On the mechanism of deep craters formation under the action of high power ytterbium-fiber laser(Conference Paper)(Open Access)
- aInstitute of Electrophysics, Ural Branch, Russian Academy of Sciences, Amundsen 106, Ekaterinburg, 620016, Russian Federation
- bUral Federal University, Lenina Avenue 51, Ekaterinburg, 620000, Russian Federation
- cLebedev Physical Institute, Russian Academy of Sciences, Leninsky Avenue 53, Moscow, 119991, Russian Federation
Abstract
Stability of a liquid crater wall formed under the action of an ytterbium-fiber laser in the course of the Nd3+:Y2O3 nanopowder production is studied theoretically. It has been shown that hydrodynamic instability can develop on the melt-vapor interface as a result of the tangential discontinuity of the velocity between the vapor stream and molten crater wall. The characteristic spatial and temporal scales are estimated in the framework of the proposed qualitative model, they are found to be 20-90 μm and 20-50 μs, respectively, that is in good agreement with experimental data. Thus, the droplet formation time (during which the amplitude of the boundary perturbation reaches the wavelength order) is much smaller than a pulse duration of the ytterbium-fiber laser (1360 μs). This means that a significant amount of material can be removed from the crater due to formation of microscale droplets during the irradiation. This mechanism can explain the much greater crater depth for the fiber laser than for CO2 laser (a pulse duration for which is 370 μs). © Published under licence by IOP Publishing Ltd.
Indexed keywords
| Engineering controlled terms: | Carbon dioxideDropsFiber lasersFibersYtterbium |
|---|---|
| Engineering uncontrolled terms | Boundary perturbationsDroplet formationHydrodynamic instabilitiesMelt-vapor interfaceNanopowder productionsSpatial and temporal scaleTangential discontinuitiesYtterbium fiber laser |
| Engineering main heading: | Equations of state |
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Russian Foundation for Basic Research | 14-08-00181,16-38-60002 | РФФИ |
| Ural Branch, Russian Academy of Sciences | 15-17-2-19,SP-132.2016.1 | UB RAS |
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1
The work was supported by the Russian Foundation for Basic Research (projects No. 16-38-60002 and 14-08-00181), the Presidium of the Ural Branch of the Russian Academy of Sciences (project No. 15-17-2-19) and Presidential Programs of Grants in Science (project No. SP-132.2016.1).
- ISSN: 17426588
- Source Type: Conference Proceeding
- Original language: English
- DOI: 10.1088/1742-6596/774/1/012121
- Document Type: Conference Paper
- Volume Editors: Karamurzov B.S.,Khishchenko K.V.,Kadatskiy M.A.,Efremov V.P.,Fortov V.E.,Sultanov V.G.
- Sponsors: Russian Academy of Sciences,Russian Foundation for Basic Research
- Publisher: Institute of Physics Publishing
© Copyright 2018 Elsevier B.V., All rights reserved.
Cited by 1 document
(2018) Journal of Physics: Conference Series