When: October 07, 16:00
Where: Skoltech, MR-408 (TROC-3, Blue building)
LHP Seminar:
Laser-matter interaction in new regimes of material processing: Toward more knowledge and better control
N.M. Bulgakova
HiLASE Centre, Institute of Physics of the Czech Academy of Sciences,
Dolní Břežany, Czech Republic
Abstract:
Development of new types of lasers with broad irradiation parameters widens the spectrum of viable laser applications in various fields of science, industry, and medicine. One of strategic goals of the HiLASE Centre is to develop novel applications of these versatile laser sources in material science. A laser application laboratory, which is now under completion, will combine state-of-the-art lasers with the most advanced diagnostics for investigations of interaction of laser light with different materials at the frontier of material science. An essential feature of the new application laboratory is a tight link between experimental and theoretical studies, a concept which already brings fruitful outcomes. Deep understanding of the fundamental phenomena involved in the laser action on materials of different kinds makes possible the elaboration of new approaches, new methodologies, and novel applications.
In this talk, the latest achievements of the HiLASE Centre in the field of laser material science will be presented. This includes comprehensive studies of ultrashort pulse laser action on transparent materials with new insights into mechanisms of material damage, revealing the ways for strong localized absorption of laser light inside bulk dielectrics with generation of pressures of hundreds of gigapascals, extension of the plasmonic theory to lossy materials which has enabled to outline ways for high-quality material nanostructuring, uncovering the crucial role of accumulation of metastable states of air molecules in air breakdown upon ultrashort laser processing of materials and its dependence on pulse repetition rate. Several comprehensive theoretical approaches used in our studies will be unveiled, including one of the most advanced model for simulations of laser energy coupling to transparent materials under the regimes of direct laser writing of 3D photonic structures, with examples of their applications to real experimental conditions. Finally, further perspectives of laser-matter interaction studies at the HiLASE Centre will be discussed.
BIO:
Nadezhda M. Bulgakova studied physics at the Novosibirsk State University, Russia (Chair of Plasma Physics). After graduation, she joined the Institute of Thermophysics (Siberian Branch of Russian Academy of Sciences) where she received Ph.D. degree in 1985 and Dr.Sc. degree in 2002. Her research interests include dynamics of plasma plumes during pulsed laser ablation of solids; processes in solid targets absorbing laser radiation; critical phenomena at pulsed laser ablation; cluster formation in free gaseous jets and laser-ablation plumes; gas discharges; plasma-chemical reactions.