YAG
Undoped YAG Crystal is an excellent material for UV-IR optical windows, particularly for high temperature and high energy density applications. The mechanical and chemical stability is comparable to sapphire crystal, but YAG is unique with non-birefringence and available with higher optical homogeneity and surface quality. Up to 3 YAG boule grown by CZ method, as-cut blocks, windows and mirrors are available
Specifications:
| Orientation: | < 111 > +/-5deg |
| Diameter Tolerance : | +0.0 /-0.1mm |
| Thickness Tolerance: | +/-0.2mm |
| Surface Quality: | better than 10/5 scratch/dig |
| Parallelism: | < 30 arcsec |
| Flatness: | < l/8 @632.8nm |
| Perpendicularity: | < 5 arcmin |
| Wavefront Distortion: | < l/2 @632.8nm |
| Coating: | Coating upon Request |
Properties:
| Crystal Structure | Cubic |
| Density | 4.5 g/cm3 |
| Transmission Range | 250 - 5000 nm |
| 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 | 6.9x10-6 /K |
| dn/dT, @ 633nm | 7.3x10-6 /K-1 |
| Mohs Hardness | ~ 8.5 |
| Refractive Index | 1.8245 @ 0.8mm, 1.8197 @ 1.0mm, 1.8121 @ 1.4mm |