Crystal growth, measurement and modeling of the optical activity of $α$-GeO$_2$. Comparison with $α$-SiO$_2$
Fuente:
arXiv
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915114256433152 |
|---|---|
| author | Pena, Alexandra Felix, Corinne Menaert, Bertrand Boulanger, Benoit |
| author_facet | Pena, Alexandra Felix, Corinne Menaert, Bertrand Boulanger, Benoit |
| contents | This work aimed first at growing high quality bulk $α$-GeO$_2$ crystals in their Quartz iso-structural form ($α$-SiO$_2$), using a high temperature flux method. By optimizing the flux composition and the geometry and orientation of the seeds, it has been possible to achieve growth yields up to 90 % leading for the first time to bulk single crystals up to 3.5 cm$^3$. Thanks to the optical quality and size of the obtained crystals, the second step of this study was the measurement of the optical activity of $α$-GeO$_2$ between 0.3 and 2 $μ$m. This gave access to the value of one of the independent components of the gyration tensor (g33) as a function of the wavelength. An $α$-SiO$_2$ slab have been used to validate our methodology. Both crystals show a magnitude of optical activity of 3.4x10$^{-5}$ rad/$μ$m in the near IR range and great variations where the higher values are 3.4x10$^{-3}$ rad/$μ$m and 1.7x10$^{-3}$ rad/$μ$m at 0.3 $μ$m for $α$-GeO$_2$ and $α$-SiO$_2$, respectively. The measurements are perfectly described by an empirical model that we propose and which relies on the macroscopic first-order electrical susceptibility and on the pitch of the structural helix compared to the wavelength of light. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_12496 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Crystal growth, measurement and modeling of the optical activity of $α$-GeO$_2$. Comparison with $α$-SiO$_2$ Pena, Alexandra Felix, Corinne Menaert, Bertrand Boulanger, Benoit Optics This work aimed first at growing high quality bulk $α$-GeO$_2$ crystals in their Quartz iso-structural form ($α$-SiO$_2$), using a high temperature flux method. By optimizing the flux composition and the geometry and orientation of the seeds, it has been possible to achieve growth yields up to 90 % leading for the first time to bulk single crystals up to 3.5 cm$^3$. Thanks to the optical quality and size of the obtained crystals, the second step of this study was the measurement of the optical activity of $α$-GeO$_2$ between 0.3 and 2 $μ$m. This gave access to the value of one of the independent components of the gyration tensor (g33) as a function of the wavelength. An $α$-SiO$_2$ slab have been used to validate our methodology. Both crystals show a magnitude of optical activity of 3.4x10$^{-5}$ rad/$μ$m in the near IR range and great variations where the higher values are 3.4x10$^{-3}$ rad/$μ$m and 1.7x10$^{-3}$ rad/$μ$m at 0.3 $μ$m for $α$-GeO$_2$ and $α$-SiO$_2$, respectively. The measurements are perfectly described by an empirical model that we propose and which relies on the macroscopic first-order electrical susceptibility and on the pitch of the structural helix compared to the wavelength of light. |
| title | Crystal growth, measurement and modeling of the optical activity of $α$-GeO$_2$. Comparison with $α$-SiO$_2$ |
| topic | Optics |
| url | https://arxiv.org/abs/2501.12496 |