Custom Sapphire Optical Window 222mm×74mm×4mm Wear Resistance for Infrared windows
Blue Sapphire Optical Windows are primarily fabricated from optical-grade sapphire (α-Al₂O₃ single crystal). Here, "sapphire" refers not to natural gemstones but to high-purity, single-crystal aluminum oxide (Al₂O₃). Renowned for its exceptional hardness (Mohs hardness of 9, second only to diamond), outstanding wear resistance, thermal stability (melting point ~2030–2050°C), chemical inertness, and broad spectral transmission (0.2 μm–5.5 μm), sapphire is an indispensable material for extreme-environment optical applications.
A "window" typically refers to a flat, transparent plate that protects sensitive optical systems (e.g., sensors, lasers, detectors) from environmental hazards such as dust, scratches, chemical corrosion, or high-temperature/high-pressure conditions while maintaining superior optical transmission.
Sapphire Optical Window Features
1.Ultra-High Hardness & Wear Resistance
- Mohs hardness of 9, enabling resistance to scratches and abrasion in abrasive or mechanically demanding environments.
2.Broad Spectral Transmission
- High transmittance across UV (170–330 nm), visible (330–700 nm), and mid-IR (up to 5.5 μm) wavelengths, with minimal temperature-dependent infrared transmission loss.
3.Extreme Thermal Stability
- Withstands temperatures exceeding 1900°C (melting point: 2030–2050°C) without structural degradation, ideal for high-temperature applications.
4.Chemical Inertness
- Resists corrosion by water, most acids, and alkalis, suitable for harsh chemical environments.
5.Mechanical Robustness
- 5× stronger than glass, capable of enduring high mechanical stress and impacts.
Sapphire Optical Window Applications
1. Semiconductor Manufacturing
- High-temperature furnace windows, observation ports requiring chemical resistance and thermal stability.
2. Optical Instruments
- IR/UV windows, laser protective windows, spectrometer apertures, barcode scanner optics.
3. Industrial Sensing
- High-pressure reactor viewports, flowmeter measurement windows, sensor protective covers.
4.Scientific Research & Defense
- High-voltage chamber optics, synchrotron beamlines, aerospace FLIR systems.
5.Consumer Electronics
- Watch crystals, smartphone camera protective lenses.
Sapphire Optical Window Data
| Parameter Name | Typical Value/Range |
| Material | Optical-grade Sapphire Single Crystal (α-Al₂O₃) |
| Size | 222mm×74mm×4mm |
| Thickness Tolerance | ±0.1 mm |
| Clear Aperture | >90% |
| Surface Roughness (Ra) | ≤0.2 nm |
| Transmission Range | 170–5500 nm |
| Thermal Expansion Coefficient | 8.8 × 10⁻⁶/°C |
| Refractive Index | 1.773 |
| Elastic modulus | 435 GPa |
More samples of Sapphire Optical Window
*We accept customized one, please feel free to contact us about your requirements.
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1. Q: Where are sapphire optical windows commonly used?
A: Sapphire optical windows are widely used in high-temperature environments (e.g., industrial furnaces), laser systems, defense equipment (FLIR systems), and aerospace instrumentation due to their extreme durability and thermal stability.
2. Q: What makes sapphire windows better than glass?
A: Sapphire offers superior hardness (Mohs 9), chemical inertness, thermal resistance up to 2030°C, and broad transmission (UV to mid-IR), making it ideal for harsh applications where glass would degrade.
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