Undoped YAG (Yttrium Aluminum Garnet)
Applications
Alternative to Sapphire as an optical material
Advantages
- Very low absorption in the 2-3 micron range
- Much easier to polish than Sapphire
- Does not exhibit birefringence like Sapphire
- Extremely durable
| Ordering Options and Specifications | |
| AR Coating Reflectivity | <0.25% at specified l |
| Wavefront Distortion | < l/2 |
| Diameter Tolerance | +0.000" / -0.002" |
| Length Tolerance | +0.040" / -0.000" |
| Flatness | < l/10 at 633nm |
| Surface Quality (per MIL-O-13830A) |
10-5 |
| Damage Threshold | >15 J/cm2 |
| Material Properties | |
| Formula | Y3Al5O12 |
| Crystal Structure | Cubic [111] |
| Moh Hardness | 8-8.5 |
| Melting Point | 1950°C |
| Density | 4.55 g/cm3 |
| Thermal Conductivity | 0.14 W/ cm°C |
| dn/dt | 7.4 x 10-6 o C-1 |
| Thermal Expansion | 6.9 x 10-6 o C-1 |
| Index of Refraction at 0.8 mm at 0.9 mm at 1.0 mm at 1.2 mm at 1.4 mm |
1.8245 1.8222 1.8197 1.8152 1.8121 |