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Magnesium Fluoride Dome.
Magnesium fluoride dome is a spherical cover made of MgF₂ material. Coligh manufactures <500mm MgF₂ domes including hemispherical domes, hyper-hemispherical domes, and clipped dome
It has the following features:
- Processing size: diameter within 500 mm
- Available with various coating options
- Excellent transmittance in the 0.12–7.5 µm wavelength range
- Mohs hardness of approximately 5-6, scratch-resistant
- Good resistance to acids, alkalis, and salt fog
- Refractive index of approximately 1.38 (at 0.55 µm)
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Magnesium Fluoride Multispectral Optical Dome Description
The magnesium fluoride (MgF₂) dome provided by Coligh is a high-performance optical element with high transmittance from deep ultraviolet 0.12um to 7.5um, covering the ultraviolet band, visible light band and infrared band.
- Because of its chemical inertness, it has strong tolerance to corrosive media such as acid, alkali, salt spray, etc., and is very suitable for harsh environments, such as marine, chemical and aerospace fields, and can extend the service life in humid or corrosive environments.
- In addition, it has strong mechanical stability, Mohs hardness 5-6, higher than ordinary glass (about 5), and can resist sand and dust scratches and mechanical impact.
- Low refractive index: about 1.38 (@0.55 µm), effectively reducing surface reflection loss, and achieving high transmission without complex coating.
Coligh has large-size processing capabilities.
- We support customized domes with a diameter of 500mm, and can provide different types of domes, such as magnesium fluoride crown, magnesium fluoride hemispherical dome, magnesium fluoride super hemispherical dome, cut dome, etc., which can meet the needs of large optical systems such as satellite remote sensing lenses and infrared imaging systems.
- We provide a variety of coating options, such as anti-reflection film, waterproof film and other film layers. After coating, the transmittance of key bands reaches more than 99%.
Magnesium Fluoride Multispectral Optical Dome Detail Display
Magnesium Fluoride Dome Technical Datasheet
| Coligh MgF₂ dome Custom Datasheet Option | |
| Material | MgF₂ dome |
| Custom Sapphire Dome | MgF2 spherical crown, MgF hemispherical dome, Ω-type ultra-hemispherical dome, cut dome |
| Optional Materials | magnesium fluoride, Sapphire, zinc sulfide, other glass |
| Size | Customizable, diameter ≤ 500mm, any size |
| Shape | Any shapes |
| Concentricity | 0.05 mm |
| Surface Quality | 10/20 |
| Coating Type | Anti-reflection thin film, high reflection thin film, metal thin film beam splitter thin film, cut-off thin film |
| Transmittance | ≥ 99% (120nm – 7500nm) |
| Hardness | Mohs hardness 5-6 |
| Refractive Index | 1.35 (@0.55 µm) |
| Corrosion Resistance | acid, alkali, salt spray |
| Tolerance Range | Diameter tolerance ±0.01mm, thickness tolerance ±0.02mm |
Magnesium Fluoride Optical Dome Applications
Magnesium fluoride optical dome has in-depth applications in cutting-edge technology and industrial scenarios, such as:
- In industrial manufacturing, it is used in semiconductor lithography machines and DUV laser transmission windows to reduce errors caused by thermal lens effects
- In the energy field, by plating a metal transition layer on the inner wall of the dome, vacuum brazing of the dome and the titanium alloy body can be achieved, thereby achieving high pressure resistance and H₂S acid gas corrosion resistance
- In the civilian field, magnesium fluoride optical dome can be used as a protective cover for ultra-high-speed cameras, astronomical telescopes, and lidar cars
- Hundreds of micro MgF₂ hemispheres (diameter 0.5-2 mm) are arranged into a curved array, and each unit is independently imaged. In addition, the magnesium fluoride dome can also be used as an observation window for deep-sea manned submersibles, which can withstand the pressure of a 10,000-meter trench.
