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Synchronized off-harmonic probe laser with highly variable pulse duration for laser-plasma interaction experiments
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作者 j.hornung Y.Zobus +3 位作者 H.Lorenté C.Brabetz B.Zielbauer V.Bagnoud 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2024年第1期99-107,共9页
This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel... This paper presents the development and experimental utilization of a synchronized off-harmonic laser system designed as a probe for ultra-intense laser±plasma interaction experiments. The system exhibits a novel seed-generation design,allowing for a variable pulse duration spanning over more than three orders of magnitude, from 3.45 picoseconds to 10 nanoseconds. This makes it suitable for various plasma diagnostics and visualization techniques. In a side-view configuration, the laser was employed for interferometry and streaked shadowgraphy of a laser-induced plasma while successfully suppressing the self-emission background of the laser±plasma interaction, resulting in a signal-to-self-emission ratio of 110 for this setup. These properties enable the probe to yield valuable insights into the plasma dynamics and interactions at the PHELIX facility and to be deployed at various laser facilities due to its easy-to-implement design. 展开更多
关键词 INTERFEROMETRY laser-plasma interaction off-harmonic probe laser streaked shadowgraphy
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Ultra-compact post-compressor on-shot wavefront measurement for beam correction at PHELIX 被引量:4
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作者 J.B.Ohland U.Eisenbarth +5 位作者 B.Zielbauer Y.Zobus D.Posor j.hornung D.Reemts V.Bagnoud 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2022年第3期2-10,共9页
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-t... 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. 展开更多
关键词 adaptive optics beam quality high intensity laser diagnostics on shot Strehl WAVEFRONT
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Implementation of a phase plate for the generation of homogeneous focal-spot intensity distributions at the high-energy short-pulse laser facility PHELIX 被引量:2
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作者 V.Bagnoud j.hornung +4 位作者 M.Afshari U.Eisenbarth C.Brabetz Z.Major B.Zielbauer 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2019年第4期33-38,共6页
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 las... 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. 展开更多
关键词 beam shaping high-power laser phase plate short-pulse laser
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Enhancement of the laser-driven proton source at PHELIX 被引量:1
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作者 j.hornung Y.Zobus +8 位作者 P.Boller C.Brabetz U.Eisenbarth T.Kühl Zs.Major J.B.Ohl M.Zepf B.Zielbauer V.Bagnoud 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2020年第2期153-160,共8页
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 P... 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. 展开更多
关键词 high power laser proton acceleration secondary sources
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