2020, Kravchenko, Y. V., Klimentov, S. M., Derzhavin, S. I., Mamonov, D. N., Karpov, N. V., Mayorov, A. N., Климентов, Сергей Михайлович, Мамонов, Дмитрий Николаевич, Майоров, Алексей Николаевич

© 2020, Springer Science+Business Media, LLC, part of Springer Nature.Aiming at significant enhancement of laser cleaning efficiency and productivity, we studied several typical experimental cases including removal of contaminated layers from absorbing surfaces, paying special attention to elimination of the thick rusty layers, and removal of absorbing coatings from transparent substrates. Nanosecond pulses of Nd:YAG laser were used in all the cases at variation of the mode content of the laser beam which was achieved by applying a multimode fiber delivery of radiation. Both, air and water ambient were used in the experiments. The results are discussed in terms of plasma microexplosions in the domain of the substrate–layer interface and the vapor bubbles formation inside the thick rusty layer impregnated with liquid.

2024, Ivanov, D. S., Shakhov, P., Tikhonowsky, G., Popov, A. A., Mayorov, A. N., Zavestovskaya, I. N., Klimentov, S. M., Шахов, Павел Владимирович, Тихоновский, Глеб Валерьевич, Попов, Антон Александрович, Майоров, Алексей Николаевич, Завестовская, Ирина Николаевна, Климентов, Сергей Михайлович

2020, Izgin, T., Veiko, V. P., Rethfeld, B., Garcia, M. E., Ivanov, D. S., Maiorov, A. N., Dombrovska, Y. I., Zavestovskaya, I. N., Klimentov, S. M., Иванов, Дмитрий Сергеевич, Майоров, Алексей Николаевич, Завестовская, Ирина Николаевна, Климентов, Сергей Михайлович

We present a framework based on the atomistic continuum model, combining the Molecular Dynamics (MD) and Two Temperature Model (TTM) approaches, to characterize the growth of metal nanoparticles (NPs) under ultrashort laser ablation from a solid target in water ambient. The model is capable of addressing the kinetics of fast non-equilibrium laser-induced phase transition processes at atomic resolution, while in continuum it accounts for the effect of free carriers, playing a determinant role during short laser pulse interaction processes with metals. The results of our simulations clarify possible mechanisms, which can be responsible for the observed experimental data, including the presence of two populations of NPs, having a small (5-15 nm) and larger (tens of nm) mean size. The formed NPs are of importance for a variety of applications in energy, catalysis and healthcare.