A5057184832- Laser-Matter Interactions and Applications
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
- Atomic and Molecular Physics
- Terahertz technology and applications
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Advanced Fluorescence Microscopy Techniques
- Ion-surface interactions and analysis
- Spectroscopy and Laser Applications
- Orbital Angular Momentum in Optics
- Photoreceptor and optogenetics research
- Surface and Thin Film Phenomena
- Photonic and Optical Devices
- Force Microscopy Techniques and Applications
- Advanced Optical Sensing Technologies
- Photosynthetic Processes and Mechanisms
- Semiconductor Quantum Structures and Devices
- Quantum Information and Cryptography
- Copper-based nanomaterials and applications
- Atomic and Subatomic Physics Research
- Random lasers and scattering media
Max Planck Institute of Quantum Optics
2015-2024
Ludwig-Maximilians-Universität München
2017-2024
Max Planck Society
2012-2021
Joint Attosecond Science Laboratory
2020
University of Ottawa
2020
Griffith University
2018
Quantum (Australia)
2018
American University of Sharjah
2018
National Research Council Canada
2018
Max Planck Institute for Nuclear Physics
2018
Despite their broad implications for phenomena such as molecular bonding or chemical reactions, our knowledge of multi-electron dynamics is limited and theoretical modelling remains a most difficult task. From the experimental side, it highly desirable to study dynamical evolution interaction electrons over relevant timescales, which extend into attosecond regime. Here we use near-single-cycle laser pulses with well-defined electric field confine double ionization argon atoms single cycle....
The observation and manipulation of electron dynamics in matter call for attosecond light pulses, routinely available from high-order harmonic generation driven by few-femtosecond lasers. However, the energy limitation these lasers supports only weak sources correspondingly linear studies. Here we report on an optical parametric synthesizer designed nonlinear optics relativistic laser-plasma physics. This uniquely combines ultra-relativistic focused intensities about 1020 W/cm2 with a pulse...
The steering of electron motion in molecules is accessible with waveform-controlled few-cycle laser light and may control the outcome light-induced chemical reactions. An optical cycle light, however, much shorter than duration fastest dissociation reactions, severely limiting degree that can be achieved. To overcome this limitation, we extended metrology to midinfrared studying prototypical dissociative ionization ${\mathrm{D}}_{2}$ at $2.1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$....
The strong-field induced decay of a doubly excited, transient Coulomb complex ${\mathrm{Ar}}^{**}\ensuremath{\rightarrow}{\mathrm{Ar}}^{2+}+2{e}^{\ensuremath{-}}$ is explored by tracing correlated two-electron emission in nonsequential double ionization Ar as function the carrier-envelope phase. Using $<6\text{ }\text{ }\mathrm{fs}$ pulses, electron essentially confined to one optical cycle. Classical model calculations support that intermediate has lost memory its formation dynamics and...
Proton migration is a ubiquitous process in chemical reactions related to biology, combustion, and catalysis. Thus, the ability control movement of nuclei with tailored light, within hydrocarbon molecule holds promise for far-reaching applications. Here, we demonstrate steering hydrogen simple hydrocarbons, namely acetylene allene, using waveform-controlled, few-cycle laser pulses. The rearrangement dynamics are monitored coincident 3D momentum imaging spectroscopy, described...
Single-shot carrier-envelope-phase (CEP) tagging is combined with a reaction mircoscope (REMI) to investigate CEP-dependent processes in atoms. Excellent experimental stability and data acquisition longevity are achieved. Using this approach, we study the CEP effects for nonsequential double ionization of argon 4-fs laser fields at 750 nm an intensity $1.6\ifmmode\times\else\texttimes\fi{}{10}^{14}$ W/cm${}^{2}$. The Ar${}^{2+}$ yield shows pronounced dependence which compares well recent...
We investigate the photodetachment process in negative fluorine ion a strong linearly polarized laser field. Angle-resolved momentum distributions of photoelectrons are measured with use an imaging technique for wide range frequencies and peak intensities. The nonmonotonic structure recorded photoelectron spectra is interpreted terms quantum interference effect predicted by Keldysh-like theory. In particular, dependence term on parameters used to explain origin observed spectral features....
We present experimental and theoretical results on photodetachment of Br(-) F(-) in a strong infrared laser field. The observed photoelectron spectra exhibit high-energy plateau along the polarization direction, which is identified as being due to rescattering effect. shape extension found be influenced by depletion negative ions during interaction with pulse. Our findings represent first observation electron above-threshold an atomic system short-range potential.
The interaction of ultra-intense laser pulses with matter opened the way to generate shortest light available nowadays in attosecond regime. Ionized solid surfaces, also called plasma mirrors, are promising tools enhance potential sources terms photon energy, number and duration especially at relativistic intensities. Although production isolated understanding underlying interactions represent a fundamental step towards realization such sources, these challenging have not yet been...
Nonlinear light-matter interactions in the extreme ultraviolet (XUV) are a prerequisite to perform XUV-pump/XUVprobe spectroscopy of core electrons.Such now routinely investigated at free-electron laser (FEL) facilities.Yet, electron dynamics often too fast be captured with femtosecond resolution state-of-theart FELs.Attosecond pulses from laser-driven XUV-sources offer necessary temporal resolution.However, intense attosecond supporting nonlinear processes have only been available for...
