Sapphire Windows
Single Crystal Sapphire Optical Windows
Single crystal sapphire is the second hardest natural material after diamond (Mohs hardness 9), featuring extreme mechanical strength, broad transmission (UV to mid-infrared: 200nm–5500nm), excellent thermal stability, and chemical resistance. Widely used as optical protection windows in harsh environments.
Specifications
| Parameter | Value |
|---|---|
| Material | Single Crystal Sapphire (Al₂O₃) |
| Transmission Range | 200nm–5500nm |
| Refractive Index (n) | no=1.755, ne=1.747 @ 1064nm |
| Mohs Hardness | 9 (second only to diamond) |
| CTE | 5.3×10⁻⁶/°C (a-axis) |
| Melting Point | 2053°C |
| Diameter Range | Ø1mm–Ø300mm |
| Surface Quality | 40-20 / 20-10 available |
| Orientation | C-plane / A-plane / R-plane etc. |
Coating Services
- AR Single-wavelength — R < 0.5% at specified wavelength (UV to mid-IR range)
- AR Broadband — For wide spectral range applications; specify wavelength range
- Note: sapphire's high refractive index (n≈1.76) means ~8% Fresnel loss per surface uncoated; AR coating strongly recommended for precision applications
- DLC (Diamond-Like Carbon) coating available on request for added abrasion resistance in extreme environments
Typical Applications
High-Temp / High-Pressure WindowsMilitary & Aerospace WindowsMedical EndoscopesDeep-Sea EquipmentHigh-Power Laser Systems