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Goyon C, Edwards MR, Chapman T, Divol L, Lemos N, Williams GJ, Mariscal DA, Turnbull D, Hansen AM, Michel P. Slow and Fast Light in Plasma Using Optical Wave Mixing. PHYSICAL REVIEW LETTERS 2021; 126:205001. [PMID: 34110194 DOI: 10.1103/physrevlett.126.205001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/10/2021] [Accepted: 04/13/2021] [Indexed: 06/12/2023]
Abstract
Slow and fast light, or large changes in the group velocity of light, have been observed in a range of optical media, but the fine optical control necessary to induce an observable effect has not been achieved in a plasma. Here, we describe how the ion-acoustic response in a fully ionized plasma can produce large and measurable changes in the group velocity of light. We show the first experimental demonstration of slow and fast light in a plasma, measuring group velocities between 0.12c and -0.34c.
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Affiliation(s)
- C Goyon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M R Edwards
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Chapman
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L Divol
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - N Lemos
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G J Williams
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Turnbull
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
| | - A M Hansen
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
| | - P Michel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Davies AS, Haberberger D, Katz J, Bucht S, Palastro JP, Rozmus W, Froula DH. Picosecond Thermodynamics in Underdense Plasmas Measured with Thomson Scattering. PHYSICAL REVIEW LETTERS 2019; 122:155001. [PMID: 31050505 DOI: 10.1103/physrevlett.122.155001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 01/14/2019] [Indexed: 06/09/2023]
Abstract
The rapid evolutions of the electron density and temperature in a laser-produced plasma were measured using collective Thomson scattering. Unprecedented picosecond time resolution, enabled by a pulse-front-tilt compensated spectrometer, revealed a transition in the plasma-wave dynamics from an initially cold, collisional state to a quasistationary, collisionless state. The Thomson-scattering spectra were compared with theoretical calculations of the fluctuation spectrum using either a conventional Bhatnagar-Gross-Krook (BGK) collision operator or the rigorous Landau collision terms: the BGK model overestimates the electron temperature by 50% in the most-collisional conditions.
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Affiliation(s)
- A S Davies
- Laboratory for Laser Energetics, University of Rochester, 250 E River Road, Rochester, New York 14623, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA
| | - D Haberberger
- Laboratory for Laser Energetics, University of Rochester, 250 E River Road, Rochester, New York 14623, USA
| | - J Katz
- Laboratory for Laser Energetics, University of Rochester, 250 E River Road, Rochester, New York 14623, USA
| | - S Bucht
- Laboratory for Laser Energetics, University of Rochester, 250 E River Road, Rochester, New York 14623, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA
| | - J P Palastro
- Laboratory for Laser Energetics, University of Rochester, 250 E River Road, Rochester, New York 14623, USA
| | - W Rozmus
- Theoretical Physics Institute, Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E1
- High Energy Density Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - D H Froula
- Laboratory for Laser Energetics, University of Rochester, 250 E River Road, Rochester, New York 14623, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA
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Froula DH, Ross JS, Pollock BB, Davis P, James AN, Divol L, Edwards MJ, Offenberger AA, Price D, Town RPJ, Tynan GR, Glenzer SH. Quenching of the nonlocal electron heat transport by large external magnetic fields in a laser-produced plasma measured with imaging thomson scattering. PHYSICAL REVIEW LETTERS 2007; 98:135001. [PMID: 17501207 DOI: 10.1103/physrevlett.98.135001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2006] [Indexed: 05/15/2023]
Abstract
We present a direct measurement of the quenching of nonlocal heat transport in a laser-produced plasma by applying large external magnetic fields (>10 T). The temporally resolved Thomson-scattering measurements of the electron temperature profile show that the heat front propagation transverse to a high-power laser beam is slowed resulting in extremely strong local heating. We find agreement with hydrodynamic modeling when including a magnetic field model that self-consistently evolves the fields in the plasma.
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Affiliation(s)
- D H Froula
- L-399, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551, USA.
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Rousseaux C, Gremillet L, Casanova M, Loiseau P, Rabec Le Gloahec M, Baton SD, Amiranoff F, Adam JC, Héron A. Transient development of backward stimulated Raman and Brillouin scattering on a picosecond time scale measured by subpicosecond thomson diagnostic. PHYSICAL REVIEW LETTERS 2006; 97:015001. [PMID: 16907380 DOI: 10.1103/physrevlett.97.015001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2005] [Indexed: 05/11/2023]
Abstract
The excitation and the relaxation of the plasma waves and ion acoustic waves (IAW), respectively, driven by stimulated Raman (SRS) and Brillouin (SBS) backscatterings have been experimentally investigated with short-pulse lasers. The spectra have been obtained with a 0.3 ps time resolution. It is shown that SRS develops before SBS and suddenly decays around the peak of the pump, as the IAW reaches saturation. On this short time scale, electron kinetic effects play a major role for SRS saturation, contrary to ion dynamics. These results are supported by particle-in-cell simulations.
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Affiliation(s)
- C Rousseaux
- Commissariat à l'Energie Atomique, Direction d'Ile de France, 91680 Bruyères-le-Châtel, France
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