Design Study of Time-Preserving Grating Monochromators for Ultrashort Pulses in the Extreme-Ultraviolet and Soft X-Rays

Frassetto, Fabio; Fabris, Nicola; Miotti, Paolo; Poletto, Luca

doi:10.3390/photonics4010014

Cited by 13 publications

(12 citation statements)

References 40 publications

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“…The Fourier-transform limit (FTL) of such EUV pulse is shorter than 10 fs. Even though compression to the FTL value is not feasible, by using a time-delay compensated monochromator with our current bandwidth one could achieve pulse durations shorter than the vibrational period of the relevant molecular states (for the price of reduced EUV photon flux) [32,33]. This would allow combining state-selectivity with time resolution better than the vibrational period, thus, enabling KER vs frequency analysis similar to the one presented in [13,22].…”

Section: Discussionmentioning

confidence: 99%

“…Despite obvious advantages provided by using short pulses, because of their large bandwidth such sources, similar to the NIR pulses, are not well-suited for state-selective excitation. Therefore, considerable effort is made to generate rather narrow-band light pulses with both, FELs [30][31][32] and HHG sources [32][33][34][35][36], while still maintaining femtosecond pulse duration, short enough to resolve molecular dynamics of interest.…”

Section: Introductionmentioning

confidence: 99%

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State-selective dissociation dynamics of an oxygen molecular ion studied with single-harmonic pump and infrared-probe pulses

et al. 2018

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Laser-induced dissociation of a photoionized oxygen molecule is studied employing an extreme ultraviolet (EUV) pumpnear-infrared (NIR) probe technique. A combination of a narrow-band 11 th harmonic pump centered at 17.3 eV and a moderate-intensity NIR probe restricts the dissociation dynamics to the pair of low-lying cationic states, the 4 u a  and the 4 g f . The measured kinetic energies of the O + fragments reveal contributions from one-, two-and threephoton dissociation pathways (1 , 2 and 3) involving these two states. While the yields of the two-and three-photon channels initially rise and then decrease as a function of EUV-NIR delay, the yield of the single-photon pathway rises slower but keeps increasing over the whole delay range studied. This behavior reflects the evolving probability density of the ionic nuclear wave packet at the internuclear distances, where it can undergo resonant 3 and 1 transitions from the 4 u a  to the 4 g f  state of O2 + .

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

State-selective dissociation dynamics of an oxygen molecular ion studied with single-harmonic pump and infrared-probe pulses

et al. 2018

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“…For experiments at the MAC end-station that require a monochromatized beam, a time-preserving grating monochromator is implemented [21,40,42,43] grating in an off-plane diffraction geometry. With this geometry the wavefront tilt is less pronounced than in a classical diffraction mount [42,43], see Table 1. Slots for four gratings are mounted on a motorized stage in the monochromator vacuum chamber allowing a quick exchange of a grating.…”

Section: End-station Overview 21 General Layout Of the Beamlinementioning

confidence: 99%

A multipurpose end-station for atomic, molecular and optical sciences and coherent diffractive imaging at ELI beamlines

Klimešová

Kulyk

Hoque

et al. 2021

Eur. Phys. J. Spec. Top.

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We report on the status of a users’ end-station, MAC: a Multipurpose station for Atomic, molecular and optical sciences and Coherent diffractive imaging, designed for studies of structure and dynamics of matter in the femtosecond time-domain. MAC is located in the E1 experimental hall on the high harmonic generation (HHG) beamline of the ELI Beamlines facility. The extreme ultraviolet beam from the HHG beamline can be used at the MAC end-station together with a synchronized pump beam (which will cover the NIR/Vis/UV or THz range) for time-resolved experiments on different samples. Sample delivery systems at the MAC end-station include a molecular beam, a source for pure or doped clusters, ultrathin cylindrical or flat liquid jets, and focused beams of substrate-free nanoparticles produced by an electrospray or a gas dynamic virtual nozzle combined with an aerodynamic lens stack. We further present the available detectors: electron/ion time-of-flight and velocity map imaging spectrometers and an X-ray camera, and discuss future upgrades: a magnetic bottle electron spectrometer, production of doped nanodroplets and the planned developments of beam capabilities at the MAC end-station.

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“…For these purposes, a grating monochromator with high energy resolution, i.e., below 20 meV bandwidth, has been realized using an innovative cost-effective design. Different from low-resolution monochromators for HHs [9], in addition to the exit slit, an entrance slit is provided in order to have a reliable energy calibration almost independent from the source alignment [10,11]. Spherical-grating monochromators (SGM) made up of a single optical element are widely adopted for third-generation synchrotron sources, achieving resolving powers greater than 10 4 [12,13].…”

Section: Introductionmentioning

confidence: 99%

A High Resolution XUV Grating Monochromator for the Spectral Selection of Ultrashort Harmonic Pulses

et al. 2019

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A new monochromator with high spectral resolution in the extreme ultraviolet (XUV) has been developed for high-order laser harmonics selection. The system has three optical elements—a cylindrical (or spherical) focusing mirror, a uniform-line-spaced plane grating, and a plane mirror. The last element is required to maintain the focus on a fixed vertical slit when the grating subtended angle is changed in order to minimize the spectral defocusing aberration. The parameters of the focusing mirror are determined to introduce a coma that compensates for the coma given by the grating. The possibility of using two interchangeable gratings made the set-up optimized for a broad energy range of 12–50 eV. As a design test case, the set-up has been applied to a selection of the discrete spectral lines emitted by a gas-discharge lamp as the XUV source, obtaining a resolving power E/ Δ E > 3000.

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Design Study of Time-Preserving Grating Monochromators for Ultrashort Pulses in the Extreme-Ultraviolet and Soft X-Rays

Cited by 13 publications

References 40 publications

State-selective dissociation dynamics of an oxygen molecular ion studied with single-harmonic pump and infrared-probe pulses

State-selective dissociation dynamics of an oxygen molecular ion studied with single-harmonic pump and infrared-probe pulses

A multipurpose end-station for atomic, molecular and optical sciences and coherent diffractive imaging at ELI beamlines

A High Resolution XUV Grating Monochromator for the Spectral Selection of Ultrashort Harmonic Pulses

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