Optical Windows
Zhongding Optical manufactures precision sapphire and fused silica optical windows for demanding industrial, scientific, and medical applications. Every window is polished, inspected, and optionally coated in-house — with full dimensional and optical documentation supplied as standard.
Material Options
💎 Sapphire (Al₂O₃)
Best choice for high-hardness, high-temperature, and broad-spectrum transmission requirements.
- Transmission: 0.15 μm – 5.5 μm (UV to mid-IR)
- Hardness: 9 Mohs
- Max operating temp: 1800°C
- Excellent chemical resistance
- Ideal for: laser windows, sensor covers, IR optics
⬜ Fused Silica (SiO₂)
Preferred for UV applications, large-format windows, and cost-sensitive high-volume projects.
- Transmission: 0.18 μm – 2.5 μm
- Low thermal expansion coefficient
- High laser damage threshold
- Available in large diameters
- Ideal for: UV optics, lithography, laser systems
Standard Geometries
| Shape | Dimensional Range | Thickness Range |
|---|---|---|
| Round (circular) | Ø 3 mm – Ø 200 mm | 0.3 mm – 20 mm |
| Square | 5×5 mm – 150×150 mm | 0.5 mm – 15 mm |
| Rectangle | Custom aspect ratio | 0.5 mm – 15 mm |
| Freeform / Custom profile | Per customer drawing | Per drawing |
Available Coatings
AR — Anti-Reflection
Reflectance R <0.5% per surface. Single-band or broadband. Reduces surface loss and increases transmission.
HR — High Reflection
Reflectance R >99% at specified wavelength. Used as laser cavity mirrors and beam-steering elements.
ITO — Conductive
Transparent conductive film. Used for EMI shielding windows, touchscreen applications, and electrostatic discharge protection.
DLC — Diamond-Like Carbon
Extreme hardness surface film. Used for additional scratch resistance on sapphire covers in high-wear applications.
AF — Anti-Fingerprint
Hydrophobic / oleophobic top coat. Repels skin oils. Reduces cleaning frequency for consumer-facing optical surfaces.
Custom Coating Stack
Multi-layer coating to customer-specified spectral performance curve. Spectrophotometer verification report included.
Standard Optical Window Specifications
| Parameter | Value |
|---|---|
| Dimensional tolerance | ±0.01 mm |
| Flatness | λ/10 @ 633 nm |
| Surface quality | 60-40 standard · 20-10 precision |
| Parallelism | <1 arcmin standard · <10 arcsec precision |
| Clear aperture | >85% of outer dimension |
| Documentation | Dimensional inspection report + CoC + spectrophotometer curve (coated parts) |