scholarly journals Intense XUV pulses from a compact HHG setup using a single harmonic

2021 ◽  
Author(s):  
Martin Kretschmar ◽  
Marc JJ Vrakking ◽  
Bernd Schütte
Keyword(s):  
Photoelectron Spectroscopy ◽  
Coherent Control ◽  
Laser Pulse Energy ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Gas Jet ◽  
Virtual Source ◽  
Nanoscale Structures ◽  
Narrow Bandwidth ◽  
Resonant Transitions

Abstract We report on a compact and spectrally intense extreme-ultraviolet (XUV) source, which is based on high-harmonic generation (HHG) driven by 395 nm pulses. In order to minimize the XUV virtual source size and to maximize the XUV flux, HHG is performed several Rayleigh lengths away from the driving laser focal plane in a high-density gas jet. As a result, a high focused XUV intensity of 5 × 1013 W/cm2 is achieved, using a beamline with a length of only two meters and a modest driving laser pulse energy of 3 mJ. The high XUV intensity is demonstrated by performing a nonlinear ionization experiment in argon, using an XUV spectrum that is dominated by a single harmonic at 22 eV. Ion charge states up to Ar3+ are observed, which requires the absorption of at least four XUV photons. The high XUV intensity and the narrow bandwidth are ideally suited for a variety of applications including photoelectron spectroscopy, the coherent control of resonant transitions and the imaging of nanoscale structures.

scholarly journals Coherent control in the extreme ultraviolet and attosecond regime by synchrotron radiation

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Y. Hikosaka ◽  
T. Kaneyasu ◽  
M. Fujimoto ◽  
H. Iwayama ◽  
M. Katoh
Keyword(s):  
Synchrotron Radiation ◽  
Coherent Control ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Light Sources ◽  
Light Pulses ◽  
Research Areas ◽  
Control Research

Abstract Quantum manipulation of populations and pathways in matter by light pulses, so-called coherent control, is currently one of the hottest research areas in optical physics and photochemistry. The forefront of coherent control research is moving rapidly into the regime of extreme ultraviolet wavelength and attosecond temporal resolution. This advance has been enabled by the development of high harmonic generation light sources driven by intense femtosecond laser pulses and by the advent of seeded free electron laser sources. Synchrotron radiation, which is usually illustrated as being of poor temporal coherence, hitherto has not been considered as a tool for coherent control. Here we show an approach based on synchrotron radiation to study coherent control in the extreme ultraviolet and attosecond regime. We demonstrate this capability by achieving wave-packet interferometry on Rydberg wave packets generated in helium atoms.

scholarly journals Binding energy of solvated electrons and retrieval of true UV photoelectron spectra of liquids

2019 ◽  
Vol 5 (8) ◽  
pp. eaaw6896 ◽  
Author(s):  
Junichi Nishitani ◽  
Yo-ichi Yamamoto ◽  
Christopher W. West ◽  
Shutaro Karashima ◽  
Toshinori Suzuki
Keyword(s):  
Binding Energy ◽  
Photoelectron Spectroscopy ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Chemical Species ◽  
Electronic Energy ◽  
Photoelectron Spectra ◽  
Solvated Electrons ◽  
Energy Distributions ◽  
Uv Photoelectron Spectroscopy

The electronic energy and dynamics of solvated electrons, the simplest yet elusive chemical species, is of interest in chemistry, physics, and biology. Here, we present the electron binding energy distributions of solvated electrons in liquid water, methanol, and ethanol accurately measured using extreme ultraviolet (EUV) photoelectron spectroscopy of liquids with a single-order high harmonic. The distributions are Gaussian in all cases. Using the EUV and UV photoelectron spectra of solvated electrons, we succeeded in retrieving sharp electron kinetic energy distributions from the spectra broadened and energy shifted by inelastic scattering in liquids, overcoming an obstacle in ultrafast UV photoelectron spectroscopy of liquids. The method is demonstrated for the benchmark systems of charge transfer to solvent reaction and ultrafast internal conversion of hydrated electron from the first excited state.

scholarly journals Ultrafast extreme ultraviolet photoemission without space charge

2019 ◽  
Vol 205 ◽  
pp. 02014
Author(s):  
Peng Zhao ◽  
Christopher Corder ◽  
Jin Bakalis ◽  
Xinlong Li ◽  
Matthew D. Kershis ◽  
...  
Keyword(s):  
Space Charge ◽  
Photoelectron Spectroscopy ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Photoelectron Spectra ◽  
Time Resolved ◽  
Record Time ◽  
Free Sample ◽  
Harmonic Source

We present photoelectron spectroscopy experiments using an 88 MHz cavityenhanced high-harmonic source operating from 8 to 40 eV. Nanoampere space-charge free sample photo currents enable us to record time-resolved photoelectron spectra from weakly excited samples.

scholarly journals Coherent Diffractive Imaging Using Table-top High Harmonic Generation

2018 ◽  
Vol 28 (2) ◽  
pp. 97
Author(s):  
Khuong Ba Dinh ◽  
Khoa Anh Tran ◽  
Peter Hannaford ◽  
Lap Van Dao
Keyword(s):  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Theoretical Description ◽  
Diffractive Imaging ◽  
Coherent Diffractive Imaging ◽  
Microscopy Technique ◽  
Narrow Bandwidth ◽  
High Resolution Images ◽  
Harmonic Source ◽  
Short Wavelength Light

Coherent diffractive imaging (CDI) is a lensless microscopy technique in which the structure of a specimen of interest is probed using a coherent short-wavelength light source. CDI has been widely used in nanotechnology and structural biology to capture high resolution images of non-crystalline objects. In this paper, we review the theoretical and experimental aspects of coherent diffractive imaging using a focused narrow-bandwidth table-top high harmonic source. The review begins with an outline of generation and characterization of the high harmonic source. Theoretical description of coherent diffractive imaging technique is then summarized. The review concludes with our recent results in imaging using a single harmonic beam selected by employing XUV focusing mirrors. These achievements provide a promising technique for the non-crystallographic structural determination of membrane proteins using a table-top extreme ultraviolet source.

