The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions
In this work, the conversion efficiency of Cr4+ ions and the optical properties of ceramics based on chromium-doped yttrium aluminum garnet were investigated. Increasing the conversion efficiency of Cr3+ to Cr4+ opens up broad prospects for using YAG ceramics as saturable absorbers for passive Q-swi...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Saint Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO University)
2022-10-01
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| Series: | Naučno-tehničeskij Vestnik Informacionnyh Tehnologij, Mehaniki i Optiki |
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| Online Access: | https://ntv.ifmo.ru/file/article/21513.pdf |
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| author | Fedor F. Malyavin Alexander A. Kravtsov Vitaly A. Tarala Irina S. Chikulina Dmitry S. Vakalov Viacheslav A. Lapin Marina S. Nikova Svetlana E. Khoroshilova Evgenii V. Medyanik Dmitry S. Kuleshov |
| author_facet | Fedor F. Malyavin Alexander A. Kravtsov Vitaly A. Tarala Irina S. Chikulina Dmitry S. Vakalov Viacheslav A. Lapin Marina S. Nikova Svetlana E. Khoroshilova Evgenii V. Medyanik Dmitry S. Kuleshov |
| author_sort | Fedor F. Malyavin |
| collection | DOAJ |
| description | In this work, the conversion efficiency of Cr4+ ions and the optical properties of ceramics based on chromium-doped yttrium aluminum garnet were investigated. Increasing the conversion efficiency of Cr3+ to Cr4+ opens up broad prospects for using YAG ceramics as saturable absorbers for passive Q-switching of Nd- and Yb-solid-state lasers.
The aim of this work was to study the effect of magnesium oxide concentration on the conversion efficiency of Cr3+ to Cr4+ under conditions of Al3+ (4.8 mol.%) and Y3+ (2.9 mol.%) cations excess in the garnet structure as well as the stoichiometric ratio Y3+/Al3+ = 3/5. The possibility of changing the concentration of Cr4+ ions in both the octahedral and tetrahedral positions due to the formation of magnesium substitution defects when the composition deviates from the yttrium-aluminum garnet stoichiometry has been studied. Chromium-doped transparent optical ceramics based on yttrium-aluminum garnet with different ratios of Y3+/Al3+ cations was obtained by the two-stage coprecipitation method. Magnesium oxide was used as a sintering additive and charge compensator for converting chromium ions from the
trivalent to the tetravalent state in concentrations of 0 to 0.2 wt.%. It was found that aluminum excess in the yttriumaluminum garnet matrix leads to a decrease in the Cr3+ to Cr4+ conversion efficiency. A deviation of stoichiometry towards an excess of yttrium leads to a decrease of air annealing temperature for oxidizing chromium ions to the tetravalent state and their transition to the tetrahedral position. However, the samples optical transmittance with an excess of yttrium was lower than in the cases of an excess of aluminum and stoichiometry. It was found that with an increase in the vacuum sintering temperature from 1780 to 1820 °C in the samples with an excess of aluminum, an increase in the
concentration of Cr4+ ions in the tetrahedral position occurs, as evidenced by higher absorption intensity at a wavelength of 1030 nm. For the cases of stoichiometry and an excess of yttrium in garnet, this effect is less pronounced. Samples of optical ceramics of yttrium-aluminum garnet with a light transmission of more than 75 % in the visible and near-IR ranges with pronounced absorption bands of chromium have been obtained. The results of the work can be applied to the creation of passive switches for solid-state lasers. |
| first_indexed | 2024-04-13T18:04:16Z |
| format | Article |
| id | doaj.art-118ff528a3ba43a9a938630955a7a076 |
| institution | Directory Open Access Journal |
| issn | 2226-1494 2500-0373 |
| language | English |
| last_indexed | 2024-04-13T18:04:16Z |
| publishDate | 2022-10-01 |
| publisher | Saint Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO University) |
| record_format | Article |
| series | Naučno-tehničeskij Vestnik Informacionnyh Tehnologij, Mehaniki i Optiki |
| spelling | doaj.art-118ff528a3ba43a9a938630955a7a0762022-12-22T02:36:06ZengSaint Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO University)Naučno-tehničeskij Vestnik Informacionnyh Tehnologij, Mehaniki i Optiki2226-14942500-03732022-10-0122591292010.17586/2226-1494-2022-22-5-912-920The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ionsFedor F. Malyavin0https://orcid.org/0000-0002-5255-9346Alexander A. Kravtsov1https://orcid.org/0000-0002-0645-1166Vitaly A. Tarala2https://orcid.org/0000-0001-6688-2681Irina S. Chikulina3https://orcid.org/0000-0002-0871-8776Dmitry S. Vakalov4https://orcid.org/0000-0001-6788-3811Viacheslav A. Lapin5https://orcid.org/0000-0002-1938-4134Marina S. Nikova6https://orcid.org/0000-0001-8810-4493Svetlana E. Khoroshilova7https://orcid.org/0000-0002-4287-8183Evgenii V. Medyanik8https://orcid.org/0000-0002-5947-7810Dmitry S. Kuleshov9https://orcid.org/0000-0003-4314-1578Head