We demonstrate a novel method to measure the temporal electric field evolution of ultrashort laser pulses. Our technique is based on detection transient currents in air plasma. These directional result from subcycle ionization with short pump pulse and steering released electrons be sampled. assess validity our approach by comparing it different state-of-the-art laser-pulse characterization techniques. Notably, works ambient facilitates direct measurement waveform, which can viewed real time...
Measuring the field of visible light with high spatial resolution has been challenging, as many established methods only detect a focus-averaged signal. Here, we introduce near-field method for optical sampling that overcomes limitation by employing localization enhanced nanometric needle tip. A probe perturbs photoemission from tip, which is induced pump pulse, generating field-dependent current modulation can easily be captured our electronic detection scheme. The approach provides...
Future PHz electronic devices may be able to perform operations on few-femtosecond time-scales. Such are based the ability control currents induced by intense few-cycle laser pulses. Investigations of this scheme have been complex, amplified systems, typically delivering mJ or sub-mJ-level pulses, limiting achievable clock rate kHz regime. Here, we demonstrate transient metallization and lightwave-driven current with 300-pJ pulses at 80 MHz repetition in dielectric media (HfO 2 fused...
Negative fluorine ions are exposed to a circularly polarized infrared laser pulse with peak intensity on the order of 2.6 x 10(13) W/cm(2). A fundamental difference, as compared case linearly field, is found in absence any structure photoelectron spectrum that can be associated quantum interference effect. This observation accord our recent predictions [S. Beiser, Phys. Rev. 70, 011402 (2004)10.1103/Phys. A.70. 011402]. The experiment reveals length gauge appropriate for description field...
We have tracked nuclear wave-packet dynamics in doubly charged states of molecular oxygen using few-cycle infrared laser pulses. Bound and dissociating wave packets were launched subsequently probed via a pair 8-fs pulses 790 nm radiation. Ionic fragments from the molecules monitored by velocity-map imaging. Pronounced oscillations delay-dependent kinetic energy release spectra observed. The occurrence vibrational revivals permits us to identify potential curves ${\mathrm{O}}_{2}$ dication...
Strong few-cycle light fields with stable electric field waveforms allow controlling electrons on time scales down to the attosecond domain. We have studied dissociative ionization of randomly oriented DCl in 5 fs at 720 nm tunneling regime. Momentum distributions D+ and Cl+ fragments were recorded via velocity-map imaging. A waveform-dependent anti-correlated directional emission is observed. Comparison our results calculations indicates that tailoring carrier envelope phase permits control...
The dissociative ionization of N2O by near-single-cycle laser pulses is studied using phase-tagged ion–ion coincidence momentum imaging. Carrier–envelope phase (CEP) dependences are observed in the absolute ion yields and emission direction nearly all dissociation pathways triatomic molecule. We find that laser-field-driven electron recollision has a significant impact on dynamics results pronounced CEP modulations dication yields, which product after dissociation. indicate directional...
The transition from the near-single to multi-cycle regime in non-sequential double ionization of argon is investigated experimentally. Argon atoms are exposed intense laser pulses with a center wavelength around 790 nm and momenta electrons ions generated process measured coincidence using reaction microscope. duration near transform-limited varied 4 30 fs. We observe an abrupt collapse cross-shaped two-electron momentum distribution [17] few-cycle regime. longer further accompanied by...
Selected features of nonsequential double ionization have been qualitatively reproduced by a multitude different (quantum and classical) approaches. In general, however, the typical uncertainty laser pulse parameters restricted number observables measured in individual experiments leave room for adjusting theoretical results to match experimental data. While this has hampering assessment approaches leading conflicting interpretations, comprehensive data that would allow such an ultimate...
Abstract We demonstrate a tool for quantitative measurements in the extreme ultraviolet (EUV) spectral region measuring spatially resolved atomic ionization products at focus of an EUV beam. The ionizing radiation is comb 11 th –15 harmonics Ti:Sapphire femtosecond laser beam produced Xenon gas jet. spatial ion distribution recorded using microscope. Spatially single- and two-photon Argon Helium are observed. From such distributions generalized cross sections can be extracted by...
The migration of hydrogen atoms resulting in the isomerization hydrocarbons is an important process which can occur on ultrafast timescales. Here, we visualize light-induced acetylene to vinylidene ionic state using two synchronized 4 fs intense laser pulses. first pulse induces migration, and second used for monitoring transient structural changes <italic>via</italic> Coulomb explosion imaging. Varying time delay between pulses reveals dynamics with a constant 54 ± as observed H<sup>+</sup>...
We introduce a novel technique for measuring spatially resolved photoionization yields of gas-phase ions created in an intense-laser focus. Overcoming the limitations traditional experiments where ionization yield is integrated over entire focal volume, provides precise information on dynamics wide range intensities between appearance intensity lowest charge state up to relativistic intensities. The new method insights into process beyond saturation and, at same time, way noninvasive, situ...
We present a comparative study of nonsequential double ionization (NSDI) N${}_{2}$ and Ar exposed to near-single-cycle laser pulses. The NSDI process is investigated using carrier-envelope-phase-tagged electron-ion coincidence spectroscopy. measured spectra exhibit striking resemblance. In particular, the correlated two-electron momentum distribution arising from also displays cross-shape very similar that reported for [Bergues et al., Nat. Commun. 3, 813 (2012)]. interpret our results in...