Imaging the Renner–Teller effect using laser-induced electron diffraction DOI Open Access
Kasra Amini,

Michele Sclafani,

Tobias Steinle

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2019, Volume and Issue: 116(17), P. 8173 - 8177

Published: April 5, 2019

Significance Laser-induced electron diffraction is a molecular-scale microscopy that captures clean snapshots of molecule’s geometry with subatomic picometer and attosecond spatiotemporal resolution. We induce unambiguously identify the stretching bending linear triatomic molecule following excitation to an excited electronic state bent stretched geometry. show we can directly retrieve structure electronically molecules otherwise possible through indirect retrieval methods such as pump–probe rotational spectroscopy measurements.

Language: Английский

Progress on table-top isolated attosecond light sources DOI
Katsumi Midorikawa

Nature Photonics, Journal Year: 2022, Volume and Issue: 16(4), P. 267 - 278

Published: March 7, 2022

Language: Английский

Citations

123
Attosecond spectroscopy for the investigation of ultrafast dynamics in atomic, molecular and solid-state physics DOI
Rocío Borrego‐Varillas, Matteo Lucchini, M. Nisoli

et al.

Reports on Progress in Physics, Journal Year: 2022, Volume and Issue: 85(6), P. 066401 - 066401

Published: March 16, 2022

Since the first demonstration of generation attosecond pulses (1 as = 10-18s) in extreme-ultraviolet spectral region, several measurement techniques have been introduced, at beginning for temporal characterization pulses, and immediately after investigation electronic nuclear ultrafast dynamics atoms, molecules solids with unprecedented resolution. The spectroscopic tools established last two decades, together development sophisticated theoretical methods interpretation experimental outcomes, allowed to unravel investigate physical processes never observed before, such delay photoemission from atoms solids, motion electrons prompt ionization which precede any notable motion, evolution tunneling process dielectrics, many others. This review focused on applications solids. Thanks introduction ongoing developments new techniques, science is rapidly moving towards investigation, understanding control coupled electron-nuclear increasingly complex systems, ever more accurate complete techniques. Here we will most common presenting latest results

Language: Английский

Citations

94
Watt-scale super-octave mid-infrared intrapulse difference frequency generation DOI Creative Commons
Christian Gaida, Martin Gebhardt,

Tobias Heuermann

et al.

Light Science & Applications, Journal Year: 2018, Volume and Issue: 7(1)

Published: Nov. 23, 2018

The development of high-power, broadband sources coherent mid-infrared radiation is currently the subject intense research that driven by a substantial number existing and continuously emerging applications in medical diagnostics, spectroscopy, microscopy, fundamental science. One major, long-standing challenges improving performance these has been construction compact, sources, which unify properties high brightness spatial temporal coherence. Due to lack such several can be addressed only with infrared (IR)-beamlines large-scale synchrotron facilities, are limited regarding user access partially fulfill properties. Here, we present table-top, broadband, light source provides at an unprecedented level supersedes synchrotrons wavelength range between 3.7 18 µm orders magnitude. This result enabled few-cycle Tm-doped fiber laser system, employed as pump 1.9 for intrapulse difference frequency generation (IPDFG). IPDFG intrinsically ensures formation carrier-envelope-phase stable pulses, provide ideal prerequisites state-of-the-art spectroscopy microscopy.

Language: Английский

Citations

144
Deep-UV to Mid-IR Supercontinuum Generation driven by Mid-IR Ultrashort Pulses in a Gas-filled Hollow-core Fiber DOI Creative Commons
Abubakar I. Adamu, Md. Selim Habib, Christian Petersen

et al.

Scientific Reports, Journal Year: 2019, Volume and Issue: 9(1)

Published: March 14, 2019

Supercontinuum (SC) generation based on ultrashort pulse compression constitutes one of the most promising technologies towards an ultra-wide bandwidth, high-brightness and spatially coherent light sources for applications such as spectroscopy microscopy. Here, multi-octave SC in a gas-filled hollow-core antiresonant fiber (HC-ARF) is reported spanning from 200 nm deep ultraviolet (DUV) to 4000 mid-infrared (mid-IR). A measured average output power 5 mW was obtained by pumping at center wavelength first anti-resonance transmission window (2460 nm) with ~100 fs pulses injected energy ~7-8 {\mu}J. The mechanism behind extreme spectral broadening relies upon intense soliton-plasma nonlinear dynamics which leads efficient soliton self-compression phase-matched dispersive wave (DW) emission DUV region. strongest DW observed 275 having estimated 1.42 {\mu}J, corresponding 28.4 % total energy. Furthermore, effect changing pump gas pressure their direct impact investigated. current work paves new way novel investigations gas-based ultrafast optics emerging mid-IR regime.