of Laboratory, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 55748614600PhD, Senior Researcher, Federal Research Center of the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, 344006, Russian Federation; Scientific Researcher, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 57191056680PhD (Chemistry), Head of Laboratory Complex, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 36873277700Head of Laboratory, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 57204186833PhD (Physics & Mathematics), Head of Laboratory, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 57204185431PhD, Senior Researcher, Federal Research Center of the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, 344006, Russian Federation; Scientific Researcher, North- Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 55748317300PhD, Engineer, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 57214126664PhD (Chemistry), Leading Researcher, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 23990875300Leading Engineer, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 57204793700Engineer, North-Caucasus Federal University, Stavropol, 355009, Russian Federation, sc 55748259500In this work, the conversion efficiency of Cr4+ ions and the optical properties of ceramics based on chromium-doped yttrium aluminum garnet were investigated. Increasing the conversion efficiency of Cr3+ to Cr4+ opens up broad prospects for using YAG ceramics as saturable absorbers for passive Q-switching of Nd- and Yb-solid-state lasers. The aim of this work was to study the effect of magnesium oxide concentration on the conversion efficiency of Cr3+ to Cr4+ under conditions of Al3+ (4.8 mol.%) and Y3+ (2.9 mol.%) cations excess in the garnet structure as well as the stoichiometric ratio Y3+/Al3+ = 3/5. The possibility of changing the concentration of Cr4+ ions in both the octahedral and tetrahedral positions due to the formation of magnesium substitution defects when the composition deviates from the yttrium-aluminum garnet stoichiometry has been studied. Chromium-doped transparent optical ceramics based on yttrium-aluminum garnet with different ratios of Y3+/Al3+ cations was obtained by the two-stage coprecipitation method. Magnesium oxide was used as a sintering additive and charge compensator for converting chromium ions from the trivalent to the tetravalent state in concentrations of 0 to 0.2 wt.%. It was found that aluminum excess in the yttriumaluminum garnet matrix leads to a decrease in the Cr3+ to Cr4+ conversion efficiency. A deviation of stoichiometry towards an excess of yttrium leads to a decrease of air annealing temperature for oxidizing chromium ions to the tetravalent state and their transition to the tetrahedral position. However, the samples optical transmittance with an excess of yttrium was lower than in the cases of an excess of aluminum and stoichiometry. It was found that with an increase in the vacuum sintering temperature from 1780 to 1820 °C in the samples with an excess of aluminum, an increase in the concentration of Cr4+ ions in the tetrahedral position occurs, as evidenced by higher absorption intensity at a wavelength of 1030 nm. For the cases of stoichiometry and an excess of yttrium in garnet, this effect is less pronounced. Samples of optical ceramics of yttrium-aluminum garnet with a light transmission of more than 75 % in the visible and near-IR ranges with pronounced absorption bands of chromium have been obtained. The results of the work can be applied to the creation of passive switches for solid-state lasers.https://ntv.ifmo.ru/file/article/21513.pdfoptical transparent ceramicsyttrium aluminum garnetsaturable absorbers for passive q-switchingoptical transmission spectrastoichiometrychromium |
| spellingShingle | Fedor F. Malyavin Alexander A. Kravtsov Vitaly A. Tarala Irina S. Chikulina Dmitry S. Vakalov Viacheslav A. Lapin Marina S. Nikova Svetlana E. Khoroshilova Evgenii V. Medyanik Dmitry S. Kuleshov The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions Naučno-tehničeskij Vestnik Informacionnyh Tehnologij, Mehaniki i Optiki optical transparent ceramics yttrium aluminum garnet saturable absorbers for passive q-switching optical transmission spectra stoichiometry chromium |
| title | The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions |
| title_full | The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions |
| title_fullStr | The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions |
| title_full_unstemmed | The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions |
| title_short | The impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions |
| title_sort | impact of yttrium aluminum garnet stoichiometry deviation on the conversion efficiency of tetravalent chromium ions |
| topic | optical transparent ceramics yttrium aluminum garnet saturable absorbers for passive q-switching optical transmission spectra stoichiometry chromium |
| url | https://ntv.ifmo.ru/file/article/21513.pdf |
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