. Synthetic chiral light that is locally and globally chiral allows us to selectively quench the nonlinear response of a selected molecular enantiomer while maximizing it in its mirror twin at the level of total signal intensities. Synthetic chiral light that exhibits polarization of chirality allows us to realize a chiral version of Young’s double-slit experiment that leads to enantio-sensitive light bending. Here we connect these two new concepts and show how one can structure the local and global handedness of synthetic chiral light in space, and how these local and global properties are imprinted in the enantio-sensitive response of the chiral molecules, creating new opportunities for ultrafast, all-optical and highly efficient imaging of molecular chirality.

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“…On the macroscopic level, when the emitted radiation from a large number of individual atoms is phase-matched, the HHG allows mapping certain characteristics of the driving beam into the harmonic radiation. Exploiting the field-driven coherent nature of the HHG process, long-wavelength structured-beam driven HHG in noble gases has made long strides, enabling control and manipulation of OAM and/or SAM in the extreme-ultraviolet (EUV) spectral range [18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Extreme-ultraviolet structured beams via high harmonic generation

Pandey¹,

Heras²,

Román³

et al. 2022

Preprint

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Vigorous efforts to harness the topological properties of light have enabled a multitude of novel applications. Translating the applications of structured light to higher spatial and temporal resolutions mandates their controlled generation, manipulation, and thorough characterization in the short-wavelength regime. Here, we resort to high-order harmonic generation (HHG) in a noble gas to upconvert nearinfrared (IR) vector, vortex, and vector-vortex driving beams that are tailored respectively in their Spin Angular Momentum (SAM), Orbital Angular Momentum (OAM), and simultaneously in their SAM and OAM. We show that HHG enables the controlled generation of extreme-ultraviolet (EUV) vector beams exhibiting various spatially-dependent polarization distributions, or EUV vortex beams with a highly twisted phase. Moreover, we demonstrate the generation of EUV vector-vortex beams (VVB) bearing combined characteristics of vector and vortex beams. We rely on EUV wavefront sensing to unambiguously affirm the topological charge scaling of the HHG beams with the harmonic order. Interestingly, our work shows that HHG allows for a synchronous controlled manipulation of SAM and OAM. These EUV structured beams bring in the promising scenario of their applications at nanometric spatial and sub-femtosecond temporal resolutions using a table-top harmonic source.

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Trains of attosecond pulses structured with time-ordered polarization states

Cited by 12 publications

References 29 publications

Necklace-structured high-harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing

Necklace-structured high-harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing

Structuring the local handedness of synthetic chiral light: global chirality versus polarization of chirality

Extreme-ultraviolet structured beams via high harmonic generation

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