Skip to content 
Sapphire Dome
A sapphire dome is a transparent protective window cover made of sapphire. Coligh manufactures various types of sapphire domes, such as domed crowns, hemispheres, super hemispheres, and cut-out domes.
- Feature exceptionally high Mohs hardness
- Strong impact resistance
- Over 99% transmittance
- Excellent corrosion and high-temperature resistance.
Large Diameter Sapphire Dome Sapphire Dome Description
Coligh specializes in producing various sapphire domes. Our sapphire domes have an ultra-high hardness of 9 on the Mohs scale. Through precision crystal directional growth technology, we have increased the impact strength to 5-8 times that of ordinary glass. It can withstand accidental drops or severe vibrations and reduce the cost of frequent replacement. In addition, the transmittance is >= 99%, so that the light can penetrate with almost no loss, avoiding dispersion or distortion. In addition, the sapphire dome can withstand extreme temperature differences from -50℃ to 800℃, and can maintain long-term performance stability in marine and chemical corrosive environments. We can also coat sapphire according to customer needs.
Sapphire Dome Detail Display
Sapphire Optical Dome Technical Datasheet
| Coligh Sapphire Custom Option | |
| Material | Sapphire (Sapphire) |
| Custom Sapphire Domes | Sapphire spherical crown, sapphire hemispherical dome, Ω-type ultra-hemispherical dome, notched dome |
| Optional Materials | Sapphire, zinc sulfide, magnesium fluoride, other glass |
| Size | Customizable, diameter ≤ 500mm, any size |
| Shape | Any shapes |
| Concentricity | 0.05 mm |
| Surface Quality | 10/20 |
| Coating Type | Anti-reflective, multi-layer enhancement |
| Transmittance | ≥ 99% (400nm – 5000nm) |
| Hardness | Mohs hardness 9 |
| Refractive Index | 1.76-1.78 |
| Corrosion Resistance | Acid and alkali resistant, strong oxidation resistance |
| Tolerance Range | Diameter tolerance ±0.01mm, thickness tolerance ±0.02mm |
Sapphire Window Dome Applications
Sapphire domes have a wide range of applications, such as:
- Underwater and deep-sea exploration Because sapphire domes have the characteristics of high pressure resistance, corrosion resistance and full-angle vision, they can be used in underwater detectors, underwater robots, diving cameras, etc.
- In laser radar, infrared thermal imagers, and satellite sensors, sapphire domes can avoid signal interference in strong light environments and reduce light refraction distortion to ensure data accuracy
- In military and aerospace, sapphire domes are usually used in drone reconnaissance lenses and spacecraft portholes because of their impact resistance and temperature resistance.
- Because sapphire is resistant to corrosion and high temperature, it is also used in industrial endoscopes, oil and gas pipeline inspection robots, fuel cell observation ports and other equipment
