Abstract
An absolutely calibrated spectrograph based on a new single x-ray optical element, namely, an elliptical off-axis reflection zone plate, has been used for brilliance measurements of a laser-produced plasma of solid carbon and boron nitride. The spectral range investigated, covers the emission from excited H- and He-like carbon states to the ground state. The plasma was generated by a subpicosecond high-intensity KrF*-laser pulse at an intensity of Under these conditions more than photons/sr per pulse were emitted in the strongest lines, demonstrating that this plasma can serve as an intense x-ray source. The measured spectra were in good agreement with a simulation that used the radiation program ration for an electron density of and an electron temperature of Measurements of spectral changes at different angles of incidence of the laser beam confirmed theoretical predictions for line intensities.
© 1998 Optical Society of America
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