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

doi:10.1103/PhysRevLett.99.085001

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 journal › Article › peer-review

215 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).

Original language	English
Pages (from-to)	085001
Number of pages	4
Journal	Physical Review Letters
Volume	99
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.99.085001
Publication status	Published - 24 Aug 2007

Keywords

intense laser
solid targets
pulse
reflection

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10.1103/PhysRevLett.99.085001

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title = "Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces",

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).",

keywords = "intense laser, solid targets, pulse, reflection",

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doi = "10.1103/PhysRevLett.99.085001",

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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.

PY - 2007/8/24

Y1 - 2007/8/24

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

SN - 0031-9007

VL - 99

SP - 085001

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

ER -

Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces

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Keywords

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