Abstract: My research interests are in the area of fabrication, characterization, and processing of carbon-based semiconductor thin films and nanostructures. I use fundamentally non-equilibrium pulsed laser deposition and pulsed laser annealing processes for the formation of novel quenched solid phase of carbon (Q-carbon) at room temperature and atmospheric pressure for electron field-emission device applications. The devices have shown excellent electric field enhancement, very low turn-on electric fields and high emission current densities over long periods with tremendous stability even at high temperatures. In this seminar, I will discuss the direct conversion of crystalline carbon nanotube (CNT) and amorphous carbon structures into nanostructured diamond by nanosecond pulsed laser annealing. The laser-irradiated CNT structures with nanodiamond seeds were used to grow large diamond crystals and hollow conductive diamond tubes in hot filament chemical vapor deposition.