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Optical probing of ultrafast laser-induced solid-to-overdense-plasma transitions

Light(Science & Applications) 2024年第5期13卷 973-984页

作者： Yasmina Azamoum Georg Alexander Becker Sebastian Keppler Guillaume Duchateau Stefan Skupin Mickael Grech Fabrice Catoire Sebastian Hell Issa Tamer Marco Hornung Marco Hellwing Alexander Kessler Franck Schorcht malte chris.oph kaluza GSI Helmholtzzentrum für Schwerionenforschung Planckstr.164291 DarmstadtGermany. Helmholtz Institute Jena Fröbelstieg 307743 JenaGermany. Institute of Optics and Quantum Electronics Friedrich-SchillerUniversität JenaMax-Wien-Platz 107743 JenaGermany. CEA-CESTA 15 Avenue des SablièresCS6000133116 Le BarpCedexFrance Institut Lumière Matière UMR 5306-CNRSUniversitéde Lyon 169622 VilleurbanneFrance. LULI CNRSCEASorbonne UniversitéInstitut Polytechnique de ParisPalaiseauFrance. Universitéde Bordeaux-CNRS-CEA CELIAUMR 5107 TalenceFrance

Understanding the solid target dynamics resulting from the interaction with an ultrashort laser pulse is a challenging fundamental multi-physics problem involving atomic and solid-state physics,plasma physics,and laser *** of the initial interplay of the underlying processes is essential to many applications ranging from lowpower laser regimes like laser-induced ablation to high-power laser regimes like laser-driven ion *** the properties of the so-called pre-plasma formed as the laser pulse’s rising edge ionizes the target is complicated from the theoretical and experimental point of view,and many aspects of this laser-induced transition from solid to overdense plasma over picosecond timescales are still open *** the one hand,laser-driven ion acceleration requires precise control of the pre-plasma because the efficiency of the acceleration process crucially depends on the target properties at the arrival of the relativistic intensity peak of the *** the other hand,efficient laser ablation requires,for example,preventing the so-called“plasma shielding”.By capturing the dynamics of the initial stage of the interaction,we report on a detailed visualization of the pre-plasma formation and ***-thin diamond-like carbon foils are shown to transition from solid to plasma during the laser rising edge with intensities<10^(16)W/cm^(2).Single-shot near-infrared probe transmission measurements evidence sub-picosecond dynamics of an expanding plasma with densities above 10^(23)cm^(−3)(about 100 times the critical plasma density).The complementarity of a solid-state interaction model and kinetic plasma description provides deep insight into the interplay of initial ionization,collisions,and expansion.

关键词： laser acceleration solid

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Unveiling the inner structure of electron pulses generated from a laser-wakefield accelerator

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Light(Science & Applications) 2023年第10期12卷 1992-1994页

作者： malte C.kaluza Institute of Optics and Quantum Electronics Max-Wien-Platz 107743JenaGermany Helmholtz-Institute Jena Fröbelstieg 307743JenaGermany

A novel diagnostic method has been used to gain deeper insight into the transverse structure and its evolution of electron pulses generated from a laser-wakefield accelerator.

关键词： structure field laser

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Modeling of the 3D spatio-temporal thermal profile of joule-class Yb3+-based laser amplifiers

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High Power Laser Science and Engineering 2019年第3期7卷 53-59页

作者： Issa Tamer Sebastian Keppler Jorg Komer Marco Hornung Marco Hellwing Frank Schorcht Joachim Hein malte C.kaluza Helmholtz-Institute Jena Frobelstieg 307743 JenaGermany Friedrich-Schiller-University Jena Max-Wien Platz 107743 JenaGermany

Thermal profile modification of an active material in a laser amplifier via optical pumping results in a change in the material’s refractive index,and causes thermal expansion and stress,eventually leading to spatial phase aberrations,or even permanent material *** this purpose,knowledge of the 3D spatio-temporal thermal profile,which can currently only be retrieved via numerical simulations,is critical for joule-class laser amplifiers to reveal potentially dangerous thermal features within the pumped active *** this investigation,a detailed,spatio-temporal numerical simulation was constructed and tested for accuracy against surface thermal measurements of various endpumped Yb^3+-doped laser-active *** measurements and simulations show an excellent agreement and the model was successfully applied to a joule-class Yb3+-based amplifier currently operating in the POLARIS laser system at the Friedrich-Schiller-University and Helmholtz-Institute Jena in Germany.

关键词： diode-pumped solid-state lasers high intensity lasers laser amplifiers spatio-temporal thermal profile modeling ytterbium

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The all-diode-pumped laser system POLARIS——an experimentalist's tool generating ultra-high contrast pulses with high energy

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High Power Laser Science and Engineering 2014年第3期2卷 5-11页

作者： Marco Hornung Hartmut Liebetrau Andreas Seidel Sebastian Keppler Alexander Kessler Jrg Krner Marco Hellwing Frank Schorcht Diethard Klpfel Ajay K.Arunachalam Georg A.Becker Alexander Svert Jens Polz Joachim Hein malte C.kaluza Helmholtz-Institute Jena Germany Institute of Optics and Quantum Electronics JenaGermany

The development,the underlying technology and the current status of the fully diode-pumped solid-state laser system POLARIS is ***,the POLARIS system delivers 4 J energy,144 fs long laser pulses with an ultra-high temporal contrast of 5 × 1012 for the ASE,which is achieved using a so-called double chirped-pulse amplification scheme and cross-polarized wave generation pulse *** tightly focusing,the peak intensity exceeds 3.5 × 1020 W *** parameters predestine POLARIS as a scientific tool well suited for sophisticated experiments,as exemplified by presenting measurements of accelerated proton ***,an additional amplifier has been added to the laser *** the ramp-up phase,pulses from this amplifier are not yet compressed and have not yet reached the anticipated ***,an output energy of 16.6 J has been achieved so far.

关键词： design high power laser laser amplifiers laser plasmas interaction laser systems modelling optimization ultra-intense ultrashort pulse laser interaction with matter

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Diode-pumped, electro-optically Q-switched, cryogenic Tm:YAG laser operating at 1.88 μm

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High Power Laser Science and Engineering 2021年第1期9卷 107-112页

作者： J?rg K?rner Venkatesan Jambunathan Fangxin Yue Jürgen Reiter Ondrej Slezák Petr Navrátil Samuel Paul David Antonio Lucianetti Joachim Hein Tomá? Mocek malte C.kaluza HiLASE Centre Institute of Physics of the Czech Academy of Sciences Institute of Optics and Quantum Electronics Friedrich Schiller University Jena Helmholz Institute Jena Hi LASE Centre Institute of Physics of the Czech Academy of Sciences

We present a diode-pumped, electro-optically Q-switched Tm:YAG laser with a cryogenically cooled laser crystal at120 K. Output pulses of up to 2.55 mJ and 650 ns duration were demonstrated in an actively Q-switched configuration with a repetition rate of 1 Hz. By using cavity dumping the pulse duration was shortened to 18 ns with only a slightly lower output energy of 2.22 mJ. Furthermore, using a simplified rate equation model, we discuss design constraints on the pump fluence in a pulse pump approach for Tm:YAG to maximize the energy storage capability at a given pump power.

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