arXiv subjects

Carles Serrat

Publications and source records attributed to Carles Serrat.

7 recordsLinked to original sources

arXiv2026

Train-Resolved Statistical Recovery of Weak SAXS Signals in Liquids at the European XFEL

We present a train-resolved SAXS methodology for recovering weak scattering signals from high-repetition-rate XFEL datasets and apply it to aqueous L-cysteine solutions measured at the European XFEL. Independent scale-plus-offset fitting was performed for matched cysteine and water train pairs, followed by subtraction of transmission-matched water--water controls. The 0.5 M dataset reveals a reproducible sign-changing residual SAXS signal that increases with incident XFEL transmission and remains after removal of detector-wide scaling, additive offsets, and matched water--water control residuals. Convergence and block-averaging analyses show that the residual emerges progressively as independent train pairs are accumulated and exhibits uncertainty scaling close to the expected inverse square-root dependence on N. These results establish a statistically robust transmission-dependent residual SAXS contribution whose microscopic origin remains unresolved, while demonstrating that train-resolved observables combined with matched controls can substantially improve sensitivity to weak scattering signals in high-repetition-rate XFEL experiments.

physics.optics↗

arXiv2026

Resonant X-Ray Difference-Frequency Seeding of Inner-Shell X-Ray Lasers

We analyze a class of inner-shell x-ray laser systems in which the initial conditions of the emission are set by a resonant x-ray difference-frequency drive. Using a microscopic density-matrix framework, we show that two coherent x-ray fields at frequencies $\omega_1$ and $\omega_2$, with $\omega_1-\omega_2=\omega_0$, can induce a phase-locked coherence on a core-level transition at $\omega_0$ without requiring an external field or nonlinear susceptibility at that frequency. In the presence of population inversion, this driven coherence sets the phase and temporal onset of the amplified field, while gain remains governed by conventional inner-shell lasing mechanisms. We refer to this operating regime as a resonant x-ray difference-frequency laser (re-XDFL). The analysis demonstrates that difference-frequency-driven coherence provides a physically consistent route to controlled inner-shell x-ray laser emission beyond purely ASE-initiated operation.

physics.atom-ph↗

arXiv2026

Spin waves excited by hard x-ray transient gratings

Recent progress in ultrafast x-ray sources helped establish x-rays as an important tool for probing lattice and magnetic dynamics initiated by femtosecond optical pulses. Here, we explore the potential of ultrashort hard x-ray pulses for driving magnetic dynamics. We use a transient grating technique in which a spatially periodic x-ray excitation pattern gives rise to material excitations at a well-defined wave vector, whose dynamics are monitored via diffraction of an optical probe pulse. The excitation of a ferrimagnetic gadolinium bismuth iron garnet film placed in an external tilted magnetic field by x-rays at the Gd L3 edge results in both magnetic and non-magnetic transient gratings whose contributions to the diffracted signal are separated by polarization analysis. We observe the magnetization precession at both longitudinal acoustic and spin wave frequencies. An analysis with the Landau-Lifshitz-Gilbert equation indicates that the magnetization precession is driven by strain resulting from thermal expansion induced by absorbed x-rays. The results establish x-ray transient gratings as a tool for driving coherent phonons and magnons, with the potential of accessing wave vectors across the entire Brillouin zone.

physics.optics↗

arXiv2015

Avalanche effect and gain saturation in high harmonic generation

Optical amplifiers in all ranges of the electromagnetic spectrum exhibit two essential characteristics: i) the input signal during the propagation in the medium is multiplied by the avalanche effect of the stimulated emission to produce exponential growth and ii) the amplification saturates at increasing input signal. We demonstrate that the strong-field theory in the frame of high harmonic generation fully supports the appearance of both the avalanche and saturation effects in the amplification of extreme ultraviolet attosecond pulse trains. We confirm that the amplification takes place only if the seed pulses are perfectly synchronized with the driving strong field in the amplifier. We performed an experimental study and subsequent model calculation on He gas driven by intense 30-fs-long laser pulses, which was seeded with an attosecond pulse train at 110 eV generated in a separated Ne gas jet. The comparison of the performed calculations with the measurements clearly demonstrates that the pumped He gas medium acted as an amplifier of the extreme ultraviolet pulse train.

physics.optics↗

arXiv2009

Quasi phase matching for high order harmonic generation induced by the carrier-envelope phase

We report a novel quasi-phase matching technique for high-order harmonic generation in low-density gases. Numerical simulations show that in few-optical cycle pulsed Bessel beams it is possible to control the pulse envelope and phase velocities which in turn allows to control the carrier-envelope phase during propagation. The resulting oscillations in the peak intensity allow to phase-match the high-order harmonic generation process with a nearly two decade enhancement in the XUV power spectrum.

physics.atom-ph↗

arXiv2005

Quantum control of optical four-wave mixing with femtosecond w-3w laser pulses: coherent ac Stark nonlinear spectroscopy

The four-wave mixing produced with two ultrashort phase-locked w-3w laser pulses propagating coherently in a two-level system in the infrared spectral region is shown to depend on the pulses relative phase. The Maxwell-Bloch equations are solved beyond the rotating-wave approximation to account for field frequencies which are largely detuned from the atomic resonance. The relative phase dominating the efficiency of the coupling to the 5w anti-Stokes Raman component is determined by sign of the total ac Stark shift induced in the system, in such a way that the phase influence disappears precisely where the ac Stark effect due to both pulses is compensated. This fundamental quantum interference effect can be the basis for nonlinear ultrafast optical spectroscopy techniques.

physics.optics↗

arXiv2004

Coherent control of optical four-wave mixing by two-color $ω$-$3ω$ ultrashort laser pulses

A theoretical investigation on the quantum control of optical coherent four-wave mixing interactions in two-level systems driven by two intense synchronized femtosecond laser pulses of central angular frequencies $ω$ and $3ω$ is reported. By numerically solving the full Maxwell-Bloch equations beyond the slowly-varying envelope and rotating-wave approximations in the time domain, the nonlinear coupling to the optical field at frequency $5ω$ is found to depend critically on the initial relative phase $ϕ$ of the two propagating pulses; the coupling is enhanced when the pulses interfere constructively in the center ($ϕ=0$), while it is nearly suppressed when they are out of phase ($ϕ=π$). The tuning of the initial absolute phase of the different frequency components of synchronously propapagating $ω$-$3ω$ femtosecond pulses can serve as a means to control coherent anti-Stokes Raman scattering (CARS) processes.

physics.optics↗