ECOPTIK provides a variety of sapphire optical component, such as sapphire lens, sapphire window, sapphire mirror, sapphire cylindrical lens, sapphire prism, sapphire light guide, sapphire dome and so on.
Sapphire (Single crystal Al2O3) is a commonly used optical material, mainly based on its several characteristics.
Ultra-long applicable wavelength band: it can transmit from ultraviolet (UV=150nm) wavelength to mid-infrared (IR=5um) wavelength, and has high transmittance
Excellent physical properties: including strength, high hardness, high temperature resistance, friction resistance, and corrosion resistance.
Stable chemical properties, such as not being corroded by acids and alkalis.
Crystallographic | Syngony | Tetragon |
Symmetry Class | 3m | |
Lattice Constants | a = 4.758 Å c = 12.991 Å | |
Cleavability | (1011), (1120) imperfect | |
Optical | Refractive Index at ne | 1.7771 |
Refractive Index at nF' - nC' | 0.0107 | |
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C | βo = (0.88 ... 1.28) x 10-5 βe = (0.99 ... 1.39) x 10-5 | |
Spectral Range, microns | 0.17 - 5.0 | |
Thermal | Thermal Linear Expansion, °C-1 for ±60 °C | |
⊥ to c-axis | (3.24 ... 5.66) x 10-6 | |
Thermal Conductivity, W/(m * °C) at 46 °C | ||
⊥ to c-axis | 25.2 | |
|| to c-axis | 23.1 | |
Specific Heat Capacity, J/(kg * °C) | 0.7610 x 103 | |
Thermal Stability, °C | 162 ±8 | |
Melting Point, °C | 2030 | |
Chemical | Molecular Weight | 101.96 |
Solubility in water, gram/100 cm3 | 98 x 1010 | |
Wavelength, Microns | Refractive Index no | Refractive Index ne |
1.0 | 1.7545 | 1.7460 |
2.0 | 1.7374 | 1.7299 |
3.0 | 1.7015 | 1.6920 |
4.0 | 1.6748 | 1.6679 |
Wavelength, Microns | Internal Transmittance |
0.2 | 0.79 |
0.5 | 0.97 |
1.0 | 0.97 |
3.0 | 0.97 |
5.0 | 0.45 |
Widely used in infrared and far-infrared military equipment, such as: used in night vision infrared and far-infrared sights, night vision cameras and other instruments and satellites, space technology instruments and meters, as well as windows for high-power lasers, various Optical prisms, optical windows, UV and IR windows and lenses, and observation ports for low-temperature experiments are fully used in high-precision instruments and meters for navigation, aerospace, and aviation.
Commercial grade | Precision grade | High precision grade | |
Diameter | 1-300mm | ||
Diameter tolerance | ±0.1mm | ±0.05mm | ±0.01mm |
Thickness tolerance | +0/-0.1mm | ±0.05mm | ±0.01mm |
Parallelism | <3 arc min | <30 arc sec | <5 arc sec |
Surface quality: | 60/40 | 40/20 | 20/10 |
Surface accuracy | λ | λ/4 | λ/10 |
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