Laser plume evolution in the process of nanopowder preparation using an ytterbium fibre laser
| Autor: | Vladimir V. Osipov, Kirill V. Fedorov, E. V. Tikhonov, V. V. Lisenkov, Maxim V. Trigub, G. S. Evtushenko, V. V. Platonov, A. V. Podkin |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Ytterbium Materials science business.industry chemistry.chemical_element Statistical and Nonlinear Physics Plasma Radiation Laser 01 natural sciences humanities Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Flash (photography) Optics Impact crater chemistry law Fiber laser 0103 physical sciences Electromagnetic shielding Electrical and Electronic Engineering business |
| Zdroj: | Quantum Electronics. 46:821-828 |
| ISSN: | 1468-4799 1063-7818 |
| DOI: | 10.1070/qel16023 |
| Popis: | We study the laser plume dynamics by means of high-speed shooting in the intrinsic light, as well as using the shadow method with a laser monitor. It is found that the laser plume arising under the impact of a radiation pulse from an ytterbium fibre laser with a power of on a target with an Nd concentration of 1 mol % is first a plasma consisting of the target material vapour, and then becomes a mixture of vapour and droplets. The first droplets in this plasma appear in after the formation of the laser plume, and in the major part of the substance is removed in the form of liquid droplets. We have also found that the depth of the laser-produced crater linearly depends on the laser pulse duration, thus confirming the absence of essential shielding of laser radiation by melt droplets. The higher the target transparency, the longer the delay time of the formation of the laser plume and the greater its spread. Sometimes, instead of the laser plume formation, one can observe a light flash inside a semitransparent target. The explanation of these results is presented. |
| Databáze: | OpenAIRE |
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