Graduate Thesis Or Dissertation
 

Investigation of the relationships between laser energy and vaporized target material, continuum intensity, and plume energy in laser plume spectroscopy

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  • A focused Q-switched neodymium-doped glass laser with power levels ranging from 1-6 MW and with a 50-nsec halfwidth, was used to vaporize copper metal. Experimental measurements showed that the amount of material vaporized away from the target was not linear with laser power and was much less than could be accounted for by the laser energy available. Amounts of copper in the 0.0X μg range were measured for the power range investigated. Experimental methods are described to monitor the power and energy of the laser beam as the target material was vaporized and collected for measurement. Photodiode monitors were built to measure simultaneously the plume plasma continuum intensity and the laser beam power and energy. The measurements showed a linear increase in the plume continuum emission as a function of laser beam power. The total emission seen by the photodiode was shown to be approximately linearly related to the energy transferred to the plume plasma. The energy that could not be accounted for by the vaporized material was shown, using reasonable assumptions, to be governed by the laser beam energy losses to the plume plasma. The shape of the theoretically calculated curve was found to be consistent with the experimental measurements, giving evidence that energy is being transferred to the plume plasma approximately linearly as a function of laser beam power. This energy might otherwise have been used in vaporizing target material for analytical purposes.
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