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Proceedings Paper

Coherent x-ray generation in relativistic laser/gas jet interactions
Author(s): A. S. Pirozhkov; M. Kando; T. Zh. Esirkepov; P. Gallegos; H. Ahmed; E. N. Ragozin; A. Ya. Faenov; T. A. Pikuz; J. K. Koga; H. Kiriyama; P. McKenna; M. Borghesi; K. Kondo; H. Daido; Y. Kato; D. Neely; S. V. Bulanov
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Paper Abstract

We present experimental results, theory, and simulations demonstrating two novel sources of coherent X-ray radiation generated in the relativistic laser (>1018W/cm2) interaction with easily accessible, repetitive, and debris-free gas jet targets. The first source is based on a relativistic mirror reflecting a counter-propagating laser pulse. A strongly nonlinear breaking wake wave driven by an intense laser pulse can act as a semi-transparent relativistic flying mirror. Such a mirror directly converts counter-propagating laser light into a high-frequency (XUV or X-ray) ultrashort pulse due to the double Doppler effect. In the experimental demonstration with the 9 TW J-KAREN laser, the flying mirror generated in a He gas jet partially reflected a 1 TW pulse, providing up to ~1010 photons, 60 nJ (~1012 photons/sr) in the XUV range (12.8-22 nm). The second source is demonstrated with the laser power ranging from 9 to 170 TW in experiments with the J-KAREN and Astra Gemini lasers. The odd and even order harmonics generated by linearly as well as circularly polarized pulses are emitted forward out of the gas jet. The 120 TW laser pulses produce harmonics with ~3×1013photons/sr (~600 μJ/sr) in the 120±5 eV spectral range. The observed harmonics cannot be explained by previously known mechanisms (atomic harmonics, betatron radiation, nonlinear Thomson scattering, etc.). We introduce a novel mechanism of harmonic generation based on the relativistic laser-plasma phenomena (self-focusing, cavity evacuation, bow wave generation), mathematical catastrophe theory which explains the formation of structurally stable electron density singularities, spikes, and collective radiation of a compact charge driven by a relativistic laser.

Paper Details

Date Published: 5 October 2011
PDF: 16 pages
Proc. SPIE 8140, X-ray Lasers and Coherent X-ray Sources: Development and Applications IX, 81400A (5 October 2011); doi: 10.1117/12.892898
Show Author Affiliations
A. S. Pirozhkov, Japan Atomic Energy Agency (Japan)
M. Kando, Japan Atomic Energy Agency (Japan)
T. Zh. Esirkepov, Japan Atomic Energy Agency (Japan)
P. Gallegos, Rutherford Appleton Lab. (United Kingdom)
Univ. of Strathclyde (United Kingdom)
H. Ahmed, Queen's Univ. Belfast (United Kingdom)
E. N. Ragozin, P.N. Lebedev Physical Institute (Russian Federation)
Moscow Institute of Physics and Technology (State Univ.) (Russian Federation)
A. Ya. Faenov, Japan Atomic Energy Agency (Japan)
Joint Institute for High Temperatures (Russian Federation)
T. A. Pikuz, Japan Atomic Energy Agency (Japan)
Joint Institute for High Temperatures (Russian Federation)
J. K. Koga, Japan Atomic Energy Agency (Japan)
H. Kiriyama, Japan Atomic Energy Agency (Japan)
P. McKenna, Univ. of Strathclyde (United Kingdom)
M. Borghesi, Queen's Univ. Belfast (United Kingdom)
K. Kondo, Japan Atomic Energy Agency (Japan)
H. Daido, Japan Atomic Energy Agency (Japan)
Y. Kato, The Graduate School for the Creation of New Photonics Industries (Japan)
D. Neely, Rutherford Appleton Lab. (United Kingdom)
Univ. of Strathclyde (United Kingdom)
S. V. Bulanov, Japan Atomic Energy Agency (Japan)
Moscow Institute of Physics and Technology (State Univ.) (Russian Federation)
A. M. Prokhorov Institute of General Physics (Russian Federation)


Published in SPIE Proceedings Vol. 8140:
X-ray Lasers and Coherent X-ray Sources: Development and Applications IX
James Dunn; Annie Klisnick, Editor(s)

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