scholarly journals Focusing Properties of High-Order Harmonics

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Maria Hoflund ◽  
Jasper Peschel ◽  
Marius Plach ◽  
Hugo Dacasa ◽  
Kévin Veyrinas ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Laser System ◽  
High Order ◽  
Harmonic Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic ◽  
Attosecond Pulses ◽  
Small Focus ◽  
The Individual ◽  
Focusing Properties

Many applications of the extreme ultraviolet (XUV) radiation obtained by high-order harmonic generation (HHG) in gases require a small focus area in order to enable attosecond pulses to reach a high intensity. Here, high-order harmonics generated in Ar with a multiterawatt laser system in a loose focusing geometry are focused to a few micrometers using two toroidal mirrors in a Wolter configuration with a high demagnification factor. Using a knife-edge measurement technique, we determine the position and size of the XUV foci as a function of harmonic order. We show that the focus properties vary with harmonic order and the generation conditions. Simulations, based on a classical description of the harmonic dipole phase and assuming that the individual harmonics can be described as Gaussian beams, reproduce the experimental behavior. We discuss how the generation geometry affects the intensity and duration of the focused attosecond pulses.

scholarly journals Attosecond source generation using polarized gating two-color field combined with unipolar pulse

2016 ◽  
Vol 94 (7) ◽  
pp. 651-658 ◽  
Author(s):  
Liqiang Feng ◽  
Hang Liu
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
Harmonic Spectrum ◽  
High Order ◽  
High Order Harmonic Generation ◽  
Emission Process ◽  
Harmonic Emission ◽  
High Order Harmonic ◽  
Unipolar Pulse ◽  
Color Field

High-order harmonic generation and attosecond extreme-ultraviolet source generation have been theoretically investigated by controlling the two-color polarized gating field combined with the unipolar pulse. The results show that by properly optimizing the polarized two-color field as well as the unipolar pulse, not only is the harmonic cutoff remarkably extended, but the single short quantum path has also been selected to contribute to the harmonic spectrum, resulting in a 313 eV less modulated supercontinuum. Classical and quantum analyses are shown to explain the harmonic emission process. Finally, the proper superposition of harmonics, a series of isolated sub-50 as pulses, can be obtained.

Construction of an extreme ultraviolet polarimeter based on high-order harmonic generation

2006 ◽  
Author(s):  
N. Brimhall ◽  
J. C. Painter ◽  
M. Turner ◽  
S. V. Voronov ◽  
R. S. Turley ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

scholarly journals An extreme ultraviolet interferometer using high order harmonic generation

2014 ◽  
Vol 488 (1) ◽  
pp. 012019
Author(s):  
D E Laban ◽  
A J Palmer ◽  
W C Wallace ◽  
N S Gaffney ◽  
R P M J W Notermans ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic

scholarly journals Characterization of a dual-gas multi-jet gas puff target for high-order harmonic generation using extreme ultraviolet shadowgraphy

2013 ◽  
Vol 31 (2) ◽  
pp. 219-227 ◽  
Author(s):  
P.W. Wachulak ◽  
L. Wegrzynski ◽  
A. Bartnik ◽  
T. Fok ◽  
R. Jarocki ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Order ◽  
High Order Harmonic Generation ◽  
Density Profiles ◽  
Modes Of Operation ◽  
High Order Harmonic ◽  
Pulsed Injection ◽  
First Time

AbstractCharacterization measurements and modes of operation of a novel, dual-gas multi-jet target, developed for experiments on high-order harmonic generation, are presented. The target has been formed by pulsed injection of argon through a nozzle in a form of linearly oriented small orifices. The argon jets were separated with the helium jets formed by injection of helium through alternate orifices in the nozzle. The targets have been characterized by extreme ultraviolet backlighting at 13.5 nm wavelength. Density profiles for this type of targets have been obtained, to our knowledge, for the first time.

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