In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals
LaBGeO<sub>5</sub> (LBGO) crystals are unique ferroelectric materials for manufacturing highly efficient UV laser sources based on frequency conversion. This is due to their low cut-off wavelength, high nonlinear-optical coefficients, and non-hygroscopicity. Periodical poling requires a...
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MDPI AG
2020-07-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/10/7/583 |
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| author | Andrey Akhmatkhanov Constantine Plashinnov Maxim Nebogatikov Evgenii Milov Ilya Shnaidshtein Vladimir Shur |
| author_facet | Andrey Akhmatkhanov Constantine Plashinnov Maxim Nebogatikov Evgenii Milov Ilya Shnaidshtein Vladimir Shur |
| author_sort | Andrey Akhmatkhanov |
| collection | DOAJ |
| description | LaBGeO<sub>5</sub> (LBGO) crystals are unique ferroelectric materials for manufacturing highly efficient UV laser sources based on frequency conversion. This is due to their low cut-off wavelength, high nonlinear-optical coefficients, and non-hygroscopicity. Periodical poling requires a deep study of domain kinetics in these crystals. Domain imaging by Cherenkov second harmonic generation microscopy was used to reveal the main processes of domain structure evolution: (1) growth and merging of isolated domains, (2) growth of stripe domains formed on the artificial linear surface defects, and (3) domain shrinkage. In a low field, growth of triangular domains and fast shape recovery after merging were observed, while in a high field, the circular domains grew independently after merging. The revealed essential wall motion anisotropy decreased with the field. The anisotropy led to significant shape transformations during domain shrinkage in low field. The formation of short-lived triangular domains rotated by 180 degrees with respect to the growing isolated domains was observed. The obtained results were explained within the kinetic approach to domain structure evolution based on the analogy between the growth of crystals and ferroelectric domains, taking into account the gradual transition from determined nucleation in low field to the stochastic one in high field. |
| first_indexed | 2024-03-10T18:39:59Z |
| format | Article |
| id | doaj.art-ce683ea0791145628fb1546aac51950a |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T18:39:59Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-ce683ea0791145628fb1546aac51950a2023-11-20T05:58:18ZengMDPI AGCrystals2073-43522020-07-0110758310.3390/cryst10070583In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single CrystalsAndrey Akhmatkhanov0Constantine Plashinnov1Maxim Nebogatikov2Evgenii Milov3Ilya Shnaidshtein4Vladimir Shur5School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, RussiaSchool of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, RussiaSchool of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, RussiaFaculty of Physics, Lomonosov Moscow State University, Moscow 119991, RussiaFaculty of Physics, Lomonosov Moscow State University, Moscow 119991, RussiaSchool of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620000, RussiaLaBGeO<sub>5</sub> (LBGO) crystals are unique ferroelectric materials for manufacturing highly efficient UV laser sources based on frequency conversion. This is due to their low cut-off wavelength, high nonlinear-optical coefficients, and non-hygroscopicity. Periodical poling requires a deep study of domain kinetics in these crystals. Domain imaging by Cherenkov second harmonic generation microscopy was used to reveal the main processes of domain structure evolution: (1) growth and merging of isolated domains, (2) growth of stripe domains formed on the artificial linear surface defects, and (3) domain shrinkage. In a low field, growth of triangular domains and fast shape recovery after merging were observed, while in a high field, the circular domains grew independently after merging. The revealed essential wall motion anisotropy decreased with the field. The anisotropy led to significant shape transformations during domain shrinkage in low field. The formation of short-lived triangular domains rotated by 180 degrees with respect to the growing isolated domains was observed. The obtained results were explained within the kinetic approach to domain structure evolution based on the analogy between the growth of crystals and ferroelectric domains, taking into account the gradual transition from determined nucleation in low field to the stochastic one in high field.https://www.mdpi.com/2073-4352/10/7/583ferroelectricCherenkov second harmonic generationdomain kineticsdomain shapedomain imagingdomain merging |
| spellingShingle | Andrey Akhmatkhanov Constantine Plashinnov Maxim Nebogatikov Evgenii Milov Ilya Shnaidshtein Vladimir Shur In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals Crystals ferroelectric Cherenkov second harmonic generation domain kinetics domain shape domain imaging domain merging |
| title | In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals |
| title_full | In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals |
| title_fullStr | In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals |
| title_full_unstemmed | In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals |
| title_short | In Situ Imaging of Domain Structure Evolution in LaBGeO<sub>5</sub> Single Crystals |
| title_sort | in situ imaging of domain structure evolution in labgeo sub 5 sub single crystals |
| topic | ferroelectric Cherenkov second harmonic generation domain kinetics domain shape domain imaging domain merging |
| url | https://www.mdpi.com/2073-4352/10/7/583 |
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