Sapphire Domes
Hardness and Scratch Resistance: Sapphire is second only to diamond in terms of hardness, making it extremely resistant to scratches and abrasions.
Wide Transmission Range: Sapphire domes offer excellent optical clarity across a broad wavelength spectrum, from UV to MWIR, enabling multi-spectral operations.
Ruggedness: The exceptional toughness of sapphire domes makes them suitable for high-speed applications, providing robust protection in challenging environments.
Applications: Aircraft, Industrial, Missile, Scientific Experiments, etc.
Sapphire domes are protective covers or enclosures made from sapphire (Al2O3) crystal. Sapphire is a hard, scratch-resistant material known for its excellent optical properties, with fine transmission over a wide spectral range extending from UV to MWIR (Mid-Wave Infrared). This makes sapphire domes ideal for various applications where both robustness and high transmittance are essential.
Specifications::
| Transmission Range | 0.15 to 5.5μm |
| Diameter Range | 10~ 380mm |
| Thickness Tolerance | +/-0.2mm (Optional:+/-0.1mm and +/-0.05mm) |
| Surface Quality | 60/40 to 40/20 S/D |
| Chamfer | 0.1~0.3mmx45degree |
| Irregularity (delta N) | customized |
| 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 |
Key Features:
- Hardness and Scratch Resistance: Sapphire is second only to diamond in terms of hardness, making it extremely resistant to scratches and abrasions.
- Wide Transmission Range: Sapphire domes offer excellent optical clarity across a broad wavelength spectrum, from UV to MWIR, enabling multi-spectral operations.
- Ruggedness: The exceptional toughness of sapphire domes makes them suitable for high-speed applications, providing robust protection in challenging environments.
Applications:
- Aircraft: Protecting sensors and other optical components from high-speed impacts, extreme temperatures, and abrasive particles.
- Industrial: Ensuring durable and clear protective barriers for sensors and cameras in harsh industrial environments.
- Missile: Providing robust and transparent protection for missile guidance and detection systems.
- Scientific Experiments: Protecting sensitive equipment in high-pressure chambers and other challenging experimental setups.
