Studies of spectral line merging in a laser-induced hydrogen plasma diagnosed with two-color Thomson scattering.

Laser-induced hydrogen plasma in the density and temperature range of (0.1-5)×10^{23}m^{-3} and (6000-20000)K, respectively, was precisely diagnosed using two-color Thomson scattering technique, inferring the electron number density, electron temperature as well as ion temperature. Simultaneously, spectra of the Balmer series of spectral lines from H-β to H-ζ were measured and plasma emission coefficient calculated within the quasicontiguous frequency-fluctuation model.

Structural and Optical Properties of Pure and Sulfur-Doped Silicate-Phosphate Glass.

A series of silicate-phosphate glass materials from the SiO-PO-KO-MgO system (pure and doped with sulfur ions) were synthesized by melting raw material mixtures that contained activated carbon as a reducer. The bulk composition of glass was confirmed with X-ray fluorescence spectroscopy. The homogeneity of the glass was confirmed through elemental mapping at the microstructural level with scanning electron microscopy combined with an analysis of the microregions with energy-dispersive X-ray spectroscopy.

Experimental investigations of plasma perturbation in Thomson scattering applied to thermal plasma diagnostics.

Time and space resolved measurements of Thomson scattering of 532 nm , 6 ns laser pulses were performed on argon thermal discharge plasma with electron temperature T(e)>10,000 K and electron density 8 x 10(22) m(-3)< n(e)<2 x 10(23) m(-3). From these measurements, variations of the electron density and temperature across the laser beam and their evolution during the laser pulse were determined. While the electron density is augmented by no more than a few percent the electron temperature is significantly increased along the axis of the laser beam due to laser heating.