Specifications:
| Materials | Optical grade sapphire crystals (Al2O3) | Diameter Range | 10~ 380mm |
| Thickness Tolerance | +/-0.2mm (Optional:+/-0.1mm and +/-0.05mm) | Surface Quality | 60/40 to 40/20 S/D |
| Frings (N) | customized | Irregularity (delta N) | customized |
| Chamfer | 0.1~0.3mmx45degree |
Physical and Optical Properties:
| Transmission Range | 0.17 to 5.5μm | Refractive Index | No 1.75449; Ne 1.74663 at 1.06μm (1) |
| Reflection Loss | 14% at 1.06μm | Absorption Coefficient | 0.3 x 10-3 cm-1 at 2.4μm (2) |
| Reststrahlen Peak | 13.5μm | dn/dT | 13.1 x 10-6 at 0.546μm (3) |
| dn/dμ = 0 | 1.5μm | Density | 3.97 g/cc |
| Melting Point | 2040°C | Thermal Conductivity | 27.21 W m-1 K-1 at 300K |
| Thermal Expansion | 5.6 (para) & 5.0 (perp) x 10-6 /K * | Hardness | Knoop 2000 with 2000gindenter |
| Specific Heat Capacity | 763 J Kg-1 K-1 at 293K (4) | Dielectric Constant | 11.5 (para) 9.4 (perp) at 1MHz |
| Youngs Modulus (E) | 335 GPa | Shear Modulus (G) | 148.1 GPa |
| Bulk Modulus (K) | 240 GPa | Elastic Coefficients | C11=496 C12=164 C13=115 C33=498 C44=148 |
| Apparent Elastic Limit | 300 MPa (45,000 psi) | Poisson Ratio | 0.25 |
| Solubility | 98 x 10-6 g/100g water | Molecular Weight | 101.96 |
| Class/Structure | Trigonal (hex), R3c |
Domes need both high transmission as well as durability, sapphire is a excellent selection for its good mechanical properties and good transmission from UV to MWIR of 3-5μm, it is suitable for multi-spectral and high-speed applications. Hangzhou Shalom EO provide the sapphire domes with wide wavelength from UV to MWIR, they are widely used in defense, security and aerospace applications.
Curves:
1. Transmission of Sapphire at Infrared Wavelength Range (no coating)
2. Transmission of Sapphire at UV Wavelength Range ( no coating)
