Sapphire window pane
Sapphire window plates have excellent optical transmittance characteristics, high mechanical properties, and can withstand high temperatures. They are highly suitable for use in window panels, such as mobile phone camera Windows, mobile phone panels, watch covers, and smart wearable panels, etc.
Product Details
Sapphire is used as a light guide for immersion infrared spectroscopy acquisition and also for the transmission of 2.94-micron Er:YAG lasers. Sapphire has excellent surface hardness and its transmittance ranges from ultraviolet to mid-infrared wavelengths. Sapphire can only be scratched by a few substances other than itself. The uncoated substrate is chemically inert and insoluble in water, common acids or bases even at a maximum temperature of approximately 1000°C. Our sapphire window has a Z-axis cross-section, so the C-axis of the crystal is parallel to the optical axis, eliminating the birefringence effect of transmitted light.
Sapphire can be divided into coated and uncoated types. Uncoated sapphire is mainly used in applications within the range of 150 nm to 4.5 um, while coated sapphire products have anti-reflective films on both sides and are mainly applied in the wavelength ranges of 1.65 um to 3 um and 2um to 5 um.
| Material | Sapphire |
|---|---|
| Size Range | 3 – 500mm |
| Size Tolerance | ±0.1mm |
| Thickness Tolerance | ±0.1mm |
| Parallelism | < 3′ |
| Clear Aperture | ＞95% |
| Protective Edge Chamfer | 0.1 – 0.5*45° |
| Coating Specification | 1.6 – 3um & 2 – 5um Tave>93% |
| Chemical Composition | AL₂O₃ | Transmission Wavelength Range | 1000nm – 14000nm |
|---|---|---|---|
| Melting Point | 2045°C | Refractive Index | n = 1.769 |
| Density | 3.98 – 4.1g/cm³ | Dielectric Constant | 7.5 – 10 |
| Coefficient of Thermal Expansion (1/°C) | 5.7×10⁻⁶@300K | Resistivity | >10¹⁶Ω(25°C) |
| Specific Heat | 0.18Cal/gm°k(25°C) | Band Gap (ev) | 1.4 |
| Density | 3.98 – 4.1g/cm³ | Young’s Modulus (GPa) | 138.5@298K |
| Mohs Hardness | 9 | Apparent Elastic Limit (Mpa) | 49.46 |
| Elastic Modulus | 340 – 380Gpa | Poisson’s Ratio | 0.31@293K |
| Compressive Strength | 2.1Gpa | Thermal Conductivity (j/k.m.s) | 55@300K |
| Tensile Strength | 0.19Gpa | Heat Capacity (j/g.k) | 0.32 |
| Absorption Coefficient | 0.01@2500nm – 11000nm | Thermo – optic Coefficient dn/dT(1/°C) | 160 – 120×10⁻⁶@3000nm – 12000nm |
| Chemical Properties | Not corroded by acid – base at room temperature; Can be eroded by HF hydrofluoric acid at 300°C |
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