scholarly journals High harmonic generation and ionization effects in cluster targets

2014 ◽  
Vol 2 ◽  
Author(s):  
M. Aladi ◽  
I. Márton ◽  
P. Rácz ◽  
P. Dombi ◽  
I.B. Földes
Keyword(s):  
Harmonic Generation ◽  
Laser Intensity ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Spectral Shift ◽  
Focal Volume ◽  
Free Electrons ◽  
Harmonic Intensity ◽  
Backing Pressure ◽  
Different Gases

Abstract High harmonic generation in gas jets was investigated in different gases up to more than 14 bar backing pressure. The observation of increase of harmonic intensity with increasing pressure and laser intensity shows evidence of the presence of clusters in Xe with an increased efficiency compared with He, whereas Ar is an intermediate case for which clusters will start to dominate above a certain backing pressure. Spectral investigations give evidence for tunable harmonic generation in a broad spectral range. A spectral shift of opposite signature caused by the free electrons in the focal volume and the nanoplasmas inside the cluster was observed.

scholarly journals Reduction of laser-intensity-correlated noise in high-harmonic generation

2019 ◽  
Vol 27 (6) ◽  
pp. 7886
Author(s):  
Mikhail Volkov ◽  
Justinas Pupeikis ◽  
Christopher R. Phillips ◽  
Fabian Schlaepfer ◽  
Lukas Gallmann ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Laser Intensity ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Correlated Noise

Reduction of Laser-Intensity-Correlated Noise in High-Harmonic Generation

2019 ◽  
Author(s):  
Mikhail Volkov ◽  
Justinas Pupeikis ◽  
Christopher R. Phillips ◽  
Fabian Schlaepfer ◽  
Lukas Gallmann ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Laser Intensity ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Correlated Noise

scholarly journals Quasi-phase-matched high harmonic generation in structured plasmas

2019 ◽  
Vol 205 ◽  
pp. 02010
Author(s):  
Michael Wöstmann ◽  
Lukas Splitthoff ◽  
Helmut Zacharias
Keyword(s):  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Plasma Jets ◽  
Plasma Structure ◽  
Maximum Enhancement ◽  
Harmonic Intensity ◽  
High Harmonics

Structured plasmas are employed in order to realize the quasi-phase-matched generation of high harmonics. The plasma originates from laser ablated solids leading to the appearance of multiple separated jets. By altering the shape of the solid the dimensions of the plasma structure are easily optimized. Combining optimal jet widths and spacing the maximum enhancement of the harmonic intensity by a factor of 16 is observed after four plasma jets.

scholarly journals High-harmonic generation in one-dimensional Mott insulators

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Yuta Murakami ◽  
Shintaro Takayoshi ◽  
Akihisa Koga ◽  
Philipp Werner
Keyword(s):  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Mott Insulators ◽  
One Dimensional

scholarly journals Few-Cycle Infrared Pulse Evolving in FEL Oscillators and Its Application to High-Harmonic Generation for Attosecond Ultraviolet and X-ray Pulses

Atoms ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 15
Author(s):  
Ryoichi Hajima
Keyword(s):  
Harmonic Generation ◽  
Short Pulse ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Pulse Generation ◽  
Solid State Lasers ◽  
Linear Accelerators ◽  
X Ray ◽  
Ultrafast Science ◽  
Historical Remarks

Generation of few-cycle optical pulses in free-electron laser (FEL) oscillators has been experimentally demonstrated in FEL facilities based on normal-conducting and superconducting linear accelerators. Analytical and numerical studies have revealed that the few-cycle FEL lasing can be explained in the frame of superradiance, cooperative emission from self-bunched systems. In the present paper, we review historical remarks of superradiance FEL experiments in short-pulse FEL oscillators with emphasis on the few-cycle pulse generation and discuss the application of the few-cycle FEL pulses to the scheme of FEL-HHG, utilization of infrared FEL pulses to drive high-harmonic generation (HHG) from gas and solid targets. The FEL-HHG enables one to explore ultrafast science with attosecond ultraviolet and X-ray pulses with a MHz repetition rate, which is difficult with HHG driven by solid-state lasers. A research program has been launched to develop technologies for the FEL-HHG and to conduct a proof-of-concept experiment of FEL-HHG.

scholarly journals Transient absorption spectroscopy using high harmonic generation: a review of ultrafast X-ray dynamics in molecules and solids

2019 ◽  
Vol 377 (2145) ◽  
pp. 20170463 ◽  
Author(s):  
Romain Geneaux ◽  
Hugo J. B. Marroux ◽  
Alexander Guggenmos ◽  
Daniel M. Neumark ◽  
Stephen R. Leone
Keyword(s):  
Time Scales ◽  
Harmonic Generation ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Transient Absorption Spectroscopy ◽  
Spectroscopic Techniques ◽  
X Rays ◽  
X Ray

Attosecond science opened the door to observing nuclear and electronic dynamics in real time and has begun to expand beyond its traditional grounds. Among several spectroscopic techniques, X-ray transient absorption spectroscopy has become key in understanding matter on ultrafast time scales. In this review, we illustrate the capabilities of this unique tool through a number of iconic experiments. We outline how coherent broadband X-ray radiation, emitted in high-harmonic generation, can be used to follow dynamics in increasingly complex systems. Experiments performed in both molecules and solids are discussed at length, on time scales ranging from attoseconds to picoseconds, and in perturbative or strong-field excitation regimes. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

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