Subpicosecond Ultracold Electron Source

Raadt, T. C. H. de; Franssen, J.G.H.; Luiten, O.J.

doi:10.1103/physrevlett.130.205001

Cited by 6 publications

(3 citation statements)

References 44 publications

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“… 8 Recently, pondermotive measurements have been performed in the self-compression point, resulting in rms bunch lengths of 735 ± 7 fs. 21 …”

Section: The Ultracold Electron Sourcementioning

confidence: 99%

RF acceleration of ultracold electron bunches

Nijhof,

de Raadt,

Huijts

et al. 2023

Structural Dynamics

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The ultrafast and ultracold electron source, based on laser cooling and trapping of atomic gas and its subsequent near-threshold two-step photoionization, is capable of generating electron bunches with a high transverse brightness at energies of roughly 10 keV. This paper investigates the possibility of increasing the range of applications of this source by accelerating the bunch using radio frequency electromagnetic fields. Bunch energies up to 35 keV are measured by analyzing the diffraction patterns generated from a mono-crystalline gold sample. It is found that the normalized transverse emittance is largely preserved during acceleration.

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“… 8 Recently, pondermotive measurements have been performed in the self-compression point, resulting in rms bunch lengths of 735 ± 7 fs. 21 …”

Section: The Ultracold Electron Sourcementioning

confidence: 99%

RF acceleration of ultracold electron bunches

Nijhof,

de Raadt,

Huijts

et al. 2023

Structural Dynamics

Self Cite

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“…The resolution of these methods could be boosted by using bunches that are ultracold and of subpicosecond duration, but scientists have struggled to make bunches with both of those properties. A new method from Tim de Raadt and his colleagues at Eindhoven University of Technology in the Netherlands changes the status quo [1]. The researchers say that their approach might help enable single-shot imaging of protein structures at the atomic level.…”

Section: By Ryan Wilkinsonmentioning

confidence: 99%

Electron Bunches Break the Picosecond Barrier

Wilkinson¹

2023

Physics

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“…An important aspect of realizing ultrafast pump-probe experiments is to have an accurate determination of time zero, i.e., the exact moment in time where the two types of pulses temporally overlap. This time zero is usually found using laser-induced plasmas, 17 ponderomotive scattering, 18 or laser-triggered blankers. 19 These processes typically have some inherent form of delay between the impact of the incident pulse and the signal generated and require temporal overlap between the pulses to obtain a signal.…”

Section: Introductionmentioning

confidence: 96%

Photodiode-based time zero determination for ultrafast electron microscopy

Kempers,

Borrelli,

Kieft

et al. 2023

Structural Dynamics

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Pump-probe experiments in ultrafast electron microscopy require temporal overlap between the pump and probe pulses. Accurate measurements of the time delay between them allows for the determination of the time zero, the moment in time where both pulses perfectly overlap. In this work, we present the use of a photodiode-based alignment method for these time zero measurements. The cheap and easy-to-use device consists of a photodiode in a sample holder and enables us to temporally align individual, single-electron pulses with femtosecond laser pulses. In a first device, a temporal resolution of 24 ps is obtained, limited by the photodiode design. Future work will utilize a smaller photodiode with a lower capacitance, which will increase the temporal resolution and add spatial resolution as well. This upgrade will bring the method toward the micrometer and picosecond spatiotemporal resolution.

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Subpicosecond Ultracold Electron Source

Cited by 6 publications

References 44 publications

RF acceleration of ultracold electron bunches

RF acceleration of ultracold electron bunches

Electron Bunches Break the Picosecond Barrier

Photodiode-based time zero determination for ultrafast electron microscopy

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