Laser protective windows are essential components in high-power laser systems, serving as a barrier between the laser source and the processing environment while maintaining excellent optical performance. They are widely used in laser cutting, welding, and marking, where resistance to heat, plasma, and high laser intensity is critical.
At SOT, our laser windows are manufactured from high-quality optical materials and advanced coatings to deliver high transmission, low wavefront distortion, and superior thermal stability. They are optimized for common industrial laser wavelengths, including 1070 nm (fiber/YAG lasers) and 10.6 µm (CO₂ lasers). Precision polishing and coating processes ensure stable performance and long service life, even in harsh industrial environments.
Key Features
- High Transmission – Maximized light throughput with minimal optical loss
- High Damage Threshold – Designed for high-power laser operation
- Excellent Thermal Stability – Reliable performance under fluctuating thermal conditions
- Low Wavefront Distortion – Preserves beam quality and processing accuracy
- Industrial Versatility – Ideal for cutting, welding, and marking systems
Spectrum Transmission
Standard transmission curves are available for common wavelengths. If standard configurations do not meet your requirements, custom spectral designs can be provided based on wavelength, size, substrate, and application-specific parameters.
Coating Quality & Environmental Reliability
All laser windows undergo rigorous testing in accordance with military and industrial standards:
- Adhesion Test (MIL-C-675C) – No peeling or blistering after repeated tape removal
- Thermal Cycling Test – −62°C to +71°C with no coating degradation
- Abrasion Resistance (MIL-C-675C / CCC-C-440) – No surface damage after 25 cycles
- Humidity Test – 95–100% RH at 49°C for 24 hours with no defects
- Solvent Resistance – Acetone and alcohol exposure without peeling or scratches
- Salt Spray Test – 100 hours at 35°C, 5% salt concentration with no damage
Standard Specifications
- Material Options: JGS1, ZnSe
- Diameter Tolerance: +0 / −0.1 mm
- Thickness Tolerance: ±0.05 mm
- Surface Quality: 40-20
- Parallelism: ≤ 3′
Coating Options
- 1070 nm: R < 0.2% @ 1060–1080 nm
- 10.6 µm: Custom AR coatings available upon request
Typical Applications
- Laser Cutting – High-power transmission with optical protection
- Laser Welding – Shields optics from heat, spatter, and plasma
- Laser Marking & Engraving – Stable beam quality for consistent results
- CO₂ Laser Systems – Optimized for high-power 10.6 µm transmission
- YAG / Fiber Laser Systems – Designed for durability and precision at 1070 nm
Standard Products
| Product | Material | Wavelength | Transmission | Sizes |
|---|---|---|---|---|
| Protective Window 1070 nm | JGS1 | 1070 nm | 85% | D22.4×4.1, D25.4×4, D30×3 |
| Protective Window 10.6 µm | ZnSe | 10.6 µm | 90% | D50×2, D50×3, D134×3 |
Additional sizes and specifications available upon request.