Laser Materials Science Group
Materials Science Division
Massachusetts Institute of Technology
University of California - Davis
I currently serve as Group Leader of the Laser Materials Science group in MSD. My research interests include laser-matter interaction science, novel applications in laser-assisted material processing and in situ characterization of fast processes. A central focus of my group is currently laser-based, metal additive manufacturing (AM) which involves probing the physics and improving the process of AM for improved performance of metal components. We have developed several R&D platforms to study metal AM, using optical, X-ray, and thermal probes to characterize the laser-matter interactions and dynamics of the process. I currently lead a lab initiative on modulating beam shape and pulse formats of lasers used for metal AM as a means of controlling solidification microstructure and residual stress. Other laser processing activities have included laser-based CVD of optical and ultra-hard materials, nano-coarsening of metal films, and non-contact laser polishing of glass. To improve the optical performance of high power optics, I have led activities focused on understanding optical damage and helped lay the foundational science for laser-based damage mitigation processes. In terms of characterization, I have interests in pump-probe, vibrational spectroscopy, plasma spectroscopy, and ultra-high-speed imaging of transient processes. Prior to LLNL, I was a member of the technical staff at Bell Labs in Murray Hill, NJ and worked on materials characterization of optical devices using novel spectroscopic techniques, stress-induced birefringence management in planar optical devices, and research in advanced broadband access networks.