Surface potential of liquid microjet investigated using extreme ultraviolet photoelectron spectroscopy

2020 ◽  
Vol 152 (14) ◽  
pp. 144503
Author(s):  
Junichi Nishitani ◽  
Shutaro Karashima ◽  
Christopher W. West ◽  
Toshinori Suzuki
Keyword(s):  
Surface Potential ◽  
Photoelectron Spectroscopy ◽  
Extreme Ultraviolet ◽  
Ultraviolet Photoelectron Spectroscopy

scholarly journals Table-top extreme ultraviolet second harmonic generation

2021 ◽  
Vol 7 (21) ◽  
pp. eabe2265
Author(s):  
Tobias Helk ◽  
Emma Berger ◽  
Sasawat Jamnuch ◽  
Lars Hoffmann ◽  
Adeline Kabacinski ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
First Principles ◽  
Extreme Ultraviolet ◽  
Second Harmonic ◽  
High Harmonic ◽  
Electronic Structure Calculations ◽  
Free Electron Lasers ◽  
X Ray ◽  
Structure Calculations

The lack of available table-top extreme ultraviolet (XUV) sources with high enough fluxes and coherence properties has limited the availability of nonlinear XUV and x-ray spectroscopies to free-electron lasers (FELs). Here, we demonstrate second harmonic generation (SHG) on a table-top XUV source by observing SHG near the Ti M2,3 edge with a high-harmonic seeded soft x-ray laser. Furthermore, this experiment represents the first SHG experiment in the XUV. First-principles electronic structure calculations suggest the surface specificity and separate the observed signal into its resonant and nonresonant contributions. The realization of XUV-SHG on a table-top source opens up more accessible opportunities for the study of element-specific dynamics in multicomponent systems where surface, interfacial, and bulk-phase asymmetries play a driving role.

scholarly journals Full-field imaging of thermal and acoustic dynamics in an individual nanostructure using tabletop high harmonic beams

2018 ◽  
Vol 4 (10) ◽  
pp. eaau4295 ◽  
Author(s):  
Robert M. Karl ◽  
Giulia F. Mancini ◽  
Joshua L. Knobloch ◽  
Travis D. Frazer ◽  
Jorge N. Hernandez-Charpak ◽  
...  
Keyword(s):  
Functional Imaging ◽  
Extreme Ultraviolet ◽  
Imaging Techniques ◽  
High Harmonic ◽  
Three Dimensional ◽  
Dynamic Imaging ◽  
Significant Advance ◽  
Grand Challenge ◽  
Diffractive Imaging ◽  
Full Field

Imaging charge, spin, and energy flow in materials is a current grand challenge that is relevant to a host of nanoenhanced systems, including thermoelectric, photovoltaic, electronic, and spin devices. Ultrafast coherent x-ray sources enable functional imaging on nanometer length and femtosecond timescales particularly when combined with advances in coherent imaging techniques. Here, we combine ptychographic coherent diffractive imaging with an extreme ultraviolet high harmonic light source to directly visualize the complex thermal and acoustic response of an individual nanoscale antenna after impulsive heating by a femtosecond laser. We directly image the deformations induced in both the nickel tapered nanoantenna and the silicon substrate and see the lowest-order generalized Lamb wave that is partially confined to a uniform nanoantenna. The resolution achieved—sub–100 nm transverse and 0.5-Å axial spatial resolution, combined with ≈10-fs temporal resolution—represents a significant advance in full-field dynamic imaging capabilities. The tapered nanoantenna is sufficiently complex that a full simulation of the dynamic response would require enormous computational power. We therefore use our data to benchmark approximate models and achieve excellent agreement between theory and experiment. In the future, this work will enable three-dimensional functional imaging of opaque materials and nanostructures that are sufficiently complex that their functional properties cannot be predicted.

scholarly journals Electron quantum path control in high harmonic generation via chirp variation of strong laser pulses

2021 ◽  
Author(s):  
Stylianos Petrakis ◽  
Makis Bakarezos ◽  
Michael Tatarakis ◽  
Emmanouil Benis ◽  
Nektarios Papadogiannis
Keyword(s):  
Laser Pulse ◽  
Ultraviolet Light ◽  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Ultrafast Laser ◽  
Temporal Window ◽  
Electron Quantum ◽  
Extreme Ultraviolet Light

Abstract The quantum phases of the electron paths driven by an ultrafast laser in high harmonic generation in an atomic gas depends linearly on the instantaneous cycle-averaged laser intensity. Using high laser intensities, a complete single ionisation of the atomic gas may occur before the laser pulse peak. Therefore, high harmonic generation could be localized only in a temporal window at the leading edge of laser pulse envelope. Varying the laser frequency chirp of an intense ultrafast laser pulse, the centre, and the width of the temporal window, that the high harmonic generation phenomenon occurs, could be controlled with high accuracy. This way, both the duration and the phase of the electron trajectories, that generate efficiently high harmonics, is fully controlled. An accurate and robust method of spectral control and selection of the high harmonic extreme ultraviolet light from distinct quantum paths is experimentally demonstrated. Furthermore, a phenomenological numerical model enlightens the physical processes that take place. This novel approach of the electron quantum path selection via laser chirp is a simple and versatile way of controlling the time-spectral characteristics of the coherent extreme ultraviolet light with future applications in the fields of attosecond pulses and soft x-ray nano-imaging.

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