ZnSe Optical Window Explained | CO2 Laser Protective Optics
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- Felix Glass Co., Limited
- Issue Time
- Oct 10,2026
Summary
Learn about laser-grade ZnSe optical windows for CO2 lasers, transmission features, AR coatings, laser damage threshold and maintenance tips.
ZnSe Optical Window Explained
Zinc Selenide (ZnSe) is the most widely used infrared optical material for industrial CO₂ laser systems at 10.6 μm. ZnSe optical windows act as protective barriers, blocking smoke, debris and spatter while maintaining high transmittance for the infrared laser beam.
Key Optical & Physical Properties of ZnSe Windows
| Parameter | Specification & Notes |
|---|---|
| Transmission Range | 0.6 μm ~ 18 μm, optimized for 10.6 μm CO₂ laser |
| Refractive Index @10.6μm | ~2.40 |
| Recommended Coating | AR coating @10.6 μm for >99% transmission |
| Hardness | Soft and scratch-sensitive; requires careful handling |
| Laser Damage Threshold | High for continuous-wave CO₂ laser; avoid surface contamination |
Available Coating Options
- Single-band AR coating for 10.6 μm CO₂ laser (standard choice)
- Dual-band AR coating for 10.6 μm IR + visible red alignment beam
- High-power AR coating for high wattage continuous CO₂ laser machines
Common Failure Causes & Maintenance Tips
- Surface scratches: caused by improper wiping, dirty cloth or hard particles
- Burn spots: contamination from smoke, oil or spatter on the coating surface
- Cleanness rule: only use optical-grade lens paper and isopropyl alcohol for cleaning
- Store ZnSe windows in dry environment; avoid long-term exposure to humid air
Typical Applications
- CO₂ laser cutting machines, laser engravers and laser markers
- Industrial non-metal processing: acrylic, wood, leather, rubber and fabric
- Infrared thermal imaging and FTIR spectroscopy systems
- Laser beam delivery protective optics for OEM laser equipment
Machining Capacity & Quality Control
Felix Glass supplies laser-grade ZnSe optical windows with scratch-dig up to 20/10. We support custom diameter, thickness, plano-plano geometry and precision AR coating. Custom drawings, sampling and bulk orders are accepted.
Datasheet & Custom Inquiry
Send your dimension, laser power and coating requirement for quotation of ZnSe optical windows.
Request Datasheet & Custom Quote