Bright multi-keV harmonic generation from relativistically oscillating plasma surfaces

被引：210

作者：

Dromey, B. ^{[1
]}

Kar, S.

Bellei, C.

Carroll, D. C.

Clarke, R. J.

Green, J. S.

Kneip, S.

Markey, K.

Nagel, S. R.

Simpson, P. T.

Willingale, L.

McKenna, P.

Neely, D.

Najmudin, Z.

Krushelnick, K.

Norreys, P. A.

Zepf, M.

机构：

[1] Queens Univ Belfast, Dept Phys & Astron, Belfast BT7 1NN, Antrim, North Ireland

[2] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England

[3] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland

[4] CCLRC Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.99.085001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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).

引用

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