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 | 0.15 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 |
Sapphire Domes are protective covers or enclosures made from sapphire (Al2O3) crystal. Sapphire is a hard and scratch-resistant material that offers excellent optical properties with its fine transmission over a wide range extending from UV to MWIR spectral region, making it suitable for various applications where robustness and transmittance are essential. The wide transmission wavelength range of sapphire domes caters to multi-spectral operation and their incomparable ruggedness excels in high-speed context.
Shanghai North Optics offers custom sapphire domes. Our sapphire domes are optimized for utilization in aircraft, Industrial, missile, and scientific experiment applications to be incorporated into sensors, IR cameras, high-pressure chambers, etc. providing protection against high-speed impacts, extreme temperatures, and abrasive particles encountered while maintaining a transparent and robust barrier. Overall, our sapphire domes offer superior performance due to their exceptional hardness, optical clarity, and resistance to scratches, abrasion, and harsh environmental conditions.
Curves:
1. Transmission of Sapphire at Infrared Wavelength Range (no coating)
2. Transmission of Sapphire at UV Wavelength Range ( no coating)
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