Персона: Мамонов, Дмитрий Николаевич
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Effect of liquid medium viscosity on laser cleaning of surface with artificial radioactive contamination
High-power short-pulse solid-state microlaser with segmented diode pumping
© 2020 Optical Society of AmericaIn this study, the mechanism of pulse generation is investigated in a compact laser system based on YAG:Nd3+ with passive Q-switching, which utilizes segmented pumping of the active medium by seven quasicontinuous laser diodes with fiber-optic radiation outputs. The dependence of lasing on the individual and correlative properties of pumping channels is studied in general and upon disabling one or several pumping channels. The maximum output emission energy achieved is 20 mJ for a synchronous pulse with a duration of 3.3 ns. The possibility of obtaining a stable optical breakdown of air using the developed laser is experimentally confirmed, facilitating its practical application in, for example, the ignition of combustible mixtures.
Laser surface cleaning of simulated radioactive contaminants in various technological environments
Optimization of laser cleaning conditions using multimode short-pulse radiation
© 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.
Наблюдение когерентного канала генерации при спектральном сложении излучений лазерных диодов
При экспериментальных исследованиях некогерентного сложения излучений лазерных диодов по схеме спектрального сложения был обнаружен дополнительный канал когерентной генерации, способный приводить к существенным потерям в основном канале.