Solving the jitter problem in microwave compressed ultrafast electron diffraction instruments: Robust sub-50 fs cavity-laser phase stabilization

Otto, Martin; Cotret, Laurent P. René de; Stern, Mark J.; Siwick, Bradley J.

doi:10.1063/1.4989960

Cited by 60 publications

(45 citation statements)

References 27 publications

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“…A radio-frequency cavity is used to compress electron bunches to ≈ 150 fs at the sample, as measured by a home-built photoactivated streak camera 24 . More detailed descriptions of this instrument are given elsewhere [25][26][27] The interrogated film area covers 500 µm × 500 µm, with a pump spot of 1 mm × 1 mm full-width half-max (FWHM) ensuring nearly uniform illumination of the probed volume.…”

Section: Experimental and Computational Methodsmentioning

confidence: 99%

Time- and momentum-resolved phonon population dynamics with ultrafast electron diffuse scattering

et al. 2019

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Interactions between the lattice and charge carriers can drive the formation of phases and ordering phenomena that give rise to conventional superconductivity, insulator-to-metal transitions, and charge-density waves. These couplings also play a determining role in properties that include electric and thermal conductivity. Ultrafast electron diffuse scattering (UEDS) has recently become a viable laboratory-scale tool to track energy flow into and within the lattice system across the entire Brillouin zone, and to deconvolve interactions in the time domain. Here, we present a detailed quantitative framework for the interpretation of UEDS signals, ultimately extracting the phonon mode occupancies across the entire Brillouin zone. These transient populations are then used to extract momentum-and mode-dependent electron-phonon and phonon-phonon coupling constants. Results of this analysis are presented for graphite, which provides complete information on the phonon-branch occupations and a determination of the A 1 phonon mode-projected electronphonon coupling strength g 2 e,A 1 = 0.035 ± 0.001 eV 2 that is in agreement with other measurement techniques and simulations.

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Section: Experimental and Computational Methodsmentioning

confidence: 99%

Time- and momentum-resolved phonon population dynamics with ultrafast electron diffuse scattering

et al. 2019

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“…This is achieved by using a conjugate blanking scheme, resulting in high quality ultrashort pulses. Using state-of-theart synchronization systems, the microwave signal can be synchronized to a laser pulse [23][24][25] , allowing for pump-probe experiments to be performed with a high resolution.…”

Section: A Ultrafast Electron Microscopymentioning

confidence: 99%

Design and characterization of dielectric filled TM110 microwave cavities for ultrafast electron microscopy

Verhoeven

Rens

Kemper

et al. 2019

Review of Scientific Instruments

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“…The reported stability is on the order of ~ 10 fs, and the long-term arrival time stability of the electron pulse is < 50 fs. For more technical details, please refer to [129]. We expect that this advance will play a vital role in enhancing the temporal resolution for resolving faster atomic motion.…”

Section: Electron Pulse Compression Techniquesmentioning

confidence: 99%

Attomicroscopy: from femtosecond to attosecond electron microscopy

Hassan

2018

J. Phys. B: At. Mol. Opt. Phys.

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In the last decade, the development of Ultrafast Electron Diffraction (UED) and Microscopy (UEM) has enabled the imaging of atomic motion in real time and space. These pivotal table-top tools opened the door for a vast range of applications in different areas of science spanning chemistry, physics, materials science, and biology. We first discuss the basic principles and recent advancements, including some of the important applications, of both UED and UEM. Then, we discuss the recent advances in the field that have enhanced the spatial and temporal resolutions, where the latter, however, is still limited to a few hundreds of femtoseconds, preventing the imaging of ultrafast dynamics of matter on the scale of several tens of femtoseconds. Then, we present our new optical gating approach for generating an isolated 30 fs electron pulse with sufficient intensity to attain a temporal resolution on the same time scale. This achievement allows, for the first time, imaging the electron dynamics of matter. Finally, we demonstrate the feasibility of the optical gating approach to generate an isolated attosecond electron pulse, utilizing our recently demonstrated optical attosecond laser pulse, which paves the way for establishing the field of "Attomicroscopy", ultimately enabling us to image the electron motion in action.Keywords: Attomicroscopy, attosecond electron pulse, 4D electron microscopy, femtosecond electron diffraction, Ultrafast Electron Microscopy, optical gating, imaging the electron motion. electron pulse to hundred femtoseconds; however, they suffer from time jittering and the temporal synchronization issues, which limit the temporal resolution in time-resolved electron experiments. Therefore, the ultrafast dynamics measurements that have been carried out so far are on the timescale of picoseconds to several hundreds of femtoseconds [21][22][23][24][25]. Hence, imaging of faster dynamics (i.e., electron dynamics) in matter still remains beyond reach.Recently, we demonstrated generation of the shortest electron pulse (30 fs) in UEM by the optical gating approach, which breaks the conventional compression limits for an electron pulse and attains electron-dynamics-scale temporal resolution in electron microscopy [26]. In this approach, the generated gated electron pulse duration is limited only by the gating laser pulse, which could be on the attosecond time scale [27]. This approach might eventually lead to the generation of isolated attosecond electron pulses and could open the way for establishing a new "Attomicroscopy" field [26]. It will allow the realtime imaging of electronic motion as theoretically studied in atoms, molecules [28], and condensed matter [29], which could radically change our insight into the workings of the microcosm and could hold the promise for breaking new grounds in a number of fields of science and technology.This review article provides an overview of the developments in the fields of time-resolved electron diffraction and microscopy. The article is structured as follows. Afte...

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Solving the jitter problem in microwave compressed ultrafast electron diffraction instruments: Robust sub-50 fs cavity-laser phase stabilization

Cited by 60 publications

References 27 publications

Time- and momentum-resolved phonon population dynamics with ultrafast electron diffuse scattering

Time- and momentum-resolved phonon population dynamics with ultrafast electron diffuse scattering

Design and characterization of dielectric filled TM110 microwave cavities for ultrafast electron microscopy

Attomicroscopy: from femtosecond to attosecond electron microscopy

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