YAG (undoped)
Pure yttrium aluminium garnet provides an interesting alternative to sapphire for UV optics, IR optics and refractometry
Key characteristics
Undoped YAG grown in CRYTUR is unique by its
- Excellent chemical purity (99,995%)
- Transparency from UV to IR spectral range
- Excellent optical quality
- Very low internal stress
All of these properties have been developed to high level as a part of CRYTUR’s development of YAG-based scintillators and laser elements.
Other key characteristics of YAG are
- No birefringence
- High index of refraction
- High hardness and durability
- High heat and chemical resistance
Technical parameters
| Physical properties | |
|---|---|
| Crystallographic structure | cubic |
| Density | 4.554 g/cm3 |
| Elastic modulus | 280 kg/mm2 |
| Hardness by Mohs | 8 - 8.5 |
| Hardness by Knoop | 1350 kg/mm2 |
| Thermal properties | |
|---|---|
| Melting point | 1921°C (2193°K) |
| Thermal conductivity | 13.4 W/m.K @ 300 K |
| Thermal expansion | 7.7 ppm/K |
| Optical properties | |
|---|---|
| Appearance | transparent, colorless |
| Transparency range | 210 nm - 5200 nm |
| Index of refraction |
1.84 at 486 nm |
Graphs
