Temporal contrast control at the PHELIX petawatt laser facility by means of tunable sub-picosecond optical parametric amplification

Wagner, F.; João, C. P.; Fils, J.; Gottschall, Thomas; Hein, Joachim; Körner, Jörg; Limpert, Jens; Roth, Markus; Stöhlker, Thomas; Bagnoud, V.

doi:10.1007/s00340-013-5714-9

Cited by 55 publications

(44 citation statements)

References 16 publications

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“…A typical time structure of the petawatt class laser pulse is shown in Figure 4 of (Wagner et al, 2014b), where the pulse shape of the PHELIX laser at the first harmonic, λ 0 = 1.053 μm, is shown for different parameters of the contrast boosting module. For simulation of the laser-matter interaction at non-relativistic prepulse intensities, we have elaborated and used the two-temperature single-fluid radiation hydrodynamic model (Povarnitsyn et al, 2012a(Povarnitsyn et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

et al. 2015

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Generation of hot electrons at grazing incidence of a subpicosecond relativistic-intense laser pulse onto a plane solid target is analyzed for the parameters of petawatt class laser systems. We study preplasma formation on the surface of solid aluminum targets produced by laser prepulses with a different time structure. For modeling of the preplasma dynamics, we use a wide-range two-temperature hydrodynamic model. As a result of simulations, the preplasma expansion under the action of the laser prepulse and the plasma density profiles for different contrast ratios of the nanosecond pedestal are found. These density profiles are used as the initial density distributions in three-dimensional particle-in-cell simulations of electron acceleration by the main P-polarized laser pulse. Results of modeling demonstrate a substantial increase of the characteristic energy and number of accelerated electrons for the grazing incidence of a subpicosecond intense laser pulse in comparison with the ponderomotive scaling of laser-target interaction.

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Section: Introductionmentioning

confidence: 99%

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

et al. 2015

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“…McKenna and Carroll et al [16,17] show a long, shallow density gradient measured using interferometry of a probe beam across the front surface of the target. Wagner et al [18] characterised the contrast of the PHELIX laser and its effects on the preplasma [19] by measuring the expansion of the plasma using shadowgraphy of a probe beam. These two sources provide sufficient information to make a first estimate of the pre-plasma.…”

Section: D Epoch Simulationsmentioning

confidence: 99%

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Rusby

Gray

Butler

et al. 2018

EPJ Web of Conferences

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Abstract. The interaction of a high-intensity laser with a solid target produces an energetic distribution of electrons that pass into the target. These electrons reach the rear surface of the target creating strong electric potentials that act to restrict the further escape of additional electrons. The measurement of the angle, flux and spectra of the electrons that do escape gives insights to the initial interaction. Here, the escaping electrons have been measured using a differentially filtered image plate stack, from interactions with intensities from mid 10 20 -10 17 W/cm 2 , where the intensity has been reduced by defocussing to increase the size of the focal spot. An increase in electron flux is initially observed as the intensity is reduced from 4x10 20 to 6x10 18 W/cm 2 . The temperature of the electron distribution is also measured and found to be relatively constant. 2D particle-in-cell modelling is used to demonstrate the importance of pre-plasma conditions in understanding these observations.

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“…However, the pulse profile at PHELIX (see Ref. [4] for instance) exhibits a slow rise time from the ASE background to a few orders of magnitude below the laser peak intensity, over about 100 ps. The origin of the slow rise time is still not known with certainty although studies in other high-energy CPA lasers systems might indicate that this temporal semi-coherent noise originates from the stretcher [19] .…”

Section: Pulse Stiffening By Means Of Plasma Mirrorsmentioning

confidence: 99%

Ultrahigh temporal contrast performance of the PHELIX petawatt facility

Bagnoud

Wagner

2016

High Pow Laser Sci Eng

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We report on the temporal contrast performance of the PHELIX facility in view of the requirements imposed by solidtarget interaction experiments. The requirement analysis for the nanosecond and picosecond temporal contrast is derived from empirical data and simple theoretical modeling, while the realization shows that using an ultrafast optical parametric amplifier and plasma mirrors enables meeting this specification.

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Temporal contrast control at the PHELIX petawatt laser facility by means of tunable sub-picosecond optical parametric amplification

Cited by 55 publications

References 16 publications

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

Electron acceleration at grazing incidence of a subpicosecond intense laser pulse onto a plane solid target

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Ultrahigh temporal contrast performance of the PHELIX petawatt facility

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