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Sarri G, Cecchetti CA, Jung R, Hobbs P, James S, Lockyear J, Stevenson RM, Doria D, Hoarty DJ, Willi O, Borghesi M. Spatially resolved measurements of laser filamentation in long scale length underdense plasmas with and without beam smoothing. PHYSICAL REVIEW LETTERS 2011; 106:095001. [PMID: 21405630 DOI: 10.1103/physrevlett.106.095001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Indexed: 05/30/2023]
Abstract
The onset of filamentation, following the interaction of a relatively long (τ(L)≃1 ns) and intense (I(L)≃5×10(14) W/cm(2)) laser pulse with a neopentane filled gas bag target, has been experimentally studied via the proton radiography technique, in conditions of direct relevance to the indirect drive inertial confinement fusion scheme. The density gradients associated with filamentation onset have been spatially resolved yielding direct and unambiguous evidence of filament formation and quantitative information about the filamentation mechanism in agreement with previous theoretical modelings. Experimental data confirm that, once spatially smoothed laser beams are used, filamentation is not a relevant phenomenon during the heating laser beams propagation through typical hohlraum gas fills.
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Affiliation(s)
- G Sarri
- School of Mathematics and Physics, The Queen's University of Belfast, United Kingdom
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2
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Sharma A, Kourakis I, Shukla PK. Spatiotemporal evolution of high-power relativistic laser pulses in electron-positron-ion plasmas. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2010; 82:016402. [PMID: 20866742 DOI: 10.1103/physreve.82.016402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Indexed: 05/29/2023]
Abstract
The spatiotemporal pulse dynamics of a high-power relativistic laser pulse interacting with an electron-positron-ion plasmas is investigated theoretically and numerically. The occurrence of pulse compression is studied. The dependence of the mechanism on the concentration of the background ions in electron positron plasma is emphasized.
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Affiliation(s)
- A Sharma
- Centre for Plasma Physics, School of Mathematics & Physics, Queen's University Belfast, Belfast, United Kingdom
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Filevich J, Rocca JJ, Jankowska E, Hammarsten EC, Kanizay K, Marconi MC, Moon SJ, Shlyaptsev VN. Two-dimensional effects in laser-created plasmas measured with soft-x-ray laser interferometry. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 67:056409. [PMID: 12786289 DOI: 10.1103/physreve.67.056409] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2002] [Indexed: 05/24/2023]
Abstract
Soft-x-ray laser interferograms of laser-created plasmas generated at moderate irradiation intensities (1 x 10(11)-7 x 10(12) W cm(-2)) with lambda=1.06 microm light pulses of approximately 13-ns-FWHM (full width at half maximum) duration and narrow focus (approximately 30 microm) reveal the unexpected formation of an inverted density profile with a density minimum on axis and distinct plasma sidelobes. Model simulations show that this strong two-dimensional hydrodynamic behavior is essentially a universal phenomena that is the result of plasma radiation induced mass ablation and cooling in the areas surrounding the focal spot.
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Affiliation(s)
- J Filevich
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523, USA
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4
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Labaune C, Baldis HA, Schifano E, Bauer BS, Maximov A, Ourdev I, Rozmus W, Pesme D. Enhanced forward scattering in the case of two crossed laser beams interacting with a plasma. PHYSICAL REVIEW LETTERS 2000; 85:1658-1661. [PMID: 10970582 DOI: 10.1103/physrevlett.85.1658] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/1999] [Indexed: 05/23/2023]
Abstract
The nonlinear enhancement of large-angle forward scattering of two identical laser beams propagating in a preformed plasma has been observed experimentally. The spectral analysis of the forward-scattered light shows two components, one which is unshifted with respect to the initial laser light frequency, and the other which is redshifted by a few angstroms. The redshifted component is found to be strongly enhanced in the case of crossed beam interaction in comparison with that of one beam illumination. Two-dimensional numerical simulations show that this enhancement is due to large-angle forward stimulated Brillouin scattering in which each beam serves as seed for the forward scattering of the other.
