Institution
Helmholtz Institute Jena
Facility•Jena, Germany•
About: Helmholtz Institute Jena is a facility organization based out in Jena, Germany. It is known for research contribution in the topics: Laser & Electron. The organization has 397 authors who have published 1074 publications receiving 17721 citations. The organization is also known as: HI Jena.
Topics: Laser, Electron, Ionization, Ion, Photon
Papers
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TL;DR: An overview of the state of the art in the field can be found in this paper, where the authors discuss present challenges and the future outlook of high-power fiber laser applications.
Abstract: High-power fibre lasers are in demand for industrial, defence and scientific applications. This review provides an overview of the present state of the art in the field and discusses present challenges and the future outlook.
781 citations
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TL;DR: In this article, the authors measured an energy loss in the postcollision electron spectrum that is correlated with the detected signal of hard photons (gamma rays), consistent with a quantum description of radiation reaction.
Abstract: The dynamics of energetic particles in strong electromagnetic fields can be heavily influenced by the energy loss arising from the emission of radiation during acceleration, known as radiation reaction. When interacting with a high-energy electron beam, today's lasers are sufficiently intense to explore the transition between the classical and quantum radiation reaction regimes. We present evidence of radiation reaction in the collision of an ultrarelativistic electron beam generated by laser-wakefield acceleration (epsilon > 500 MeV) with an intense laser pulse (a(0) > 10). We measure an energy loss in the postcollision electron spectrum that is correlated with the detected signal of hard photons (gamma rays), consistent with a quantum description of radiation reaction. The generated gamma rays have the highest energies yet reported from an all-optical inverse Compton scattering scheme, with critical energy epsilon(crit) > 30 MeV.
320 citations
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TL;DR: It is shown that, by using a compact laser-driven setup, ion-free electron–positron plasmas with unique characteristics can be produced, and their charge neutrality, high-density and small divergence finally open up the possibility of studying electron– Positron Plasmas in controlled laboratory experiments.
Abstract: Electron-positron pair plasmas represent a unique state of matter, whereby there exists an intrinsic and complete symmetry between negatively charged (matter) and positively charged (antimatter) particles. These plasmas play a fundamental role in the dynamics of ultra-massive astrophysical objects and are believed to be associated with the emission of ultra-bright gamma-ray bursts. Despite extensive theoretical modelling, our knowledge of this state of matter is still speculative, owing to the extreme difficulty in recreating neutral matter-antimatter plasmas in the laboratory. Here we show that, by using a compact laser-driven setup, ion-free electron-positron plasmas with unique characteristics can be produced. Their charge neutrality (same amount of matter and antimatter), high-density and small divergence finally open up the possibility of studying electron-positron plasmas in controlled laboratory experiments.
279 citations
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TL;DR: Limpert et al. as mentioned in this paper used a large-pitch photonic-crystal fiber doped with ytterbium to provide gain and achieved state-of-the-art performance.
Abstract: Rare earth-doped fibres are a diode-pumped, solid-state laser architecture that is highly scalable in average power. The performance of pulsed fibre laser systems is restricted due to nonlinear effects. Hence, fibre designs that allow for very large mode areas at high average powers with diffraction-limited beam quality are of enormous interest. Ytterbium-doped, rod-type, large-pitch fibres (LPF) enable extreme fibre dimensions, i.e., effective single-mode fibres with mode sizes exceeding 100 times the wavelength of the guided radiation, by exploiting the novel concept of delocalisation of higher-order transverse modes. The non-resonant nature of the operating principle makes LPF suitable for high power extraction. This design allows for an unparalleled level of performance in pulsed fibre lasers. A new design of optical fibre could allow fibre lasers to reach unprecedented output powers while maintaining excellent beam quality. The design, developed by Jens Limpert and co-workers from Friedrich-Schiller Universitat, Helmholtz Institute Jena and Fraunhofer Institute for Applied Optics and Precision Engineering in Jena, Germany, uses a large-pitch photonic-crystal fibre doped with ytterbium to provide gain. The key to the fibre's performance is the delocalisation of higher order modes due to the transversal arrangement of air-holes. The concept ensures that the fibre operates with a large fundamental mode that has a high-quality beam profile and good power handling characteristics, while suppressing unwanted higher order modes. A pulsed fibre laser based on this design emitted diffraction-limited pulses containing 26 mJ of energy with an average power of 130 W.
275 citations
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TL;DR: The spectral features provide evidence of a multispecies scenario of radiation pressure acceleration in the light sail mode and indicates that monoenergetic peaks with more than 100 MeV/nucleon are obtainable with moderate improvements of the target and laser characteristics, which are within reach of ongoing technical developments.
Abstract: The acceleration of ions from ultrathin foils has been investigated by using 250 TW, subpicosecond laser pulses, focused to intensities of up to 3 × 10(20) W cm(-2). The ion spectra show the appearance of narrow-band features for protons and carbon ions peaked at higher energies (in the 5-10 MeV/nucleon range) and with significantly higher flux than previously reported. The spectral features and their scaling with laser and target parameters provide evidence of a multispecies scenario of radiation pressure acceleration in the light sail mode, as confirmed by analytical estimates and 2D particle-in-cell simulations. The scaling indicates that monoenergetic peaks with more than 100 MeV/nucleon are obtainable with moderate improvements of the target and laser characteristics, which are within reach of ongoing technical developments.
270 citations
Authors
Showing all 401 results
Name | H-index | Papers | Citations |
---|---|---|---|
T. Kuhl | 101 | 761 | 40812 |
Andreas Tünnermann | 97 | 1738 | 43757 |
Jens Limpert | 78 | 955 | 21885 |
Matthew Zepf | 68 | 338 | 15237 |
Björn Jonson | 62 | 539 | 15630 |
Michael Wiescher | 60 | 580 | 15587 |
Thomas Nilsson | 58 | 466 | 10506 |
Holger Gies | 55 | 225 | 8937 |
Y. Zhang | 52 | 378 | 10784 |
Gerhard G. Paulus | 52 | 368 | 11514 |
Cesar Jauregui | 44 | 254 | 6277 |
Ingmar Hartl | 44 | 240 | 8165 |
Paul Indelicato | 44 | 414 | 9508 |
Malte C. Kaluza | 40 | 219 | 5552 |
Wilfried Nörtershäuser | 39 | 232 | 5031 |