High brightness kev harmonics from relativistically oscillating plasma surfaces

Dromey, B. and Adams, D. and Kar, S. and Bellei, C. and Carroll, D.C. and Clarke, R.J. and Green, J.S. and Kneip, S. and Mckenna, Paul (2009) High brightness kev harmonics from relativistically oscillating plasma surfaces. European Physical Journal - Special Topics, 175 (1). pp. 57-60. ISSN 1951-6355

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Abstract

X-ray harmonic radiation extending to 3.3 angstrom, 3.8 keV from Petawatt class laser-solid interactions is presented. The harmonic spectra display a relativistic limit scaling up to similar to 3000th order, above which an intensity dependent scaling roll-over is observed. Highly directional beamed emission for harmonic photon energy h nu > 1 keV is found to be into a cone angle <4 degrees, significantly less than that of the incident laser cone (20 degrees).