Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces

B. Dromey, S. Kar, C. Bellei, D.C. Carroll, R.J. Clarke, J.S. Green, S. Kneip, K. Markey, P. McKenna

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

The first evidence of x-ray harmonic radiation extending to 3.3 A, 3.8 keV (order n > 3200) from petawatt class laser-solid interactions is presented, exhibiting relativistic limit efficiency scaling (eta similar to n(-2.5)-n(-3)) at multi-keV energies. This scaling holds up to a maximum order, n(RO)similar to 8(1/2)gamma(3), where gamma is the relativistic Lorentz factor, above which the first evidence of an intensity dependent efficiency rollover is observed. The coherent nature of the generated harmonics is demonstrated by the highly directional beamed emission, which for photon energy h nu > 1 keV is found to be into a cone angle similar to 4 degrees, significantly less than that of the incident laser cone (20 degrees).

LanguageEnglish
Pages085001
Number of pages4
JournalPhysical Review Letters
Volume99
Issue number8
DOIs
Publication statusPublished - 24 Aug 2007

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harmonic generations
cones
scaling
harmonic radiation
lasers
harmonics
energy
photons
x rays
interactions

Keywords

  • intense laser
  • solid targets
  • pulse
  • reflection

Cite this

Dromey, B. ; Kar, S. ; Bellei, C. ; Carroll, D.C. ; Clarke, R.J. ; Green, J.S. ; Kneip, S. ; Markey, K. ; McKenna, P. / Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces. In: Physical Review Letters. 2007 ; Vol. 99, No. 8. pp. 085001.
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abstract = "The first evidence of x-ray harmonic radiation extending to 3.3 A, 3.8 keV (order n > 3200) from petawatt class laser-solid interactions is presented, exhibiting relativistic limit efficiency scaling (eta similar to n(-2.5)-n(-3)) at multi-keV energies. This scaling holds up to a maximum order, n(RO)similar to 8(1/2)gamma(3), where gamma is the relativistic Lorentz factor, above which the first evidence of an intensity dependent efficiency rollover is observed. The coherent nature of the generated harmonics is demonstrated by the highly directional beamed emission, which for photon energy h nu > 1 keV is found to be into a cone angle similar to 4 degrees, significantly less than that of the incident laser cone (20 degrees).",
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Dromey, B, Kar, S, Bellei, C, Carroll, DC, Clarke, RJ, Green, JS, Kneip, S, Markey, K & McKenna, P 2007, 'Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces' Physical Review Letters, vol. 99, no. 8, pp. 085001. https://doi.org/10.1103/PhysRevLett.99.085001

Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces. / Dromey, B.; Kar, S.; Bellei, C.; Carroll, D.C.; Clarke, R.J.; Green, J.S.; Kneip, S.; Markey, K.; McKenna, P.

In: Physical Review Letters, Vol. 99, No. 8, 24.08.2007, p. 085001.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces

AU - Dromey, B.

AU - Kar, S.

AU - Bellei, C.

AU - Carroll, D.C.

AU - Clarke, R.J.

AU - Green, J.S.

AU - Kneip, S.

AU - Markey, K.

AU - McKenna, P.

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N2 - The first evidence of x-ray harmonic radiation extending to 3.3 A, 3.8 keV (order n > 3200) from petawatt class laser-solid interactions is presented, exhibiting relativistic limit efficiency scaling (eta similar to n(-2.5)-n(-3)) at multi-keV energies. This scaling holds up to a maximum order, n(RO)similar to 8(1/2)gamma(3), where gamma is the relativistic Lorentz factor, above which the first evidence of an intensity dependent efficiency rollover is observed. The coherent nature of the generated harmonics is demonstrated by the highly directional beamed emission, which for photon energy h nu > 1 keV is found to be into a cone angle similar to 4 degrees, significantly less than that of the incident laser cone (20 degrees).

AB - The first evidence of x-ray harmonic radiation extending to 3.3 A, 3.8 keV (order n > 3200) from petawatt class laser-solid interactions is presented, exhibiting relativistic limit efficiency scaling (eta similar to n(-2.5)-n(-3)) at multi-keV energies. This scaling holds up to a maximum order, n(RO)similar to 8(1/2)gamma(3), where gamma is the relativistic Lorentz factor, above which the first evidence of an intensity dependent efficiency rollover is observed. The coherent nature of the generated harmonics is demonstrated by the highly directional beamed emission, which for photon energy h nu > 1 keV is found to be into a cone angle similar to 4 degrees, significantly less than that of the incident laser cone (20 degrees).

KW - intense laser

KW - solid targets

KW - pulse

KW - reflection

U2 - 10.1103/PhysRevLett.99.085001

DO - 10.1103/PhysRevLett.99.085001

M3 - Article

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SP - 085001

JO - Physical Review Letters

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