Bruno E. Schmidt
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View article: Gigawatt level, 10 fs high efficiency visible pulse generation
Gigawatt level, 10 fs high efficiency visible pulse generation Open
We present a robust approach capable of generating ultrashort pulses in the visible (VIS) spectral range through second-harmonic generation of broadened pulses centered at around 1030 nm. Tunable VIS pulses with durations as short as 10 fs…
View article: Crossover operators for molecular graphs with an application to virtual drug screening
Crossover operators for molecular graphs with an application to virtual drug screening Open
Genetic algorithms are a powerful method to solve optimization problems with complex cost functions over vast search spaces that rely in particular on recombining parts of previous solutions. Crossover operators play a crucial role in this…
View article: High-power femtosecond molecular broadening and the effects of ro-vibrational coupling
High-power femtosecond molecular broadening and the effects of ro-vibrational coupling Open
Scaling spectral broadening to higher pulse energies and average powers is a critical step in ultrafast science, especially for narrowband Yb-based solid state lasers, which have become the new state-of-the-art. Despite their high nonlinea…
View article: Crossover Operators for Molecular Graphs with an Application to Virtual Drug Screening
Crossover Operators for Molecular Graphs with an Application to Virtual Drug Screening Open
Genetic Algorithms are a powerful method to solve optimization problems with complex cost functions over vast search spaces that rely in particular on recombining parts of previous solutions. Crossover operators play a crucial role in this…
View article: Partial Fitch Graphs: Characterization, Satisfiability and Complexity∗
Partial Fitch Graphs: Characterization, Satisfiability and Complexity∗ Open
Horizontal gene transfer is an important contributor to evolution. Following Walter M. Fitch, two genes are xenologs if at least one HGT separates them. More formally, the directed Fitch graph has a set of genes as its vertices, and direct…
View article: High-power femtosecond molecular broadening and the effects of ro-vibrational coupling
High-power femtosecond molecular broadening and the effects of ro-vibrational coupling Open
Scaling spectral broadening to higher pulse energies and average powers, respectively, is a critical step in ultrafast science, especially for narrowband Yb-based solid state lasers which become the new state-of-the-art. Despite their high…
View article: High-power femtosecond molecular broadening and the effects of ro-vibrational coupling
High-power femtosecond molecular broadening and the effects of ro-vibrational coupling Open
Scaling spectral broadening to higher pulse energies and average powers, respectively, is a critical step in ultrafast science, especially for narrowband Yb-based solid state lasers which become the new state-of-the-art. Despite their high…
View article: High-power femtosecond molecular broadening and the effects of ro-vibrational coupling
High-power femtosecond molecular broadening and the effects of ro-vibrational coupling Open
Scaling spectral broadening to higher pulse energies and average powers, respectively, is a critical step in ultrafast science, especially for narrowband Yb based solid state lasers which become the new state of the art. Despite their high…
View article: Imaging Ultrafast Dissociation Dynamics: OCS & Roaming in Formaldehyde
Imaging Ultrafast Dissociation Dynamics: OCS & Roaming in Formaldehyde Open
Upon photoexcitation, molecules break apart, following different dissociation reactions. We can image these dissociation pathways using Coulomb explosion imaging (CEI) and sometimes we can control them using asymmetric laser fields. In the…
View article: High average power ultrafast laser technologies for driving future advanced accelerators
High average power ultrafast laser technologies for driving future advanced accelerators Open
Large scale laser facilities are needed to advance the energy frontier in high energy physics and accelerator physics. Laser plasma accelerators are core to advanced accelerator concepts aimed at reaching TeV electron electron colliders. I…
View article: HHG at the Carbon K-Edge Directly Driven by SRS Red-Shifted Pulses from an Ytterbium Amplifier
HHG at the Carbon K-Edge Directly Driven by SRS Red-Shifted Pulses from an Ytterbium Amplifier Open
In this work, we introduce a simplified approach to efficiently extend the high harmonic generation (HHG) cutoff in gases without the need for laser frequency conversion via parametric processes. Instead, we employ postcompression and red-…
View article: High average power ultrafast laser technologies for driving future advanced accelerators
High average power ultrafast laser technologies for driving future advanced accelerators Open
Large scale laser facilities are needed to advance the energy frontier in high energy physics and accelerator physics. Laser plasma accelerators are core to advanced accelerator concepts aimed at reaching TeV electron electron colliders. I…
View article: Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source
Ultrafast magnetic scattering on ferrimagnets enabled by a bright Yb-based soft x-ray source Open
Development of ultrafast table-top x-ray sources that can map various spin, orbital, and electronic configurations and reordering processes on their natural time and length scales is an essential topic for modern condensed matter physics a…
View article: Evolution of longitudinal plasma-density profiles in discharge capillaries for plasma wakefield accelerators
Evolution of longitudinal plasma-density profiles in discharge capillaries for plasma wakefield accelerators Open
