 The oxygen content plays a key role in determining the crystal structure of metallic glasses. When the oxygen content is low, the glass is X-ray amorphous, when it is high, it is partially crystalline. Laser melting of these substrates produces single laser tracks, which are then characterized using atom probe tomography and transmission electron microscopy. These techniques reveal that the presence of CU-Ox and crystalline ZRO particles in the melt pool is caused by surface oxide redistribution and convection. This redistribution of oxygen from the surface into the melt pool is believed to be responsible for the formation of these particles. This article was authored by Inga K. Getz, Victor Pacheco, Carl J. Hasala, and others.