Generation of high-order harmonics at 100 kHz for attosecond science experiments

2018 ◽  
Author(s):  
Federico J. Furch ◽  
Felix Schell ◽  
Tobias Witting ◽  
Peter Šušnjar ◽  
Fabio Cavalcante ◽  
...  
Keyword(s):  
High Order ◽  
Attosecond Science

scholarly journals Optics-less focusing of XUV high-order harmonics

2019 ◽  
Vol 5 (4) ◽  
pp. eaau7175 ◽  
Author(s):  
L. Quintard ◽  
V. Strelkov ◽  
J. Vabek ◽  
O. Hort ◽  
A. Dubrouil ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Order ◽  
Experimental Measurements ◽  
Harmonic Order ◽  
High Order Harmonic ◽  
Gas Medium ◽  
Beam Characteristics ◽  
Attosecond Science ◽  
Good Agreement

By experimentally studying high-order harmonic beams generated in gases, we show how the spatial characteristics of these ultrashort extreme-ultraviolet (XUV) beams can be finely controlled when a single fundamental beam generates harmonics in a thin gas medium. We demonstrate that these XUV beams can be emitted as converging beams and thereby get focused after generation. We study this optics-less focusing using a spatially chirped beam that acts as a probe located inside the harmonic generation medium. We analyze the XUV beam evolution with an analytical model and obtain very good agreement with experimental measurements. The XUV foci sizes and positions vary strongly with the harmonic order, and the XUV waist can be located at arbitrarily large distances from the generating medium. We discuss how intense XUV fields can be obtained with optics-less focusing and how the order-dependent XUV beam characteristics are compatible with broadband XUV irradiation and attosecond science.

Nonlinear optics for high-order frequency conversion: applied attosecond science

2007 ◽  
Author(s):  
X. Zhang ◽  
A. L. Lytle ◽  
D. Gaudiosi ◽  
T. Popmintchev ◽  
H. C. Kapteyn ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Frequency Conversion ◽  
High Order ◽  
Attosecond Science

High Order Harmonics Driven by 1.5-µm Parametric Source: a Tool for Attosecond Science

2010 ◽  
Author(s):  
C. Vozzi ◽  
M. Negro ◽  
F. Calegari ◽  
F. Frassetto ◽  
M. Nisoli ◽  
...  
Keyword(s):  
High Order ◽  
Parametric Source ◽  
Attosecond Science

Determination of the Burgers vector of a dislocation in a Fe-Mn alloy by weak-beam image in HVEM

1978 ◽  
Vol 36 (1) ◽  
pp. 330-331
Author(s):  
Y. Ishida ◽  
H. Ishida ◽  
K. Kohra ◽  
H. Ichinose
Keyword(s):  
High Order ◽  
Simulation Technique ◽  
The Other ◽  
Image Simulation ◽  
Diffraction Vector ◽  
Burgers Vector ◽  
Weak Beam ◽  
Beam Image ◽  
Edge Component

IntroductionA simple and accurate technique to determine the Burgers vector of a dislocation has become feasible with the advent of HVEM. The conventional image vanishing technique(1) using Bragg conditions with the diffraction vector perpendicular to the Burgers vector suffers from various drawbacks; The dislocation image appears even when the g.b = 0 criterion is satisfied, if the edge component of the dislocation is large. On the other hand, the image disappears for certain high order diffractions even when g.b ≠ 0. Furthermore, the determination of the magnitude of the Burgers vector is not easy with the criterion. Recent image simulation technique is free from the ambiguities but require too many parameters for the computation. The weak-beam “fringe counting” technique investigated in the present study is immune from the problems. Even the magnitude of the Burgers vector is determined from the number of the terminating thickness fringes at the exit of the dislocation in wedge shaped foil surfaces.

The usefulness of high index low symmetry zone axes for holz line analysis

1987 ◽  
Vol 45 ◽  
pp. 384-385
Author(s):  
C. M. Sung ◽  
D. B. Williams
Keyword(s):  
Lattice Parameter ◽  
High Order ◽  
Zone Axis ◽  
High Index ◽  
High Symmetry ◽  
Second Phases ◽  
Line Patterns ◽  
Low Symmetry ◽  
Line Analysis

Researchers have tended to use high symmetry zone axes (e.g. <111> <114>) for High Order Laue Zone (HOLZ) line analysis since Jones et al reported the origin of HOLZ lines and described some of their applications. But it is not always easy to find HOLZ lines from a specific high symmetry zone axis during microscope operation, especially from second phases on a scale of tens of nanometers. Therefore it would be very convenient if we can use HOLZ lines from low symmetry zone axes and simulate these patterns in order to measure lattice parameter changes through HOLZ line shifts. HOLZ patterns of high index low symmetry zone axes are shown in Fig. 1, which were obtained from pure Al at -186°C using a double tilt cooling holder. Their corresponding simulated HOLZ line patterns are shown along with ten other low symmetry orientations in Fig. 2. The simulations were based upon kinematical diffraction conditions.

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