Collinear Generation of Ultrashort UV and XUV Pulses for Pump/probe Spectroscopy

2009 ◽  
Vol 1230 ◽  
Author(s):  
Elisabeth Bothschafter ◽  
Agustin Schiffrin ◽  
Ferenc Krausz ◽  
Ralph Ernstorfer ◽  
Reinhard Kienberger
Keyword(s):  
Photon Energy ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
Noble Gas ◽  
High Harmonic ◽  
Coherent Light ◽  
Pump Probe ◽  
Third Harmonic ◽  
Gas Targets ◽  
Probe Spectroscopy

AbstractThe collinear generation of sub-4 fs ultraviolet (UV) and attosecond extreme ultraviolet (XUV) pulses via subsequent third-harmonic and high harmonic generation in noble gases is demonstrated. The ultrashort coherent light bursts are produced by focusing a sub-1.5 cycle near-infrared/visible (NIR) laser pulse in two subsequent quasi-static noble gas targets. With this simple approach, inherently synchronized UV pulsed radiation with a photon energy of ˜5 eV and a pulse energy of ˜1 μJ, and XUV pulses with a cut-off photon energy of more than 120 eV and up to ˜107 XUV photons can be generated. This source represents a novel tool for future UV pump/XUV probe experiments with unprecedented time-resolution.

scholarly journals Generation and characterisation of isolated attosecond pulses at 100 kHz repetition rate

2021 ◽  
Author(s):  
Tobias Witting ◽  
Mikhail Osolodkov ◽  
Felix Schell ◽  
Felipe Morales ◽  
Serguei Patchkovskii ◽  
...  
Keyword(s):  
Surface Science ◽  
Repetition Rate ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Attosecond Pulse ◽  
Light Sources ◽  
Pump Probe ◽  
Attosecond Pulses ◽  
Atomic And Molecular Physics ◽  
Pump Probe Experiment

Abstract The generation of coherent light pulses in the extreme ultraviolet (XUV) spectral region with attosecond pulse durations constitutes the foundation of the field of attosecond science [1]. Twenty years after the first demonstration of isolated attosecond pulses [2], they continue to be a unique tool enabling the observation and control of electron dynamics in atoms, molecules and solids [3, 4]. It has long been identified that an increase in the repetition rate of attosecond light sources is necessary for many applications in atomic and molecular physics [5, 6], surface science [7], and imaging [8]. Although high harmonic generation (HHG) at repetition rates exceeding 100 kHz, showing a continuum in the cut-off region of the XUV spectrum was already demonstrated in 2013 [9], the number of photons per pulse was insufficient to perform pulse characterisation via attosecond streaking [10], let alone to perform a pump-probe experiment. Here we report on the generation and full characterisation of XUV attosecond pulses via HHG driven by near-single-cycle pulses at a repetition rate of 100 kHz. The high number of 106 XUV photons per pulse on target enables attosecond electron streaking experiments through which the XUV pulses are determined to consist of a dominant single attosecond pulse. These results open the door for attosecond pump-probe spectroscopy studies at a repetition rate one or two orders of magnitude above current implementations.

scholarly journals Near infrared ultrafast pump-probe spectroscopy with ZrF4-BaF2-LaF3-AlF3-NaF fiber supercontinuum

2015 ◽  
Vol 107 (2) ◽  
pp. 021103 ◽  
Author(s):  
Stefan Fischbach ◽  
Andrey V. Gorbach ◽  
Daniele Di Nuzzo ◽  
Enrico Da Como
Keyword(s):  
Near Infrared ◽  
Pump Probe ◽  
Probe Spectroscopy

scholarly journals Reaction microscope endstation at FLASH2

2019 ◽  
Vol 26 (3) ◽  
pp. 854-867 ◽  
Author(s):  
Georg Schmid ◽  
Kirsten Schnorr ◽  
Sven Augustin ◽  
Severin Meister ◽  
Hannes Lindenblatt ◽  
...  
Keyword(s):  
Gas Phase ◽  
Extreme Ultraviolet ◽  
Time Resolved ◽  
Pump Probe ◽  
Natural Time ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Probe Spectroscopy ◽  
Small Clusters ◽  
Reaction Microscope

A reaction microscope dedicated to multi-particle coincidence spectroscopy on gas-phase samples is installed at beamline FL26 of the free-electron laser FLASH2 in Hamburg. The main goals of the instrument are to follow the dynamics of atoms, molecules and small clusters on their natural time-scale and to study non-linear light–matter interaction with such systems. To this end, the reaction microscope is combined with an in-line extreme-ultraviolet (XUV) split-delay and focusing optics, which allows time-resolved XUV-XUV pump–probe spectroscopy to be performed.

scholarly journals Limitations of Extreme Nonlinear Ultrafast Nanophotonics

Nanophotonics ◽  
2015 ◽  
Vol 4 (3) ◽  
pp. 303-323 ◽  
Author(s):  
Christian Kern ◽  
Michael Zürch ◽  
Christian Spielmann
Keyword(s):  
Extreme Ultraviolet ◽  
Noble Gas ◽  
High Harmonic ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Optical Antennas ◽  
Limiting Factor ◽  
Temporal Properties ◽  
Laser Induced Damage ◽  
Nano Antennas

