scholarly journals Reconstruction of few-fs XUV pulses with a perturbative approach

2021 ◽  
Vol 255 ◽  
pp. 11008
Author(s):  
Bruno Moio ◽  
Fabio Medeghini ◽  
Gian Luca Dolso ◽  
Giacomo Inzani ◽  
Nicola Di Palo ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Measurement Procedure ◽  
Ultrafast Dynamics ◽  
Perturbative Approach ◽  
Pump Probe ◽  
Physical Systems ◽  
Require Time ◽  
Perturbative Regime ◽  
Pump Probe Experiment

A precise temporal characterization of the pulses involved in pump-probe experiments is crucial for a proper investigation of the ultrafast dynamics in several physical systems. Indeed, it is required for the assessment of the dynamical properties under examination with sufficient temporal resolution. In the fewfs/attosecond domain, typical reconstruction procedures require time-consuming interative methods, which are also sensitive to the experimental noise and to the distortion of the measurement. We developed an approach, called Simplified Trace Reconstruction In the Perturbative regimE (STRIPE), which allows us for a precise characterization of the infrared (IR) and extreme ultraviolet (XUV) pulses, used in a pump-probe experiment. Our method is not based on a phase retrival algorithm, and for this it is typically much faster than the other ones currently known. Moreover, it allows for easily including in the reconstruction the experimental non-idealities that may affect the measurement, like possible distortion due to the measurement procedure itself.

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.

Characterization of objects arrangement in image analysis of physical systems

Vacuum ◽  
2007 ◽  
Vol 82 (2) ◽  
pp. 282-285 ◽  
Author(s):  
Dušan Novotný ◽  
Rudolf Hrach ◽  
Michal Kostern
Keyword(s):  
Image Analysis ◽  
Physical Systems

Femtosecond pump-probe characterization of high-pressure grown Al x Ga 1-x N single crystals

2009 ◽  
Author(s):  
Jie Zhang ◽  
A. Belousov ◽  
S. Katrych ◽  
J. Jun ◽  
J. Karpinski ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Pump Probe

At-wavelength, system-level flare characterization of extreme-ultraviolet optical systems

2000 ◽  
Vol 39 (17) ◽  
pp. 2941 ◽  
Author(s):  
Patrick Naulleau ◽  
Kenneth A. Goldberg ◽  
Eric M. Gullikson ◽  
Jeffrey Bokor
Keyword(s):  
Extreme Ultraviolet ◽  
System Level ◽  
Optical Systems

Collinear pump probe experiment, novel approach to ultrafast spectroscopy

1999 ◽  
Vol 68 (4) ◽  
pp. 689-692 ◽  
Author(s):  
B. Bousquet ◽  
L. Canioni ◽  
J. Plantard ◽  
L. Sarger
Keyword(s):  
Ultrafast Spectroscopy ◽  
Pump Probe ◽  
Novel Approach ◽  
Probe Experiment ◽  
Pump Probe Experiment

scholarly journals A Brief Review of Generalized Entropies

Entropy ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 813 ◽  
Author(s):  
José Amigó ◽  
Sámuel Balogh ◽  
Sergio Hernández
Keyword(s):  
Diffusion Processes ◽  
Complex Dynamics ◽  
Probability Distributions ◽  
Point Of View ◽  
Scaling Exponent ◽  
Scaling Exponents ◽  
Physical Systems ◽  
New Phenomena ◽  
Generalized Entropies

Entropy appears in many contexts (thermodynamics, statistical mechanics, information theory, measure-preserving dynamical systems, topological dynamics, etc.) as a measure of different properties (energy that cannot produce work, disorder, uncertainty, randomness, complexity, etc.). In this review, we focus on the so-called generalized entropies, which from a mathematical point of view are nonnegative functions defined on probability distributions that satisfy the first three Shannon–Khinchin axioms: continuity, maximality and expansibility. While these three axioms are expected to be satisfied by all macroscopic physical systems, the fourth axiom (separability or strong additivity) is in general violated by non-ergodic systems with long range forces, this having been the main reason for exploring weaker axiomatic settings. Currently, non-additive generalized entropies are being used also to study new phenomena in complex dynamics (multifractality), quantum systems (entanglement), soft sciences, and more. Besides going through the axiomatic framework, we review the characterization of generalized entropies via two scaling exponents introduced by Hanel and Thurner. In turn, the first of these exponents is related to the diffusion scaling exponent of diffusion processes, as we also discuss. Applications are addressed as the description of the main generalized entropies advances.

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