Strong-laser-field-induced ionization assisted by a terahertz pulse DOI
D. B. Milošević

Optics Letters, Journal Year: 2022, Volume and Issue: 47(7), P. 1669 - 1669

Published: Feb. 22, 2022

Extreme terahertz (THz) pulses can be generated via interaction of strong infrared ultrashort laser with a suitable target. Inverting this scheme, we propose to use such THz control strong-laser-field-driven processes. In particular, show that for THz-pulse-assisted strong-laser-field ionization the electron yield increased by one order magnitude some energies, and maximal emitted photoelectron energy few times higher than realized field alone. This achieved intensity many orders lower ionizing field. The only requirement is vector potential amplitude field, which governs dynamics after comparable used An important parameter time delay between pulse pulse. Strong-field Cs atoms an illustration. numerical results are obtained applying improved strong-field approximation. For physical explanation, quantum-orbit theory supported modified saddle-point method, as well classical model.

Language: Английский

Nonlinear pulse compression to 51-W average power GW-class 35-fs pulses at 2-µm wavelength in a gas-filled multi-pass cell DOI

Philipp Gierschke,

Christian Grebing,

M. Abdelaal

et al.

Optics Letters, Journal Year: 2022, Volume and Issue: 47(14), P. 3511 - 3511

Published: June 17, 2022

We report on the generation of GW-class peak power, 35-fs pulses at 2-µm wavelength with an average power 51 W 300-kHz repetition rate. A compact, krypton-filled Herriott-type cavity employing metallic mirrors is used for spectral broadening. This multi-pass compression stage enables efficient post emitted by ultrafast coherently combined thulium-doped fiber laser system. The presented results demonstrate excellent preservation input beam quality in combination a transmission as high 80%. These show that cell based post-compression attractive alternative to nonlinear broadening fibers, which commonly employed and other mid-infrared systems. Particularly, scalability potential achieve few-cycle pulse durations make this scheme highly attractive.

Language: Английский

Citations

14
X-ray magnetic circular dichroism spectroscopy at the Fe L edges with a picosecond laser-driven plasma source DOI Creative Commons
Martin Borchert, Dieter Engel, Clemens von Korff Schmising

et al.

Optica, Journal Year: 2023, Volume and Issue: 10(4), P. 450 - 450

Published: March 6, 2023

Time-resolved x-ray magnetic circular dichroism (XMCD) enables a unique spectroscopic view on complex spin and charge dynamics in multi-elemental materials. So far, its application the soft-x-ray range has been limited to synchrotron-radiation sources free-electron lasers. By combining laser-driven plasma source with thin-film polarizer, we generate up 30% polarization regime, enabling first XMCD spectroscopy at Fe L edges laser laboratory, our knowledge. Our approach can be readily adapted other transition metal rare earth M absorption edges, temporal resolution of <10ps, wide ultrafast magnetization studies realized.

Language: Английский

Citations

8
8.7-W average power, in-band pumped femtosecond Ho:CALGO laser at 2.1 µm DOI Creative Commons
Weichao Yao, Yicheng Wang, Sergei Tomilov

et al.

Optics Express, Journal Year: 2022, Volume and Issue: 30(23), P. 41075 - 41075

Published: Sept. 13, 2022

We report on an in-band pumped SESAM mode-locked Ho:CALGO bulk laser with a record-high average power of 8.7 W and optical-to-optical efficiency 38.2% at central wavelength 2.1 µm. At this level, the generates pulses duration 369 fs 84.4-MHz repetition rate, corresponding to pulse energy 103 nJ peak 246 kW. To best our knowledge, is highest directly generated from in 2-3 µm region. Our current results indicate that competitive candidate for scaling 2-µm femtosecond lasers.

Language: Английский

Citations

12
49 W carrier-envelope-phase-stable few-cycle 2.1 µm OPCPA at 10 kHz DOI Creative Commons

Maximilian F. Seeger,

Dominik Kammerer,

Johannes Blöchl

et al.

Optics Express, Journal Year: 2023, Volume and Issue: 31(15), P. 24821 - 24821

Published: June 14, 2023

We demonstrate a mid-infrared optical parametric chirped pulse amplifier (OPCPA), delivering 2.1 µm center wavelength pulses with 20 fs duration and 4.9 mJ energy at 10 kHz repetition rate. This self-seeded system is based on kW-class Yb:YAG thin-disk driving CEP stable short-wavelength-infrared (SWIR) generation three consecutive OPCPA stages. Our SWIR source achieves an average power of 49 W, while still maintaining excellent phase stability sub-100 mrad carrier-envelope-phase-noise 0.8% fluctuations. These parameters enable the setup to drive attosecond pump probe spectroscopy experiments photon energies in water window.

Language: Английский

Citations

7
Laboratory soft X-ray setup for transient absorption experiments in the liquid phase using a laser-produced plasma source DOI Creative Commons
Richard Gnewkow, H. Stiel, Adrian Jonas

et al.

Optica, Journal Year: 2024, Volume and Issue: 11(6), P. 744 - 744

Published: April 8, 2024

With time-resolved soft X-ray spectroscopy, the element-specific dynamics of electronic structure disordered systems can be investigated. Measurements species in dilute liquid solutions are particularly challenging and require high photon flux combined with low experimental noise. This mostly limited these experiments to large-scale facilities, especially for energies above water window (533 eV). Based on a laser-produced plasma source, our system enables, best knowledge, first static transient phase performed laboratory up 1400 eV time resolution 500 ps. We benchmark investigations [Ni(CN) 4 ] 2− widely used model complex [Fe(bpy) 3 2+ , both an aqueous solution. The introduced self-referencing concept ensures that measurements noise limited. Our results form basis further liquid-phase investigating diluted solutions.

