Carrier-envelope phase dependence in single-cycle laser pulse propagation with the inclusion of counter-rotating terms

The dependence of the high-order harmonic cutoff spectrum from the absolute phase of the laser pulse is here experimentally investigated. Noticeable shifts are observed. Their interpretation is proposed with a model based on the absolute-phase dependence of the trajectories of the photoelectrons that contribute to a given harmonic order.

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Ultrashort Laser Pulse Propagation in Water

10.21236/ada557246 ◽

2011 ◽

Author(s):

George W. Kattawar ◽

Alexei V. Sokolov

Keyword(s):

Laser Pulse ◽

Pulse Propagation ◽

Ultrashort Laser Pulse ◽

Ultrashort Laser

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Signatures of the Carrier Envelope Phase in Nonlinear Thomson Scattering

Crystals ◽

10.3390/cryst11050528 ◽

2021 ◽

Vol 11 (5) ◽

pp. 528

Author(s):

Marcel Ruijter ◽

Vittoria Petrillo ◽

Thomas C. Teter ◽

Maksim Valialshchikov ◽

Sergey Rykovanov

Keyword(s):

Laser Pulse ◽

Radiation Spectrum ◽

Thomson Scattering ◽

High Energy ◽

Phase Changes ◽

High Energy Radiation ◽

Carrier Envelope Phase ◽

High Intensity Laser ◽

Experimental Parameters ◽

Intensity Laser

High-energy radiation can be generated by colliding a relativistic electron bunch with a high-intensity laser pulse—a process known as Thomson scattering. In the nonlinear regime the emitted radiation contains harmonics. For a laser pulse whose length is comparable to its wavelength, the carrier envelope phase changes the behavior of the motion of the electron and therefore the radiation spectrum. Here we show theoretically and numerically the dependency of the spectrum on the intensity of the laser and the carrier envelope phase. Additionally, we also discuss what experimental parameters are required to measure the effects for a beamed pulse.

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Radial density profile and stability of capillary discharge plasma waveguides of lengths up to 40 cm

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.6 ◽

2021 ◽

Vol 9 ◽

Author(s):

M. Turner ◽

A. J. Gonsalves ◽

S. S. Bulanov ◽

C. Benedetti ◽

N. A. Bobrova ◽

...

Keyword(s):

Laser Pulse ◽

Electron Density ◽

Density Profile ◽

Pulse Propagation ◽

Spot Size ◽

Capillary Discharge ◽

Electron Density Profile ◽

Plasma Waveguide ◽

Wakefield Acceleration ◽

Plasma Wakefield

Abstract We measured the parameter reproducibility and radial electron density profile of capillary discharge waveguides with diameters of 650 $\mathrm{\mu} \mathrm{m}$ to 2 mm and lengths of 9 to 40 cm. To the best of the authors’ knowledge, 40 cm is the longest discharge capillary plasma waveguide to date. This length is important for $\ge$ 10 GeV electron energy gain in a single laser-driven plasma wakefield acceleration stage. Evaluation of waveguide parameter variations showed that their focusing strength was stable and reproducible to $<0.2$ % and their average on-axis plasma electron density to $<1$ %. These variations explain only a small fraction of laser-driven plasma wakefield acceleration electron bunch variations observed in experiments to date. Measurements of laser pulse centroid oscillations revealed that the radial channel profile rises faster than parabolic and is in excellent agreement with magnetohydrodynamic simulation results. We show that the effects of non-parabolic contributions on Gaussian pulse propagation were negligible when the pulse was approximately matched to the channel. However, they affected pulse propagation for a non-matched configuration in which the waveguide was used as a plasma telescope to change the focused laser pulse spot size.

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