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Optical Sapphire Windows
Sapphire windows are high-transmittance optical windows covering 150nm–5um. Coligh produces sapphire windows with large diameters <1000mm and various shapes for aerospace and infrared optics.
The sapphire windows produced by Coligh have the following characteristics:
- High transmittance in the ultraviolet, visible light, and infrared bands of 150nm-5um
- Mohs hardness reaches 9
- Melting point is as high as 2050℃
- <1000mm Ultra-large diameter manufacturing capacity
- Supports circular, square, polygonal and any special-shaped contour design
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Optical Sapphire Windows Description
Coligh sapphire windows are made of high-quality single crystal sapphire (α-Al₂O₃), combined with advanced crystal growth and precision processing technology, and are designed for harsh optical environments.
Core advantages and features:
- Full-band high light transmittance Spectral range covers 150nm (deep ultraviolet) to 6μm (mid-infrared), transmittance>85% (visible light band>90%), meeting the needs of multi-spectral system integration.
- Mohs hardness level 9, scratch resistance far exceeds glass, quartz and other materials, suitable for industrial environments with frequent dust and friction.
- Melting point 2050℃, can work stably for a long time below 1800℃ (nitrogen/inert gas environment), without thermal deformation or performance degradation.
- We provide flexible customized design for size and shape. It can be processed into round, square, polygonal and complex special-shaped structures, which can match the non-standard space design of medical endoscopes and military telescopes.
- Supports ultra-large specifications with a diameter of <1000mm (far exceeding the industry standard of 500mm), and supports integrated optical design of equipment such as astronomical telescopes and large lasers.
- We can also provide multi-functional processing, including but not limited to precision drilling, grooving, surface coating (anti-reflection film, filter film, etc.), engraving, polishing and other secondary processing services to meet special installation requirements.
- High-precision optical performance: Surface accuracy: RMS full aperture 13/60nm, parallel error 0.25”, surface quality 10/20
- Thin film Coating: Optional multi-layer broadband anti-reflection film, the transmittance of specific bands is increased to more than 99%.
Optical Sapphire Windows Detail Display
Optical Sapphire Windows Technical Datasheet
| Parameter | Specification |
| Standard Size | Φ1mm – Φ1000mm (Customizable) |
| Material | Single Crystal Sapphire (C-plane/Z-axis) / C-axis |
| Transmission Range | 150nm – 5μm |
| Mohs Hardness | 9 |
| Thermal Expansion Coefficient | 5.3×10⁻⁶/K (@25-500℃) |
| Thermal Conductivity | 25-35 W/(m·K) |
| Surface Quality | 10/20 |
| Parallelism | 0.25” |
| RMS | Full Aperture 13/60nm |
| Processing Techniques | Grinding, Polishing, Edge Grinding, Chamfering, Drilling, Custom Shapes |
| Surface Treatment | Double-Sided Optical Polishing / Coating |
Optical Sapphire Windows Applications
Sapphire is an ideal choice for high-end optical window materials. It is mainly used in the following areas:
Military and aerospace
- The high transmittance of sapphire windows in the 3-5μm mid-infrared band makes it the core window material for infrared imaging systems. It can withstand aerodynamic thermal shock >1000℃ in supersonic flight.
- In addition, its Mohs hardness is 9, which is lower than the particle impact in high-speed airflow, and is suitable for marine environments such as carrier-based aircraft.
- In addition, its radiation resistance can also ensure the imaging accuracy of space telescopes and other equipment under extreme temperature differences.
Industry and scientific research
- Sapphire windows have always been the output windows of CO₂ lasers (10.6μm) and ultraviolet laser processing equipment. It can also be used for ultra-high pressure observation windows and semiconductor manufacturing.
- As a window for etching and CVD equipment, it can ensure the stability of process monitoring.
Medical and biotechnology
- In laser medical equipment and endoscopic imaging, sapphire windows can maintain long-term stability and support 4K resolution transmission
In special environment sensing
- such as oil exploration, nuclear industry, deep-sea exploration, etc., it can be used as a protective window and observation window for sensors, supporting multi-spectral imaging
