Abstract

Aluminum x-ray emission near the He-α resonance line from high-intensity $(>{10}^{19} \mathrm{W}/{\mathrm{cm}}^2)$ subpicosecond laser–plasma interaction is presented. Obtention of characteristics of x-ray lines is significant of laser-beam interaction with dense matter, as long as the contribution of the laser-pulse pedestal is weak. By studying the evolution of x-ray spectra versus laser-intensity and laser-pulse shape, we correlate the laser-intensity contrast ratio, the density-gradient scale length, and the duration of the x-ray pulses. Such a plasma is a bright and short x-ray source.

© 1997 Optical Society of America

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