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| 1 | Implementation of a phase plate for the generation of homogeneous focal-spot intensity distributions at the high-energy short-pulse laser facility PHELIX显示文摘We propose and demonstrate the use of random phase plates(RPPs)for high-energy sub-picosecond lasers.Contrarily to previous work related to nanosecond lasers,an RPP poses technical challenges with ultrashort-pulse lasers.Here,we implement the RPP near the beginning of the amplifier and image-relay it throughout the laser amplifier.With this,we obtain a uniform intensity distribution in the focus over an area 1600 times the diffraction limit.This method shows no significant drawbacks for the laser and it has been implemented at the PHELIX laser facility where it is now available for users. | V.Bagnoud J.Hornung M.Afshari U.Eisenbarth C.Brabetz Z.Major B.Zielbauer | 2019 | High Power Laser Science and Engineering2019，7，4： | 1 |
| 2 | Ultra-compact post-compressor on-shot wavefront measurement for beam correction at PHELIX显示文摘In order to reach the highest intensities,modern laser systems use adaptive optics to control their beam quality.Ideally,the focal spot is optimized after the compression stage of the system in order to avoid spatio-temporal couplings.This also requires a wavefront sensor after the compressor,which should be able to measure the wavefront on-shot.At PHELIX,we have developed an ultra-compact post-compressor beam diagnostic due to strict space constraints,measuring the wavefront over the full aperture of 28 cm.This system features all-reflective imaging beam transport and a high dynamic range in order to measure the wavefront in alignment mode as well as on shot. | J.B.Ohland U.Eisenbarth B.Zielbauer Y.Zobus D.Posor J.Hornung D.Reemts V.Bagnoud | 2022 | High Power Laser Science and Engineering2022，10，3： | 0 |
| 3 | Accelerating ions with high-energy short laser pulses from submicrometer thick targets显示文摘Using the example of the PHELIX high-energy short pulse laser we discuss the technical preconditions to investigate ion acceleration with submicrometer thick targets. We show how the temporal contrast of this system was improved to prevent pre-ionization of such targets on the nanosecond timescale. Furthermore the influence of typical fluctuations or uncertainties of the on-target intensity on ion acceleration experiments is discussed. We report how these uncertainties were reduced by improving the assessment and control of the on-shot intensity and by optimizing the positioning of the target into the focal plane. Finally we report on experimental results showing maximum proton energies in excess of 85 MeV for ion acceleration via the target normal sheath acceleration mechanism using target thicknesses on the order of one micrometer. | F.Wagner C.Brabetz O.Deppert M.Roth T.Stohlker An.Tauschwitz A.Tebartz B.Zielbauer V.Bagnoud | 2016 | High Power Laser Science and Engineering2016，4，4： | 0 |
| 4 | Collisionless shock acceleration of protons in a plasma slab produced in a gas jet by the collision of two laser-driven hydrodynamic shockwaves显示文摘We have recently proposed a new technique of plasma tailoring by laser-driven hydrodynamic shockwaves generated on both sides of a gas jet[Marquès et al.,Phys.Plasmas 28,023103(2021)].In a continuation of this numerical work,we study experimentally the influence of the tailoring on proton acceleration driven by a high-intensity picosecond laser in three cases:without tailoring,by tailoring only the entrance side of the picosecond laser,and by tailoring both sides of the gas jet.Without tailoring,the acceleration is transverse to the laser axis,with a low-energy exponential spectrum,produced by Coulomb explosion.When the front side of the gas jet is tailored,a forward acceleration appears,which is significantly enhanced when both the front and back sides of the plasma are tailored.This forward acceleration produces higher-energy protons,with a peaked spectrum,and is in good agreement with the mechanism of collisionless shock acceleration(CSA).The spatiotemporal evolution of the plasma profile is characterized by optical shadowgraphy of a probe beam.The refraction and absorption of this beam are simulated by post-processing 3D hydrodynamic simulations of the plasma tailoring.Comparison with the experimental results allows estimation of the thickness and near-critical density of the plasma slab produced by tailoring both sides of the gas jet.These parameters are in good agreement with those required for CSA. | J.-R.Marquès L.Lancia P.Loiseau P.Forestier-Colleoni M.Tarisien E.Atukpor V.Bagnoud C.Brabetz F.Consoli J.Domange F.Hannachi P.Nicolaï M.Salvadori B.Zielbauer | 2024 | Matter and Radiation at Extremes2024，9，2： | 0 |
| 5 | Enhancement of the laser-driven proton source at PHELIX显示文摘We present a study of laser-driven ion acceleration with micrometre and sub-micrometre thick targets,which focuses on the enhancement of the maximum proton energy and the total number of accelerated particles at the PHELIX facility.Using laser pulses with a nanosecond temporal contrast of up to 10^-12 and an intensity of the order of 1020 W/cm^2,proton energies up to 93 MeV are achieved.Additionally,the conversion efficiency at 45°incidence angle was increased when changing the laser polarization to p,enabling similar proton energies and particle numbers as in the case of normal incidence and s-polarization,but reducing the debris on the last focusing optic. | J.Hornung Y.Zobus P.Boller C.Brabetz U.Eisenbarth T.Kühl Zs.Major J.B.Ohl M.Zepf B.Zielbauer V.Bagnoud | 2020 | High Power Laser Science and Engineering2020，8，2： | 0 |
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