Precise characterization and tailoring of the spatial and temporal evolution of plasma density within plasma sources is critical for realizing high-quality accelerated beams in plasma wakefield accelerators. The simultaneous use of two ind…
View article: Extreme Raman red shift: ultrafast multimode nonlinear space-time dynamics, pulse compression, and broadly tunable frequency conversion
Extreme Raman red shift: ultrafast multimode nonlinear space-time dynamics, pulse compression, and broadly tunable frequency conversion Open
Ultrashort high-energy pulses at wavelengths longer than 1 µm are now desirable for a vast variety of applications in ultrafast and strong-field physics. To date, the main answer to the wavelength tunability for energetic, broadband pulses…
View article: Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion
Extreme Raman red shift: ultrafast multimode non-linear space-time dynamics, pulse compression, and broadly tunable frequency conversion Open
Ultrashort high-energy pulses at wavelengths longer than 1 $μ$m are nowadays desired for a vast variety of applications in ultrafast and strong-field physics. To date, the main answer to the wavelength tunability for energetic, broadband p…
View article: High-field mid-infrared pulses derived from frequency domain optical parametric amplification
High-field mid-infrared pulses derived from frequency domain optical parametric amplification Open
We present a novel, to the best of our knowledge, approach for scaling the peak power of mid-infrared laser pulses with few-cycle duration and carrier-to-envelope phase stabilization. Using frequency domain optical parametric amplification…
View article: Raman effect in the spectral broadening of ultrashort laser pulses in saturated versus unsaturated hydrocarbon molecules
Raman effect in the spectral broadening of ultrashort laser pulses in saturated versus unsaturated hydrocarbon molecules Open
A conventional hollow core fiber (HCF) scheme is implemented to investigate spectral broadening of Titanium:Sapphire (Ti-Sa) femtosecond laser pulses in saturated hydrocarbon molecules compared to unsaturated ones. While the saturated mole…
View article: Temporal characterization of femtosecond laser pulses using tunneling ionization in the UV, visible, and mid-IR ranges
Temporal characterization of femtosecond laser pulses using tunneling ionization in the UV, visible, and mid-IR ranges Open
To generalize the applicability of the temporal characterization technique called “tunneling ionization with a perturbation for the time-domain observation of an electric field” (TIPTOE), the technique is examined in the multicycle regime …
View article: Time-resolving magnetic scattering on rare-earth ferrimagnets with a bright soft-X-ray high-harmonic source
Time-resolving magnetic scattering on rare-earth ferrimagnets with a bright soft-X-ray high-harmonic source Open
We demonstrate the first time-resolved X-ray resonant magnetic scattering (tr-XRMS) experiment at the N edge of Tb at 155 eV performed using a tabletop high-brightness high-harmonic generation (HHG) source. In contrast to static X-ray imag…
View article: Extremely broadband terahertz generation via pulse compression of an Ytterbium laser amplifier
Extremely broadband terahertz generation via pulse compression of an Ytterbium laser amplifier Open
We present a system for extremely broadband terahertz (THz) generation based on an Ytterbium (Yb) amplified laser emitting 170-fs-long pulses centered at 1030 nm. The pulses are first spectrally broadened in an Ar-filled hollow-core capill…
View article: Phase-matching-free pulse retrieval based on transient absorption in solids
Phase-matching-free pulse retrieval based on transient absorption in solids Open
In this paper, we introduce a pulse characterization technique that is free of phase-matching constraints, exploiting transient absorption in solids as an ultrafast optical switch. Based on a pump-probe setup, this technique uses pump puls…
View article: Terahertz control of air lasing
Terahertz control of air lasing Open
The coherent emission from ionized nitrogen molecules is of interest for remote sensing and astronomical applications. To initiate the lasing process, we used an intense ultrashort near-infrared (NIR) pulse overlapped with a terahertz (THz…
View article: Low energy pulse compression in hollow core fibers using hydrofluorocarbon molecular gas
Low energy pulse compression in hollow core fibers using hydrofluorocarbon molecular gas Open
Compression of low energy ultrashort laser pulses using a hollow core fiber (HCF) filled with 1-1 difluoroethane (C2H4F2), also known as R152a, is demonstrated. A 45 fs, 16 µJ Ti:Sapphire laser pulse is spectrally broadened in an HCF fille…
View article: Directional control of dissociative ionization by a two-colour laser field
Directional control of dissociative ionization by a two-colour laser field Open
Using asymmetric two-color laser fields composed of 1800 and 900nm, we have simultaneously controlled four well identified fragmentation channels in dissociative ionization of the hydrogen molecule, resulting in enhanced electron-localizat…
View article: Molecular gases for pulse compression in hollow core fibers
Molecular gases for pulse compression in hollow core fibers Open
We introduce hydrofluorocarbon molecules as an alternative medium to noble gases with low ionization potential like krypton or xenon to compress ultrashort pulses of relatively low energy in a conventional hollow core fiber with subsequent…
View article: Direct compression of 170-fs 50-cycle pulses down to 1.5 cycles with 70% transmission
Direct compression of 170-fs 50-cycle pulses down to 1.5 cycles with 70% transmission Open
We present a straightforward route for extreme pulse compression, which relies on moderately driving self-phase modulation (SPM) over an extended propagation distance. This avoids that other detrimental nonlinear mechanisms take over and d…