Attosecond
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Attosecond pulse trains from graphene via macroscopic phase-matching in high harmonic generation
arXiv:2606.03945v1 Announce Type: new Abstract: Attosecond pulse generation in solids remains challenging due to the complex phase structure arising from multiple electronic pathways in high harmonic generation (HHG). Here, we identify the macroscopic conditions that enable the synthesis of attosecond pulse trains in graphene via HHG. Using numerical simulations that combine microscopic and macroscopic HHG in single-layer graphene, we show that harmonic contributions associated with...
Attosecond Compression of Relativistic Electron Pulses via Continuous Harmonic Undulator Resonance
arXiv:2605.31083v1 Announce Type: new Abstract: Extending megaelectronvolt ultrafast electron diffraction (MeV UED) into the attosecond regime is essential for resolving intrinsic structural dynamics, yet requires simultaneously controlling electron-pulse duration and arrival-time stability. Here, we propose a generalized harmonic laser-electron interaction that extends beam modulation into a continuous harmonic regime. We demonstrate that highly detuned, non-integer harmonic modulation via...
Rainbow RABBITT as a Probe of Coherent Rabi Dynamics
Announce Type: new Abstract: Attosecond pulse trains interacting with a resonantly dressed atom generate a pronounced intra-sideband phase structure that remains hidden in conventional spectrally integrated RABBITT measurements. Using \textit{ab initio} time-dependent Schr\"odinger equation calculations for lithium near the resonant $2s\to2p$ transition, we show that the phase extracted within a single sideband can vary by nearly $\pi$ across its spectral width.
Toroidal pulse enhanced XUV generation
arXiv:2605.31428v1 Announce Type: new Abstract: Extreme ultraviolet (XUV) radiation plays a central role in a wide range of applications. Despite being a cornerstone of attosecond science, efficient XUV generation remains highly challenging. Here, we investigate XUV generation via nonlinear Thomson scattering driven by a toroidal pulse.
Quantum light gives a 20-fold boost to ultrafast laser processes
May 30, 2026 report Quantum light gives a 20-fold boost to ultrafast laser processes Sam Jarman Author Gaby Clark Scientific Editor Robert Egan Associate Editor Nonlinear interactions between light and matter are at the heart of some of the most powerful tools in modern optics, but pushing these processes to their limits has long been hampered by a fundamental constraint: the stronger you make the laser, the more likely it is to destroy whatever it illuminates. Through new experiments...
Sub-cycle field-driven dynamical Berry phase in solids
Announce Type: cross Abstract: In quantum mechanics, a wavepacket acquires a geometric phase, known as the Berry phase, as it evolves along a closed trajectory in parameter space. In condensed matter systems, the Berry phase underlies a broad range of phenomena, including the anomalous Hall effect, orbital magnetism, and electric polarization. However, in centrosymmetric materials possessing time-reversal (TR) symmetry, its manifestation is suppressed and effectively vanishes.