**About the Editors**

**J ¨orn Bonse** (Dr.) is a tenured scientist at the German Federal Institute for Materials Research and Testing (BAM) in Berlin, Germany. His research interests include the fundamentals and applications of laser–matter interaction, especially with respect to ultrashort laser pulses, laser-induced periodic nanostructures, time-resolved optical techniques, laser processes in photovoltaics, surface functionalization, and laser safety. He received a doctoral degree in Physics from the Technical University of Berlin (Germany) in 2001 and a diploma degree in Physics from the University of Hannover (Germany) in 1996. Dr. Bonse has occupied various research positions at institutions such as the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) in Berlin, the Spanish Research Council (CSIC) in Madrid (Spain), and the Laser Zentrum Hannover (LZH) in Hannover. He was appointed as a senior laser application specialist at Newport's Spectra-Physics Lasers Division in Stahnsdorf, Germany. Dr. Bonse is a member of the German Physical Society (DPG) and of the European Materials Research Society (E-MRS). In 1999, he was a recipient of an award for applied research, presented by the federal German state Thuringia, for the development of high-power fiber lasers. He received an OSA Outstanding Reviewer Award from the Optical Society of America in 2013. Between 2014 and 2017 he served as an Associate Editor for the journal Optics Express of the Optical Society of America. He has authored more than 150 refereed journal publications and 2 patents related to his research activities.

**Dirk Spaltmann** (Dr.) is a senior scientist at the German Federal Institute for Materials Research and Testing (BAM) in Berlin, Germany. His research interests include the tribological performance and wear resistance of (DLC-) coatings as well as new materials under slip-rolling, reciprocating–sliding, and extreme-pressure conditions, giving special consideration to tribometric, standardization, and data management aspects. He received a doctoral degree (Ph.D.) in Physics from the University of Wales, College of Cardiff (UWCC, Great Britain) in 1993 and a diploma degree in Physics from the RWTH Aachen University (Germany) in 1989. After a two-year post-doctoral position at UWCC, Dr. Spaltmann took up work at a start-up company near Berlin (Germany) as head of research and development as well as production. In 1999, he joined the Macro-Tribology and Wear Protection group of BAM (Germany). Dr. Spaltmann is a member of the German Physical Society (DPG), the German Tribology Association (GFT), and the German Hydrogen and Fuel-Cell Association (DWV). He is a recognized reviewer for several well-known journals, has authored more than 70 refereed journal publications, and holds 9 patents related to his career activities.
