Grating Configurations for the Spectral Selection of Coherent Ultrashort Pulses in the Extreme-Ultraviolet

Frassetto, Fabio; Miotti, Paolo; Poletto, Luca

doi:10.3390/photonics1040442

Cited by 7 publications

(9 citation statements)

References 32 publications

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“…a) Cluster source, Naoven chamber, and photoelectron/mass spectrometer. b) UV and EUV laser light source with high harmonic generation (HHG) and HH monochromator 51,52 . BS: beam splitter, / 2  : half-wave plate, L: focusing lens, GC: gas cell, TM1, TM2 and TM3: toroidal mirrors, q in /q out : input/output arms, G: grating,  : altitude angle, S: exit slit.…”

Section: Methodsmentioning

confidence: 99%

“…1b). A home-built time-preserving monochromator in the off-plane mount geometry following the design by Poletto and coworkers 51,52 was used for the spectral selection of the HHs. Depending on the operation parameters, the monochromator provides photon fluxes between 10 8 and 10 11 photons/s at the output with EUV pulse durations between 50fs and 80fs 55 .…”

Section: Methodsmentioning

confidence: 99%

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Electron scattering in large water clusters from photoelectron imaging with high harmonic radiation

Gartmann

Hartweg

Ban

et al. 2018

Phys. Chem. Chem. Phys.

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Low-energy electron scattering in water clusters (H2O)n with average cluster sizes of n < 700 is investigated by angle-resolved photoelectron spectroscopy using high harmonic radiation at photon energies of 14.0, 20.3, and 26.5 eV for ionization from the three outermost valence orbitals. The measurements probe the evolution of the photoelectron anisotropy parameter β as a function of cluster size. A remarkably steep decrease of β with increasing cluster size is observed, which for the largest clusters reaches liquid bulk values. Detailed electron scattering calculations reveal that neither gas nor condensed phase scattering can explain the cluster data. Qualitative agreement between experiment and simulations is obtained with scattering calculations that treat cluster scattering as an intermediate case between gas and condensed phase scattering.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Electron scattering in large water clusters from photoelectron imaging with high harmonic radiation

Gartmann

Hartweg

Ban

et al. 2018

Phys. Chem. Chem. Phys.

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“…After di raction at the grating, the light is focused by T3 into the exit plane, where a slit de nes the energy resolution. For the use of the fs XUV pulses in time resolving experiments, we make use of a special monochromator geometry to minimize pulse broadening e ects (Fabio Frassetto & Poletto, 2014). Passing through a grating monochromator a ects the pulse length in two ways: (1) the monochromator acts as a frequency bandpass with a nite bandwidth.…”

Section: Beamlinementioning

confidence: 99%

“…(2) the di raction at a grating adds a geometric broadening of the pulse time pro le due to di erent optical pathlenths. We adopt the design described in (Fabio Frassetto & Poletto, 2014) as o -plane-mounting, which minimizes the second e ect by orienting the gratings grooves along the light incidence direction. To minimize the rst e ect, we design the monochromator to have an energy resolution that is just su cient to separate adjacent harmonic lines.…”

Section: Beamlinementioning

confidence: 99%

JuSPARC - The Jülich Short-Pulsed Particle and Radiation Center

Büscher

Adam

Tusche

et al. 2020

JLSRF

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JuSPARC, the Jülich Short-Pulsed Particle and Radiation Center, is a laser-driven facility to enable research with short-pulsed photon and particle beams to be performed at the Forschungszentrum Jülich. The conceptual design of JuSPARC is determined by a set of state-of-the-art time-resolved instruments, which are designed to address the electronic, spin, and structural states of matter and their dynamic behaviour. From these instruments and experiments JuSPARC derives the need of operating several dedicated high pulse-power laser systems at highest possible repetition rates. They serve as core units for optimized photon up-conversion techniques generating the light pulses for the respective experiments. The applications also include experiments with spin polarized particle beams, which require the use of laser-based polarized gas targets. Thus, in its rst stage JuSPARC comprises four driving laser systems, called JuSPARC_VEGA, JuSPARC_DENEB, JuSPARC_SIRIUS and JuSPARC_MIRA, which are outlined in this article.

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“…The new rotation scheme enables the construction of such a monochromator using only two plane grating reflections, eliminating the need for the additional two concave mirrors employed with current state-of-the-art time-compensated monochromators [18].…”

Section: A Two-element Time-compensated Monochromatormentioning

confidence: 99%

A Single-Element Plane Grating Monochromator

Hettrick¹

2016

Photonics

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Concerted rotations of a self-focused varied line-space diffraction grating about its groove axis and surface normal define a new geometric class of monochromator. Defocusing is canceled, while the scanned wavelength is reinforced at fixed conjugate distances and horizontal deviation angle. This enables high spectral resolution over a wide band, and is of particular advantage at grazing reflection angles. A new, rigorous light-path formulation employs non-paraxial reference points to isolate the lateral ray aberrations, with those of power-sum ď 3 explicitly expanded for a plane grating. Each of these 14 Fermat equations agrees precisely with the value extracted from numerical raytrace simulations. An example soft X-ray design (6˝deviation angle and 2ˆ4 mrad aperture) attains a resolving power ą 25, 000 over a three octave scan range. The proposed rotation scheme is not limited to plane surfaces or monochromators, providing a new degree of freedom in optical design. Grating rotation about its third (meridional) axis may be employed to cancel vertical deflection of the diffracted beam while maintaining the above aberration correction. This enables a simpler (pure rotary) motion for the exit slit and a fixed beam direction both horizontally and vertically.

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Grating Configurations for the Spectral Selection of Coherent Ultrashort Pulses in the Extreme-Ultraviolet

Cited by 7 publications

References 32 publications

Electron scattering in large water clusters from photoelectron imaging with high harmonic radiation

Electron scattering in large water clusters from photoelectron imaging with high harmonic radiation

JuSPARC - The Jülich Short-Pulsed Particle and Radiation Center

A Single-Element Plane Grating Monochromator

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