Study of nanoparticle production from yttrium oxide by pulse-periodic radiation of ytterbium fibre laser
| Autor: | Andrey V. Podkin, Vasiliy V. Lisenkov, Vladimir V. Osipov, Vyacheslav V. Platonov, Egor V. Tikhonov |
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| Rok vydání: | 2017 |
| Předmět: |
Ytterbium
Materials science medicine.medical_treatment chemistry.chemical_element 02 engineering and technology Radiation 01 natural sciences law.invention law Fiber laser 0103 physical sciences medicine General Materials Science Laser power scaling 010302 applied physics business.industry Drop (liquid) General Chemistry Yttrium 021001 nanoscience & nanotechnology Laser Ablation chemistry Optoelectronics 0210 nano-technology business |
| Zdroj: | Applied Physics A. 124 |
| ISSN: | 1432-0630 0947-8396 |
| Popis: | The paper was devoted to investigation of Nd:Y2O3 nanopowder production by laser evaporation. The main attention is paid to investigating the features of evaporation and ablation of target by a ytterbium fibre laser radiation: formation of irregularities on a target surface, low relative yield of nanopowder, a long-term ablation in the form of drops, and the regime of ablation. With a high-speed camera it was shown that the transfer from vapour to drop ablation at the radiation power density of 0.46 ÷ 1.4 MW/cm2 occurs in 150 ÷ 200 µs after the start of laser action on a target. It is possible to substantially reduce spattering of drops and increase the relative yield of nanopowder to 30% of target weight by choosing the laser pulse duration shorter then this value. The optimal conditions have been found for producing nanopowder in the regime of pulse-periodic radiation with a peak laser power of 600 W, in which enrichment of nanopowder by neodimium does not exceed 12% of its contents in the target. The obtained nanopowders are weakly agglomerated, nanoparticles have a spherical shape, monoclinic phase, and their average diameter is 8.5 nm. |
| Databáze: | OpenAIRE |
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