Abstract High-harmonic generation (HHG) has been established as an indispensable tool in optical spectroscopy. This effect arises for instance upon illumination of a noble gas with sub-picosecond laser pulses at focussed intensities significantly greater than 1012W/cm2. HHG provides a coherent light source in the extreme ultraviolet (XUV) spectral region, which is of importance in inner shell photo ionization of many atoms and molecules. Additionally, it intrinsically features light fields with unique temporal properties. Even in its simplest realization, XUV bursts of sub-femtosecond pulse lengths are released. More sophisticated schemes open the path to attosecond physics by offering single pulses of less than 100 attoseconds duration. Resonant optical antennas are important tools for coupling and enhancing electromagnetic fields on scales below their free-space wavelength. In a special application, placing field-enhancing plasmonic nano antennas at the interaction site of an HHG experiment has been claimed to boost local laser field strengths, from insufficient initial intensities to sufficient values. This was achieved with the use of arrays of bow-tie-shaped antennas of ∼ 100nm in length. However, the feasibility of this concept depends on the vulnerability of these nano-antennas to the still intense driving laser light.We show, by looking at a set of exemplary metallic structures, that the threshold fluence Fth of laser-induced damage (LID) is a greatly limiting factor for the proposed and tested schemes along these lines.We present our findings in the context of work done by other groups, giving an assessment of the feasibility and effectiveness of the proposed scheme.

scholarly journals High harmonic generation in mixed XUV and NIR fields at a free-electron laser

2021 ◽  
Author(s):  
Jan Troß ◽  
Shashank Pathak ◽  
Adam Summers ◽  
Dimitrios Rompotis ◽  
Benjamin Erk ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Order ◽  
Phase Matching ◽  
Model Calculations ◽  
High Order Harmonic

Abstract We present the results of an experiment investigating the generation of high-order harmonics by a femtosecond near-infrared (NIR) laser pulse in the presence of an extreme ultraviolet (XUV) field provided by a free-electron laser, a process referred to as XUV-assisted high-order harmonic generation (HHG). Our experimental findings show that the XUV field can lead to a small enhancement in the harmonic yield when the XUV and NIR pulses overlap in time, while a strong decrease of the HHG yield and a red shift of the HHG spectrum is observed when the XUV precedes the NIR pulse. The latter observations are in qualitative agreement with model calculations that consider the effect of a decreased number of neutral emitters but are at odds with the predicted effect of the correspondingly increased ionization fraction on the phase matching. Our study demonstrates the technical feasibility of XUV-assisted HHG experiments at free-electron lasers, which may provide new avenues to investigate correlation-driven electron dynamics as well as novel ways to study and control propagation effects and phase matching in HHG.

Femtosecond excited-state dynamics in chlorosomal carotenoids of the photosynthetic bacterium Chloroflexus aurantiacus revealed by near infrared pump-probe spectroscopy

2021 ◽  
Author(s):  
Andrei Yakovlev ◽  
Alexandra Taisova ◽  
Zoya Fetisova
Keyword(s):  
Excited State ◽  
Near Infrared ◽  
High Efficiency ◽  
Light Harvesting ◽  
Photosynthetic Bacterium ◽  
Chloroflexus Aurantiacus ◽  
Green Bacteria ◽  
Pump Probe ◽  
Excited State Dynamics ◽  
Probe Spectroscopy

In photosynthetic green bacteria, chlorosomes provide light harvesting with high efficiency. Chlorosomal carotenoids (Cars) participate in light harvesting together with the main pigment, bacteriochlorophyll (BChl) c/d/e. In the present work,...

scholarly journals Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2

2020 ◽  
Vol 10 (8) ◽  
pp. 2953 ◽  
Author(s):  
Severin Meister ◽  
Hannes Lindenblatt ◽  
Florian Trost ◽  
Kirsten Schnorr ◽  
Sven Augustin ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
Single Pulse ◽  
Pump Probe ◽  
Electrons And Ions ◽  
Fragmentation Reactions ◽  
Small Clusters ◽  
Reaction Microscope

The reaction microscope (REMI) endstation for atomic and molecular science at the free-electron laser FLASH2 at DESY in Hamburg is presented together with a brief overview of results recently obtained. The REMI allows coincident detection of electrons and ions that emerge from atomic or molecular fragmentation reactions in the focus of the extreme-ultraviolet (XUV) free-electron laser (FEL) beam. A large variety of target species ranging from atoms and molecules to small clusters can be injected with a supersonic gas-jet into the FEL focus. Their ionization and fragmentation dynamics can be studied either under single pulse conditions, or for double pulses as a function of their time delay by means of FEL-pump–FEL-probe schemes and also in combination with a femtosecond infrared (IR) laser. In a recent upgrade, the endstation was further extended by a light source based on high harmonic generation (HHG), which is now available for upcoming FEL/HHG pump–probe experiments.

scholarly journals Simultaneous generation of sub-5-femtosecond 400  nm and 800  nm pulses for attosecond extreme ultraviolet pump–probe spectroscopy

2016 ◽  
Vol 41 (22) ◽  
pp. 5365 ◽  
Author(s):  
Hung-Tzu Chang ◽  
Michael Zürch ◽  
Peter M. Kraus ◽  
Lauren J. Borja ◽  
Daniel M. Neumark ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Simultaneous Generation ◽  
Pump Probe ◽  
Probe Spectroscopy

scholarly journals Ultrafast Electron/Energy Transfer and Intersystem Crossing Mechanisms in BODIPY-Porphyrin Compounds

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 312
Author(s):  
Yusuf Tutel ◽  
Gökhan Sevinç ◽  
Betül Küçüköz ◽  
Elif Akhuseyin Yildiz ◽  
Ahmet Karatay ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Energy Transfer Mechanism ◽  
Free Base ◽  
Pump Probe ◽  
Harvesting Efficiency ◽  
Probe Spectroscopy ◽  
Absorption Features ◽  
Transfer Mechanisms

Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.

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