Language: Английский

Citations

113
High-energy few-cycle pulses: post-compression techniques DOI Creative Commons
Tamás Nagy,

Péter Simon,

L. Veisz

et al.

Advances in Physics X, Journal Year: 2020, Volume and Issue: 6(1)

Published: Nov. 30, 2020

Contemporary ultrafast science requires reliable sources of high-energy few-cycle light pulses. Currently two methods are capable generating such pulses: post compression short laser pulses and optical parametric chirped-pulse amplification (OPCPA). Here we give a comprehensive overview on the post-compression technology based Kerr-effect or ionization, with particular emphasis energy power scaling. Relevant types techniques discussed including free propagation in bulk materials, multiple-plate continuum generation, multi-pass cells, filaments, photonic-crystal fibers, hollow-core fibers self-compression techniques. We provide theoretical physics as well an in-depth description existing experimental realizations compression, especially those that can pulse duration mJ-scale energy. The achieved performances these compared terms important figures merit energy, duration, peak average power. some perspectives at end to emphasize expected future trends this technology.

Language: Английский

Citations

106
Highly stable, 15 W, few-cycle, 65 mrad CEP-noise mid-IR OPCPA for statistical physics DOI Creative Commons
Nicolas Thiré,

Raman Maksimenka,

Bálint Kiss

et al.

Optics Express, Journal Year: 2018, Volume and Issue: 26(21), P. 26907 - 26907

Published: Oct. 1, 2018

We demonstrate a 100 kHz optical parametric chirped-pulse amplifier delivering under 4-cycle (38 fs) pulses at ~3.2 µm with an average power of 15.2 W pulse-topulse energy stability <0.7% rms and single-shot CEP noise 65 mrad RMS over 8h.This source is continuously monitored, by using fast data acquisition device, presents extreme stability, in the short long terms.

Language: Английский

Citations

100
A six-octave optical frequency comb from a scalable few-cycle erbium fibre laser DOI
Daniel Lesko,

Henry Timmers,

Sida Xing

et al.

Nature Photonics, Journal Year: 2021, Volume and Issue: 15(4), P. 281 - 286

Published: March 11, 2021

Language: Английский

Citations

100
Water window soft x-ray source enabled by a 25 W few-cycle 2.2 µm OPCPA at 100 kHz DOI Creative Commons
Justinas Pupeikis, Pierre-Alexis Chevreuil,

N. Bigler

et al.

Optica, Journal Year: 2019, Volume and Issue: 7(2), P. 168 - 168

Published: Dec. 24, 2019

Coherent soft x-ray (SXR) sources enable fundamental studies in the important water window spectral region. Until now, such have been limited to repetition rates of 1 kHz or less, which restricts count and signal-to-noise ratio for a variety experiments. SXR generation at high rate has remained challenging because missing high-power infrared laser drive high-harmonic (HHG) process. Here we present an optical parametric chirped pulse amplifier (OPCPA) centered wavelength 2.2 µm generating 16.5 fs pulses (2.2 oscillation cycles carrier wave) with 25 W average power peak exceeding 14 GW 100 rate. This corresponds highest reported high-repetition-rate long-wavelength systems. The output this OPCPA system was used generate coherent radiation extending beyond 0.6 keV through HHG high-pressure gas cell.

Language: Английский

Citations

98
Seven-octave high-brightness and carrier-envelope-phase-stable light source DOI
Ugaitz Elu, Luke Maidment, Lénárd Vámos

et al.

Nature Photonics, Journal Year: 2020, Volume and Issue: 15(4), P. 277 - 280

Published: Dec. 14, 2020

Language: Английский

Citations

88
High-harmonic spectroscopy of quantum phase transitions in a high-Tc superconductor DOI Creative Commons
Jordi Alcalà, Utso Bhattacharya, Jens Biegert

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2022, Volume and Issue: 119(40)

Published: Sept. 26, 2022

We report on the nonlinear optical signatures of quantum phase transitions in high-temperature superconductor YBCO, observed through high harmonic generation. While linear response material is largely unchanged when cooling across transitions, sensitively imprints two critical points, one at temperature cuprate with exponential growth surface yield superconducting and another point, which marks transition from strange metal to pseudogap phase. To reveal underlying microscopic dynamics, a strong-field quasi-Hubbard model was developed, describes measured dependent formation Cooper pairs. Further, theory provides insight into carrier scattering dynamics allows us differentiate between superconducting, pseudogap, phases. The direct connection powerful methodology study correlated materials. Further implications are light wave control over intricate phases, light–matter hybrids, application for computing.

Language: Английский

Citations

44