Antireflection-coated sapphire window
Sapphire windows retain high strength at elevated temperatures, with good thermal properties and excellent transparency. They resist common acids and alkalis at temperatures up to 1000°C and hydrogen fluoride below 300°C. These properties support use in harsh environments requiring optical transmission from vacuum ultraviolet to near infrared.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Abbe number | 72.24 |
| Birefringence [Visible light orthogonal to the optical axis] | 0.008 |
| Clear Aperture Dimension | ≥90% |
| Coating [General Specifications] | Uncoated |
| Thermal expansion coefficient CTE | 8.8 10-6/℃ |
| Density | 3.97 g/cm 3 |
| Refractive Index | 1.77 |
| Axis direction | Random |
| Parallelism | ≤3.5 arcmin |
| Poisson’s Ratio | 0.27 |
| Material | Sapphire (Al2O3) |
| Surface Flatness | typical:2λ |
| Surface Quality | 80-50 |
| Surface Roughness [Per inch] | 0.1 μm |
| Wavelength Range [General Specifications] | 0.2~5.5 μm |
| Wavelength Range [General Specifications] | 200~5500 nm |
| Young's modulus | 435 GPa |
| Knoop Hardness | 1900 GPa |
| Chemical resistance temperature [Common acids and alkalis] | Up to 1000 |
| Chemical resistance temperature [Hydrogen fluoride] | <300 °C |
| Customizable thickness [As required] | 0.5~50.0 mm |
| Coating [Window configurations available in the precautions; Does not replace the general uncoated specification] | Antireflection (AR) |
Applications
Key Features
Datasheet
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Supplier Information
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