Waveform Control of Relativistic Electron Dynamics in Laser-Plasma Acceleration

Huijts, Julius; Rovige, Lucas; Andriyash, Igor; Vernier, Aline; Ouillé, Marie; Kaur, Jaismeen; Cheng, Ze; López-Martens, Rodrigo; Faure, Jérôme

doi:10.1103/physrevx.12.011036

Cited by 17 publications

(25 citation statements)

References 45 publications

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“…where v φ is the laser phase velocity, v g the laser group velocity, c the light velocity, and λ 0 the laser central wavelength. This slippage of the CEP causes the wake (or bubble) to oscillate transversally during the propagation on the length scale L 2π , which has been shown to trigger periodic offaxis injection of electron bunches in simulations [13][14][15] and in our recent experiment [16]. Our previous work demonstrated clear variations of the experimental beam pointing in the polarization direction with the CEP, attributed to the bubble transverse oscillation injection.…”

Section: Introductionmentioning

confidence: 58%

“…In our previous experiment [16], a slight beam charge variation depending on the CEP could be inferred, but it was dominated by higher amplitude CEP-independent charge variations during the scan. Moreover, the measured electron energy spectrum oscillated moderately with CEP, but the spectrometer geometry where the moving beam was sampled by a fixed pinhole did not allow to discriminate between an actual effect of the CEP on the spectrum, or just a difference of energy depending on the position sampled in the electron beam.…”

Section: Polarization Control In Nitrogenmentioning

confidence: 73%

“…Here, we operate in similar conditions as in [16], by using pure nitrogen gas with a plasma density n e = 8.3 × 10 19 cm −3 , with the added feature that we can now control the laser linear polarization direction by rotating a half-wave plate placed in the beam. A clear periodic dependence of the electron beam pointing on the CEP is observed, as shown in Fig.…”

Section: Polarization Control In Nitrogenmentioning

confidence: 99%

“…In our previous work [16], experiments were carried out solely in nitrogen to ensure high electron density while limiting the pumping load. While nitrogen is a high-Z gas that theoretically allows for ionization injection to occurs, our simulations indicated that the laser intensity remained too low throughout the interaction for this process to be significant.…”

Section: Carrier-envelope Phase Effects In Heliummentioning

confidence: 99%

“…While nitrogen is a high-Z gas that theoretically allows for ionization injection to occurs, our simulations indicated that the laser intensity remained too low throughout the interaction for this process to be significant. The beam pointing variations were therefore attributed to the CEP-dependent oscillations of the plasma wave asymmetry [11] which can trigger off-axis injection of electrons in the plasma bubble [13,15,16]. Carrying out the experiment in pure helium would allow to completely isolate this process unrelated to ionization injection, as helium is completely ionized at an intensity I 10 16 W cm −1 which is reached very early in the front of the pulse.…”

Section: Carrier-envelope Phase Effects In Heliummentioning

confidence: 99%

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Carrier-envelope phase controlled dynamics of relativistic electron beams in a laser-wakefield accelerator

Rovige,

Monzac,

Huijts

et al. 2022

Preprint

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In laser-wakefield acceleration, an ultra-intense laser pulse is focused into an underdense plasma in order to accelerate electrons to relativistic velocities. In most cases, the pulses consist of multiple optical cycles and the interaction is well described in the framework of the ponderomotive force where only the envelope of the laser has to be considered. But when using single-cycle pulses, the ponderomotive approximation breaks down, and the actual waveform of the laser has to be taken into account. In this paper, we use near-single cycle laser pulses to drive a laser-wakefield accelerator. We observe variations of the electron beam pointing on the order of 10 mrad in the polarisation direction, as well as 30% variations of the beam charge, locked to the value of the controlled laser carrierenvelope phase, in both nitrogen and helium plasma. Those findings are explained through particle-incell simulations indicating that low-emittance, ultra-short electron bunches are periodically injected off-axis by the transversally oscillating bubble associated with the slipping carrier-envelope phase.

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Section: Introductionmentioning

confidence: 58%

Section: Polarization Control In Nitrogenmentioning

confidence: 73%

Section: Polarization Control In Nitrogenmentioning

confidence: 99%

Section: Carrier-envelope Phase Effects In Heliummentioning

confidence: 99%

Section: Carrier-envelope Phase Effects In Heliummentioning

confidence: 99%

See 3 more Smart Citations

Carrier-envelope phase controlled dynamics of relativistic electron beams in a laser-wakefield accelerator

Rovige,

Monzac,

Huijts

et al. 2022

Preprint

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Optical Waveform Synthesis and Its Applications

Cirmi

Mainz

Silva‐Toledo

et al. 2023

Laser & Photonics Reviews

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The quest for ever‐shorter optical pulses has been ongoing for over half a century. Although few‐cycle pulses have been generated for nearly 40 years, pulse lengths below the single‐cycle limit have remained an elusive goal for a long time. For this purpose, optical waveform synthesizers, generating high‐energy, high‐average‐power pulses via coherent combination of multiple pulses covering different spectral regions, have been recently developed. They allow unprecedented control over the generated optical waveforms, spanning an extremely broad spectral range from ultraviolet to infrared. Such control allows for steering strong‐field interactions with increased degrees of freedom. When driving high‐harmonic generation, tailored waveforms can produce bright attosecond pulse trains and even isolated attosecond pulses with tunable spectra up to the soft X‐ray range. In this paper recent progress on parametric and hollow‐core fiber waveform synthesizers is discussed. Newly developed seeding schemes; absolute, relative, and spectral phase measurement; and control techniques suitable for synthesizers are described. The progress on serial and parallel waveform synthesis based on Ti:sapphire and Ytterbium laser systems and their latest applications in high‐harmonic generation in gaseous and solid media, attosecond science, and laser wakefield acceleration is discussed.

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Bubble structure evolution and electron injection controlled by optical cycles in wakefields

et al. 2023

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The evolution of bubble structure and electron injection in laser wakefield acceleration with different optical cycles is investigated through three-dimensional particle-in-cell simulations. Under fixed transverse and longitudinal ponderomotive force, the effect of optical cycles on the evolution of bubble structure and electron injection is studied by changing the laser wavelength. For a multi-cycle laser, electron acceleration is dominated by the ponderomotive force that produces symmetrical bubble and continuous injection. As the optical cycles decrease, the dominant effect of the electron acceleration can transition from the ponderomotive force to the carrier wave, and the carrier envelope phase shift can cause transverse oscillation of the bubble and periodic electron injection in the direction of laser polarization. The criterion for the dominant acceleration mechanism and the dependence of transition distance on the optical cycles and pulse width are obtained. The results are beneficial for manipulating electron acceleration and betatron radiation generation.

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Waveform Control of Relativistic Electron Dynamics in Laser-Plasma Acceleration

Cited by 17 publications

References 45 publications

Carrier-envelope phase controlled dynamics of relativistic electron beams in a laser-wakefield accelerator

Carrier-envelope phase controlled dynamics of relativistic electron beams in a laser-wakefield accelerator

Optical Waveform Synthesis and Its Applications

Bubble structure evolution and electron injection controlled by optical cycles in wakefields

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