Language: Английский

Citations

2
Interferometric measurements of nonlinear refractive index in the infrared spectral range DOI Creative Commons
Gaudenis Jansonas, Rimantas Budriūnas, Mikas Vengris

et al.

Optics Express, Journal Year: 2022, Volume and Issue: 30(17), P. 30507 - 30507

Published: July 26, 2022

This study presents the development and application of interferometric technique for measurement nonlinear refractive index optical materials, while directly accounting experimentally determined laser pulse shape beam profile. The method was employed in a systematic on series common materials used near mid-IR spectral range, where experimental data material properties is still scarce. values were at 1.03 µm, 2.2 3.2 µm. results are compared to by previous studies (where available), influence cascaded second-order nonlinearities discussed.

Language: Английский

Citations

11
Element-Specific Magnetization Dynamics of Complex Magnetic Systems Probed by Ultrafast Magneto-Optical Spectroscopy DOI Creative Commons
Clemens von Korff Schmising, Felix Willems, S. Sharma

et al.

Applied Sciences, Journal Year: 2020, Volume and Issue: 10(21), P. 7580 - 7580

Published: Oct. 28, 2020

The vision to manipulate and control magnetism with light is driven on the one hand by fundamental questions of direct indirect photon-spin interactions, other necessity cope ever growing data volumes, requiring radically new approaches how write, read process information. Here, we present two complementary experimental geometries access element-specific magnetization dynamics complex magnetic systems via ultrafast magneto-optical spectroscopy in extreme ultraviolet spectral range. First, employ linearly polarized radiation a free electron laser facility demonstrate decoupled sublattices an FeGd alloy, prerequisite for all-optical switching. Second, use circularly generated laboratory-based high harmonic generation setup show optical inter-site spin transfer CoPt mechanism which only very recently has been predicted mediate metamagnetic phase transitions.

Language: Английский

Citations

14
High-power two-color plasma-based THz generation driven by a Tm-doped fiber laser DOI
Joachim Buldt,

Tobias Heuermann,

Ziyao Wang

et al.

Optics Letters, Journal Year: 2023, Volume and Issue: 48(13), P. 3403 - 3403

Published: May 30, 2023

We report on the efficient generation of broadband THz radiation based a two-color gas-plasma scheme. Broadband pulses covering whole spectral region, from 0.1-35 THz, are generated. This is enabled by high-power, ultra-fast, thulium-doped, fiber chirped pulse amplification (Tm:FCPA) system and subsequent nonlinear compression stage that uses gas-filled capillary. The driving source delivers 40 fs at central wavelength 1.9 μm with 1.2 mJ energy 101 kHz repetition rate. Owing to long use gas-jet in focus, highest reported conversion efficiency for high-power sources (>20 mW) 0.32% has been achieved. high average power 380 mW make this an ideal nonlinear, tabletop science.

Language: Английский

Citations

4
Laser-driven resonant magnetic soft-x-ray scattering for probing ultrafast antiferromagnetic and structural dynamics DOI Creative Commons
Daniel Schick, Martin Borchert, J. Braenzel

et al.

Optica, Journal Year: 2021, Volume and Issue: 8(9), P. 1237 - 1237

Published: Aug. 16, 2021

Time-resolved resonant magnetic scattering in the soft-x-ray range is a powerful tool for accessing spatially resolved and element-specific spin dynamics materials. So far, application of this photon-demanding technique was limited to large-scale facilities. However, upgrades diffraction-limited storage rings supporting only x-ray pulses beyond 100 ps, shift free-electron lasers toward attosecond aggravate competition beamtime picosecond time window, which utmost relevance magnetism research. Here we present development lab-based instrument providing sufficient photon flux up 1.5 keV energy covering resonances transition rare-earth metal atoms. Our setup features mandatory tunability reciprocal space combination with sub-10 ps temporal resolution, exploiting broadband emission laser-driven plasma source, monochromatized about 1 eV bandwidth by reflection zone plate. We benchmark our approach against accelerator-based sources simultaneously probing laser-induced structural from an antiferromagnetically coupled Fe/Cr superlattice. lays foundation experiments study ultrafast ordering phenomena charges, spins, orbitals.

Language: Английский

Citations

10
Above-threshold detachment by strong ultrashort two-component laser pulses DOI
D. Habibović, D. B. Milošević

Physical review. A/Physical review, A, Journal Year: 2023, Volume and Issue: 107(5)

Published: May 15, 2023

Detachment of electrons from negative ions by the ultrashort few-cycle laser pulses in near-infrared spectral region is investigated using a theory based on strong-field approximation. The differential detachment probability computed numerical integration or saddle-point method. symmetry properties photoelectron momentum distribution are analyzed for elliptically polarized as well bi-elliptical driving field with sine-square pulse envelope and compared those obtained long flat envelope. We show that depends, to significant extent, polarization state light. For direct electrons, i.e., which, after detachment, do not interact parent atom, this case if process induced In addition state, also depends value absolute phase. qualitative quantitative characteristics can accurately be controlled parameter control knob. This particularly successful regions where rescattered dominant due fact they stay longer applied field.

Language: Английский

Citations

4