**About the Editors**

**Krzysztof M. Abramski** (Prof.) received his MSc and PhD in electronics from Wrocław University of Technology, Poland, in 1971 and 1978, respectively. At that time, he worked on the frequency stabilization of gas laser radiation (He-Ne/CH 4 ) and many aspects of spectral properties of laser radiation. In 1983-84, he worked as the Research Fellow in Quantum Electronics Group, Twente University of Technology, the Netherlands (optogalvanic effects in CO2 , CO lasers, high pressure XeCl excimer lasers). In 1987, he spent half a year in the Department of Applied Physics, Hull University, England; after that, for over four years, till 1992, he worked as a visiting scientist at Optoelectrionics and Lasers Engineering Group, Heriott-Watt University, Edinburgh, working on different aspects of RF excited CO2 lasers (wavegudes, slab-waveguides, waveguide arrays, phase locking structures). He returned to Wroclaw in 1993, where he started creating the Laser and Fiber Electronics Group. In 2006, he initiated the popular teaching specialization "Optocommunications", and in 2011, he initiated the English MSc program "Advanced Applied Electronics" (about 20–30 student per course). In 2016, he initiated the English engineering program "Electronic and Computer Engineering" (about 45–50 students per course) at the Electronics Faculty. His scientific interests include optical fiber lasers (cw tunable, femtosecond, combs), microchip solid state diode pumped, optical fiber sensors, free-space and optical fiber communications, and laser spectroscopy. He has supervised 21 doctoral candidates. He currently holds the position of a full professor (and from 2018, of professor emeritus).

**Piotr Jaworski** (Dr.) received his PhD in Physics from Heriot-Watt University, Edinburgh, UK in 2015. During his PhD studies, he was working on the development of novel anti-resonant hollow-core fibers for the delivery of high-peak power-pulsed laser light in the near-IR and visible spectral range, and their application in precision micro-machining. After that, in 2015, he joined the Lukasiewicz Research Network - PORT Institute (before Wroclaw Research Center EIT+) as a research engineer in the Laser Sensing Laboratory. Since that time, his research work has been focused on laser-based gas sensing using both bulk optics-based and hollow-core fiber-based gas spectrometers. In 2018, he became the head of the Laser Sensing Laboratory in PORT. In 2019, he joined the Laser and Fiber Electronics Group at Wroclaw University of Science and Technology focusing his research on gas sensing using hollow-core micro-structured fibers. Piotr Jaworski is an author and co-author of 56 research articles, conference proceedings and conference presentations. He has been a main investigator in eight research projects and principal investigator in one research grant. He has also developed two laser-based gas sensing systems for industrial enterprises from Poland.
