Terbium Gallium Garnet
| Terbium Gallium Garnet | |
| chemical formula | Tb 3 Ga 5 O 12 |
| Mineral grade | grenade |
| Crystal system | cubic |
| Lattice constant | 1235 pm |
| hardness | 8th |
| density | 7.13 · 10 3 kg / m 3 |
| Melting point | 1725 ° C |
| Crystal optics | |
| Refractive index | 1.98 at 600 nm 1.95 at 1064 nm |
| Birefringence | no |
| Verdet constant | 134 rad T −1 m −1 at 632 nm. |
Terbium gallium garnet , abbreviated TGG , is a crystalline material with a high Verdet constant in the range of visible light and in the near infrared. This makes it particularly suitable for the manufacture of Faraday isolators .
The chemical composition of TGG is Tb 3 Ga 5 O 12 . TGG crystals are produced by pulling them from the melt. The Czochralski method is usually used .
Web links
- U. Schlarb, B. Sugg: Refractive Index of Terbium Gallium Garnet. In: physica status solidi. 182, 1994, p. K91, doi : 10.1002 / pssb.2221820238 .
- H. Dachraoui, RA Rupp, K. Lengyel, MA Ellabban, M. Fally, G. Corradi, L. Kovács, L. Ackermann: Photochromism of doped terbium gallium garnet. In: Physical Review B. 74, 2006, doi : 10.1103 / PhysRevB.74.144104 .
Individual evidence
- ↑ Data sheet ( memento of July 18, 2018 in the Internet Archive ) from Northrop Grumman with the properties of TGG