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 |
| Fringes (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 |
Both high transmission, as well as reliable durabilities, are important for optical domes, Sapphire Domes are an excellent option for its good mechanical properties and good transmission from UV to MWIR of 3-5μm. The wide transmissive spectrum of sapphire domes makes them ideal for multi-spectral and high-speed usages.
Hangzhou Shalom EO offers custom sapphire domes with wide wavelengths from UV to MWIR, the products are used in extensive for defense and aerospace applications.
Curves:
1. Transmission of Sapphire at Infrared Wavelength Range (no coating)
2. Transmission of Sapphire at UV Wavelength Range ( no coating)
