Quantum dynamics of attosecond electron pulse compression

Baum, Peter

doi:10.1063/1.5006864

Cited by 39 publications

(35 citation statements)

References 43 publications

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“…L focus is a function of the compression strength and the laser frequency as given in Refs. [81,108]. We find from Eq.…”

Section: A Limit Of Pulse Durationmentioning

confidence: 82%

“…We assume for n e (t) a Gaussian temporal shape with a rms duration of ∆t e on top of a constant background density n BG and a peak density n 0 , hence n e (t) = n 0 exp(−t 2 /(2∆t 2 e ))+n BG . The background originates from such electrons that are initially located at non-converging half-cycles of the compression and therefore rather de-compressed than compressed [1,88,108]. By numerically fitting the four parameters, ∆x, φ offset , ∆t e and n BG /n 0 to the measured two-dimensional deflectograms (2500 data points), we obtain the attosecond electron density n e (t) and the pulse duration ∆t e .…”

Section: D Generation Of Attosecond Electron Pulsesmentioning

confidence: 99%

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Attosecond control of electron beams at dielectric and absorbing membranes

Morimoto

Baum

2018

Phys. Rev. A

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Ultrashort electron pulses are crucial for time-resolved electron diffraction and microscopy of fundamental light-matter interaction. In this work, we study experimentally and theoretically the generation and characterization of attosecond electron pulses by optical-field-driven compression and streaking at dielectric or absorbing interaction elements. The achievable acceleration and deflection gradient depends on the laser-electron angle, the laser's electric and magnetic field directions and the foil orientation. Electric and magnetic fields have similar contributions to the final effect and both need to be considered. Experiments and theory agree well and reveal the optimum conditions for highly efficient, velocity-matched electron-field interactions in longitudinal or transverse direction. We find that metallic membranes are optimum for light-electron control at mid-infrared or terahertz wavelengths, but dielectric membranes are excel in the visible/near-infrared regimes and are therefore ideal for the formation of attosecond electron pulses. arXiv:1801.07876v1 [physics.optics] 24 Jan 2018Here, e is elementary charge, t is time, r e and v e are the position and the velocity of the electron. The parameter

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“…L focus is a function of the compression strength and the laser frequency as given in Refs. [81,108]. We find from Eq.…”

Section: A Limit Of Pulse Durationmentioning

confidence: 82%

Section: D Generation Of Attosecond Electron Pulsesmentioning

confidence: 99%

Attosecond control of electron beams at dielectric and absorbing membranes

Morimoto

Baum

2018

Phys. Rev. A

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“…If the initial wavepacket before modulation is emitted from the electron source chirped, or acquires chirp due to transport to the modulation point, or by a controlled process by streaking technique [40,41], then the chirp acquired due to the dispersive transport after modulation will combine with this prior chirping. The two effects may add together to enhance the wavepacket widening, or with negative chirping-lead to compression of the wavepacket.…”

Section: Discussionmentioning

confidence: 99%

“…The classical point particle limit of stimulated superradiance (56b) is nothing but the acceleration formula in conventional particle accelerators. The classical superradiance formula (56a) is of interest primarily for THz radiation generation devices, since attainable short electron beam pulse durations (t pulse ) are in the order ofs 10 12 [40,41]. It is of less interest in the present context, since it has no quantum wavepacket dependence.…”

Section: Unmodulated Wavepackets Multi-electron Beammentioning

confidence: 99%

Spontaneous and stimulated radiative emission of modulated free-electron quantum wavepackets—semiclassical analysis

Pan¹,

Gover²

2018

J. Phys. Commun.

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Here we present a semiclassical analysis of spontaneous and stimulated radiative emission from unmodulated and optically-modulated free-electron quantum wavepackets. We show that the radiative emission/absorption and corresponding deceleration/acceleration of the wavepackets depend on the controllable 'history-dependent' wavepacket size. The characteristics of the radiative interaction when the wavepacket size (duration) is short relative to the radiation wavelength, are close to the predictions of the classical point-particle modelling. On the other hand, in the long-sized wavepacket limit, the interaction is quantum-mechanical, and it diminishes exponentially at high frequency. We exemplify these effects through the scheme of Smith-Purcell radiation, and demonstrate that if the wavepacket is optically-modulated and periodically-bunched, it exhibits finite radiative emission at harmonics of the modulation frequency beyond the limit of high-frequency cutoff. Besides, the radiation analysis is further extended to the cases of superradiant emission from a beam of phase-correlated modulated electron wavepackets. The features of the wavepacket-dependent radiative emission explain the classical-to-quantum transition, and indicate a way for measuring the quantum electron wavepacket size. This suggests a new direction for exploring light-matter interaction.

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“…Thus, the transition from the acceleration regime to APINEM and PINEM regimes, can be demonstrated experimentally only with a properly preselected ensemble of electrons in phase-space. Such may possibly be realizable with advancement of single electron wavepacket phase-space control and filtering based on optical (or THz) streaking techniques [18][19].…”

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confidence: 99%

Anomalous Photon-Induced Near-Field Electron Microscopy

2019

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We reveal the classical and quantum regimes of free electron interaction with radiation, common to the general variety of radiation sources (e.g. FEL, Smith-Purcell), Dielectric Laser Accelerator (DLA) and Photo-Induced Near-Field Electron Microscopy (PINEM). Modelling the electron with initial conditions of a coherent quantum electron wavepacket (QEW), its topology in phase-space uniquely defines a universal distinction of three interaction regimes (and their particle-wave duality transition): point-particle-like acceleration, quantum wavefunction (PINEM), and a newly reported regime of anomalous PINEM (APINEM). The quantum interference beat of APINEM is capable of improving the spectral resolution of post-selective electron microscopy, and the particle-wave duality transition reveals the history-dependent nature of quantum electron interaction with light.

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Quantum dynamics of attosecond electron pulse compression

Cited by 39 publications

References 43 publications

Attosecond control of electron beams at dielectric and absorbing membranes

Attosecond control of electron beams at dielectric and absorbing membranes

Spontaneous and stimulated radiative emission of modulated free-electron quantum wavepackets—semiclassical analysis

Anomalous Photon-Induced Near-Field Electron Microscopy

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