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Affiliation(s)
- C Labaune
- Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
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Takahashi K, Kodama R, Tanaka KA, Hashimoto H, Kato Y, Mima K, Weber FA, Barbee TW. Laser-hole boring into overdense plasmas measured with soft X-Ray laser probing. PHYSICAL REVIEW LETTERS 2000; 84:2405-2408. [PMID: 11018896 DOI: 10.1103/physrevlett.84.2405] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/1999] [Indexed: 05/23/2023]
Abstract
A laser self-focused channel formation into overdense plasmas was observed using a soft x-ray laser probe system with a grid image refractometry (GIR) technique. 1.053 &mgr;m laser light with a 100 ps pulse duration was focused onto a preformed plasma at an intensity of 2x10(17) W/cm (2). Cross sections of the channel were obtained which show a 30 &mgr;m diameter in overdense plasmas. The channel width in the overdense region was kept narrow as a result of self-focusing. Conically diverging density ridges were also observed along the channel, indicating a Mach cone created by a shock wave due to the supersonic propagation of the channel front.
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Affiliation(s)
- K Takahashi
- Institute of Laser Engineering, Osaka University, Yamada Oka 2-6, Suita, Osaka 565-0871, Japan
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6
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Tanaka KA, Hashimoto H, Kodama R, Mima K, Sentoku Y, Takahashi K. Performance comparison of self-focusing with 1053- and 351-nm laser pulses. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1999; 60:3283-8. [PMID: 11970141 DOI: 10.1103/physreve.60.3283] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/1999] [Indexed: 04/18/2023]
Abstract
Hole boring characteristics of laser beams are studied using two different laser wavelengths in preformed plasmas with overdense regions. We have shown that a whole beam self-focusing is created in plasma with a considerable density scale length using a 1 microm wavelength laser. The whole beam self-focusing of this type could be used for guiding the ultrahigh intense laser pulse to a highly compressed core for studying the feasibility of a fast ignitor. There is a clear difference in the hole-boring characteristics between two laser wavelengths at 1053 and 351 nm, both in the experiment and the simulation. Using the third-harmonic laser, a whole beam self-focusing is never created. The 351-nm laser beam broke up into filaments resulting in plasma jets observed in our interferogram.
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Affiliation(s)
- K A Tanaka
- Institute of Laser Engineering, Osaka University Yamada-Oka 2-6, Suita, Osaka 565 Japan.
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7
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Kodama R, Takahashi K, Tanaka KA, Tsukamoto M, Hashimoto H, Kato Y, Mima K. Study of Laser-Hole Boring into Overdense Plasmas. PHYSICAL REVIEW LETTERS 1996; 77:4906-4909. [PMID: 10062665 DOI: 10.1103/physrevlett.77.4906] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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8
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Young PE, Bolton PR. Propagation of Subpicosecond Laser Pulses through a Fully Ionized Plasma. PHYSICAL REVIEW LETTERS 1996; 77:4556-4559. [PMID: 10062568 DOI: 10.1103/physrevlett.77.4556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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9
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Vidal F, Johnston TW. Electromagnetic Beam Breakup: Multiple Filaments, Single Beam Equilibria, and Radiation. PHYSICAL REVIEW LETTERS 1996; 77:1282-1285. [PMID: 10063037 DOI: 10.1103/physrevlett.77.1282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Young PE, Guethlein G, Wilks SC, Hammer JH, Kruer WL, Estabrook KG. Fast ion production by laser filamentation in laser-produced plasmas. PHYSICAL REVIEW LETTERS 1996; 76:3128-3131. [PMID: 10060882 DOI: 10.1103/physrevlett.76.3128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Young PE, Foord ME, Hammer JH, Kruer WL, Tabak M, Wilks SC. Time-dependent channel formation in a laser-produced plasma. PHYSICAL REVIEW LETTERS 1995; 75:1082-1085. [PMID: 10060201 DOI: 10.1103/physrevlett.75.1082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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12
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Barbee TW, Cauble R, Celliers P, Ciarlo D, Libby S, London RA, Matthews D, Mrowka S, Moreno JC, Ress D, Trebes JE, Wan AS, Weber F. Electron Density Measurements of High Density Plasmas Using Soft X-Ray Laser Interferometry. PHYSICAL REVIEW LETTERS 1995; 74:3991-3994. [PMID: 10058385 DOI: 10.1103/physrevlett.74.3991] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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