X-ray spectroscopy of super-intense laser-produced plasmas for the study of nonlinear processes. Comparison with PIC simulations

[摘要] We present X-ray spectroscopic diagnostics in femto-second laser-driven experiments revealing nonlinear phenomena caused by the strong coupling of the laser radiation with the created plasma. Among those nonlinear phenomena, we found the signatures of the Two Plasmon Decay (TPD) instability in a laser-driven CO2cluster-based plasma by analyzing the Langmuir dips in the profile of the O VIII Ly line, caused by the Langmuir waves created at the high laser intensity 3 1018Wcm-2. With similar laser intensities, we reveal also the nonlinear phenomenon of the Second Harmonic Generation (SHG) of the laser frequency by analyzing the nonlinear phenomenon of satellites of Lyman δ andlines of Ar XVII. In the case of relativistic laser-plasma interaction we discovered the Parametric Decay Instability (PDI)-induced ion acoustic turbulence produced simultaneously with Langmuir waves via irradiation of thin Si foils by laser intensities of 1021Wcm-2.

[发布机构] LULI - UPMC Paris 06, Sorbonne Universités;, CNRS, Ecole Polytechnique, CEA : Université Paris-Saclay, Paris Cedex 05; F-75252, France^1;Institute for Academic Initiatives, Osaka University, Suita, Osaka; 565-0871, Japan^2;Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow; 125412, Russia^3;Physics Department, 206 Allison Lab, Auburn University, Auburn; AL; 36849, United States^4;PPC, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Osaka, Suita; 565-0871, Japan^5;Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, Kizugawa; 619-0215, Japan^6;Max Born Institute, Max-Born Str.2a, Berlin; 12489, Germany^7;ELI-ALPS, Szeged; H-6720, Hungary^8;National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Moscow; 115409, Russia; (10) York Plasma Institute, Department of Physics, University of York, York; YO10 5DD, United Kingdom; (11) Department of Physics, SUPA, University of Strathclyde, Glasgow; G4 0NG, United Kingdom; (12) Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot; OX11 0QX, United Kingdom^9

[关键词] Femto-second laser;High laser intensities;Ion acoustic turbulences;Laser intensities;Non-linear phenomena;Parametric decay instability;Relativistic laser plasma;Spectroscopic diagnostics