Spectroscopic studies of iron plasmas induced by continuous high-power CO2 laser

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Abstract
Some basic aspect concerning spectroscopic determination of electronic density and temperature of high power (1KW to 10KW) laser-induced iron plasmas are discussed. Spatial evolution of the temperature into the key hole and above the target has been measured for different shielding gases and different power densities. At power densities of the order of 1.0-2.0 MW/cm2 the evolution of the temperature with the height over the target depends strongly on the shielding gas. Some spectral lines identified as corresponding to Fe(II) transitions have also been observed. From the measured temperatures and relative intensities ratios between lines corresponding to Fe(I) and Fe(II) , electronic densities have been calculated.

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