X-ray emission from aluminium under intense, ultrashort irradiation
Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
Revised: 29 November 1999
Published online: 15 August 2000
We present studies of X-ray emission from aluminium under picosecond and femtosecond irradiation in the intensity range ~ 1012–1015 W cm-2. We use a new and simple method to measure spectrally resolved absolute X-ray yields. It is shown that the X-ray yields can be obtained for arbitrary levels of X-ray flux. We present details of the variation of the absolute yields as a function of wavelength, intensity, polarization and pulse duration of the incident laser radiation. Electron temperatures in the keV range are observed at 1015 W cm-2 with femtosecond laser pulses.
PACS: 52.25.Nr – Emission, absorption, and scattering of X and γ-radiation / 52.40.Nk – Laser-plasma interactions (e.g., anomalous absorption, backscattering, magnetic field generation, fast particle generation) / 52.50.Jm – Plasma production and heating by laser beams
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000