U. Teubner et al., MECHANISMS AND ORIGIN OF CONTINUUM AND LINE EMISSION FROM CARBON PLASMAS PRODUCED BY ULTRASHORT LASER-PULSES, Journal of physics. B, Atomic molecular and optical physics, 29(19), 1996, pp. 4333-4346
We report on a detailed experimental study of the x-ray continuum and
line emission from subpicosecond UV-laser-produced carbon plasmas. By
using well defined laser pulse conditions and various angles of incide
nce and intensities (up to 10(17) W cm(-2)) the spectra of the. plasma
emission have been observed in the soft x-ray region (10-100 Angstrom
) which is of particular interest for many applications based on a las
er-plasma x-ray source. The experiment shows that the x-ray yield, the
x-ray pulse duration, the spectral region and the bandwidth etc diffe
r significantly between the continuum and the line emission. The diffe
rent scalings observed for the experimental parameters have been relat
ed to the mechanism of laser pulse absorption and of the conversion pr
ocess of the absorbed energy into x-ray emission. The results have als
o been compared to previous measurements on aluminium plasmas.