Undoped Yttrium Aluminium Garnet (Y3Al5O12 or YAG) is a new substrate and optical material that can be used for both UV and IR optics. It is particularly useful for high-temperature and high-energy applications. The mechanical and chemical stability of YAG is similar to that of Sapphire.
Advantages of Undoped YAG:
• High thermal conductivity, 10 times better than glasses
• Extremely hard and durable
• Non-birefringence
• Stable mechanical and chemical properties
• High bulk damage threshold
• High index of refraction, facilitating low aberration lens design
Features:
• Transmission in 0.25-5.0 mm, no absorption in 2-3 mm
• High thermal conductivity
• High index of refraction and Non-birefringence
Basic properties:
| Product Name | Undoped YAG |
| Crystal structure | Cubic |
| Density | 4.5g/cm3 |
| Transmission Range | 250-5000nm |
| Melting Point | 1970°C |
| Specific Heat | 0.59 W.s/g/K |
| Thermal Conductivity | 14 W/m/K |
| Thermal Shock Resistance | 790 W/m |
| Thermal Expansion | 6.9×10-6/K |
| dn/dt, @633nm | 7.3×10-6/K-1 |
| Mohs Hardness | 8.5 |
| Refractive Index | 1.8245 @0.8mm, 1.8197 @1.0mm, 1.8121 @1.4mm |
Technical Parameters:
| Orientation | [111] within 5° |
| Diameter | +/-0.1mm |
| Thickness | +/-0.2mm |
| Flatness | l/8@633nm |
| Parallelism | ≤ 30″ |
| Perpendicularity | ≤ 5 ′ |
| Scratch-Dig | 10-5 per MIL-O-1383A |
| Wavefront Distortion | better than l/2 per inch@1064nm |