Picosecond imaging of low-density plasmas by electron deflectometry

Centurion, Martin; Reckenthaeler, Peter; Krausz, Ferenc; Fill, Ernst E.

doi:10.1364/ol.34.000539

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…34,35 The expansion velocity thus can be calculated to be v e = a 0 / 2t 0 = 1.5ϫ 10 6 m / s. This time-resolved polarization measurement therefore provides an alternative means to visualize the expansion dynamics of a laser induced plasma, complementary to the electron deflectometry measurements. 31,32 The fast polarization change in Fig. 2͑b͒ corresponds to a plasma density at the center of the plasma N e0 = 4.5ϫ 10 18 cm −3 , in line with the estimation 36,37 based on our experimental conditions.…”

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confidence: 88%

“…30 The time dependent full width half maximum a͑t͒ = a 0 ͑1+t / t 0 ͒ and plasma density N e0 ͑t͒ = N e0 / ͑1+t / t 0 ͒ 2 at z = 0 reflect the ballisticlike transverse expansion of ionized electrons with velocity v e = a 0 / 2t 0 within the first hundred picoseconds as previously observed by electron deflectometry measurements. 31,32 The optical beam diameter is used to approximate the initial plasma width a 0 = 60 m. The longitudinal expansion is negligible. After the two-color field passes through P2, the induced phase change is ⌬ = ⌬ plasma − ⌬ air , where ⌬ air Ϸ 0 is the phase change during the propagation through the air over the plasma transverse diameter and ⌬ plasma ͑t͒ =2 800 / c͐ −ϱ ϱ ͓n 400 ͑z , t͒ − n 800 ͑z , t͔͒dz.…”

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confidence: 99%

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High-speed all-optical terahertz polarization switching by a transient plasma phase modulator

Wen

Daranciang

Lindenberg

2010

Applied Physics Letters

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We demonstrate high-speed all-optical polarization switching of broadband terahertz frequency electromagnetic fields with subpicosecond switch-on time. This is achieved through the use of a two-plasma configuration in an orthogonal geometry in which one plasma modulates the relative phase of a two-color optical pump field, enabling rapid terahertz polarization modulation at rates limited by the repetition-rate of the control pulse.

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confidence: 88%

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confidence: 99%

High-speed all-optical terahertz polarization switching by a transient plasma phase modulator

Wen

Daranciang

Lindenberg

2010

Applied Physics Letters

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“…The deection typically grows on a scale of picoseconds. 36,37 It was not clear whether this method could also be applied to relativistic electrons with MeV energies because they need higher elds to be deected on the detector. We have seen, however, that the method works very well and time-zero can be determined with an accuracy of approximately 200 fs.…”

Section: Finding the Temporal Overlap Of Electron And Laser Pulsesmentioning

confidence: 99%

Femtosecond gas phase electron diffraction with MeV electrons

et al. 2016

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We present results on ultrafast gas electron diffraction (UGED) experiments with femtosecond resolution using the MeV electron gun at SLAC National Accelerator Laboratory. UGED is a promising method to investigate molecular dynamics in the gas phase because electron pulses can probe the structure with a high spatial resolution.Until recently, however, it was not possible for UGED to reach the relevant timescale for the motion of the nuclei during a molecular reaction. Using MeV electron pulses has allowed us to overcome the main challenges in reaching femtosecond resolution, namely delivering short electron pulses on a gas target, overcoming the effect of velocity mismatch between pump laser pulses and the probe electron pulses, and maintaining a low timing jitter. At electron kinetic energies above 3 MeV, the velocity mismatch between laser and electron pulses becomes negligible. The relativistic electrons are also less susceptible to temporal broadening due to the Coulomb force.One of the challenges of diffraction with relativistic electrons is that the small de Broglie wavelength results in very small diffraction angles. In this paper we describe the new setup and its characterization, including capturing static diffraction patterns of molecules in the gas phase, finding time-zero with sub-picosecond accuracy and first time-resolved diffraction experiments. The new device can achieve a temporal resolution of 100 fs root-mean-square, and sub-angstrom spatial resolution. The collimation of the beam is sufficient to measure the diffraction pattern, and the transverse coherence is on the order of 2 nm. Currently, the temporal resolution is limited both by the pulse duration of the electron pulse on target and by the timing jitter, while the spatial resolution is limited by the average electron beam current and Faraday DiscussionsCite this: DOI: 10.1039/c6fd00071a PAPER View Article OnlineView Journal the signal-to-noise ratio of the detection system. We also discuss plans for improving both the temporal resolution and the spatial resolution.

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Effect of an ultrafast laser induced plasma on a relativistic electron beam to determine temporal overlap in pump–probe experiments

Scoby

Musumeci

2013

Ultramicroscopy

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Picosecond imaging of low-density plasmas by electron deflectometry

Cited by 4 publications

References 18 publications

High-speed all-optical terahertz polarization switching by a transient plasma phase modulator

High-speed all-optical terahertz polarization switching by a transient plasma phase modulator

Femtosecond gas phase electron diffraction with MeV electrons

Effect of an ultrafast laser induced plasma on a relativistic electron beam to determine temporal overlap in pump–probe experiments

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