Non-Destructive Laser Induced Breakdown Spectroscopy
Collaborators: T. Pollock, J.W. Jones, J. Nees, J. Whitaker, R. Clark, A. Galvanuskas,
University of Michigan
Materials: Semiconductors Metals Ceramics
The optical emission accompanying laser induced breakdown of material can be collected and spectrally analyzed to determine the chemical constituents that comprise the material under consideration. This technique, known as laser induced breakdown spectroscopy (LIBS), has been applied to a wide range of materials, in all physical states (solid, liquid and gas) and in a range of environments. Analysis of chemical content with LIBS requires laser ablation or removal of very small amounts of material (typically nanograms - picograms), yielding damage features on the surface of a sample as small as 10's of micrometers in width and 100's of nm in depth, such that the technique is considered virtually non-destructive. The LIBS technique has recently gained popularity in the industrial arena as chemical analysis can be performed quickly and in-line with other material processing and quality control elements.
The aim of LIBS research in the Yalisove Group is twofold: first we wish to advance the use of femtosecond laser based LIBS for the analysis of a range of materials, particularly those related to the Hyperspectral and Extreme Light Diagnostics for Defense-Critical Advanced Materials and Processes MURI grant. Second, dual-pulse techniques are being investigated to further reduce the damage necessary for LIBS analysis of sensitive and precious materials. The equiptment associated with these efforts includes a CPA-2001 Ti:sapphire femtosecond pulsed laser (Clark-MXR, Dexter MI) and an Andor Mechelle spectrograph coupled to an Andor iStar cooled CCD camera.