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3000-6000nm AR Coated Infrared IR Windows
3000–6000nm AR coated infrared IR windows is an optical window designed for wide-band mid- and long-wave infrared systems. Coligh manufactures various optical windows
- Wavelength range is 3000-6000nm high transmission and low reflection
- Broad band AR coating for 3000-6000nm
- Silicon substrate
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High-Transmission 3–6 µm AR-Coated IR Protective Window Description
3000-6000nm AR Coated Silicon-based Infrared Window Coligh manufactures, is an optical window based on high-purity single crystal silicon, optimized for the wide mid-infrared band 3-6μm
- We use gradient refractive index materials and implement broadband anti-reflection coatings through interference effects to reduce double-sided reflectivity and increase transmittance to more than 90%. Therefore, the window has high transmission performance in an ultra-wide band. The transmittance of 3000-6000nm is greater than or equal to 90%, which supports gas detection such as CO (4.6μm), NO (5.3μm), NH₃ (6.1μm), and efficient transmission of 5-6μm industrial lasers (such as CO₂ laser harmonics).
- We use silicon as the substrate, which has a natural transmission window in the 3-6μm band and extremely low mid-infrared absorption loss. In addition, it has extreme environmental tolerance and excellent thermal stability, chemical inertness and mechanical strength.
- We can provide customers with a variety of customization, including size, thickness, diameter, shape, extended band, etc.
3000-6000nm AR Coated Infrared IR Windows Technical Datasheet
| Parameter | Specification |
| Substrate Material | Silicon |
| Wavelength Range | 3000-6000nm |
| Coating Type | Anti-Reflective (AR) |
| Average Transmittance | ≥ 90% (within 3000-6000nm range) |
| Surface Quality | 60-40, 40-20 |
| Coating Method | Ion-assisted deposition / Electron-beam evaporation |
| Custom Options | Available upon request (wavelength tuning, dual-side，size up to 10000mm, any shape to be customized) |
3000-6000nm AR Coated Infrared IR Windows Applications
- Gas detection
The absorption peak of industrial waste gas NOx is at 5300nm, and the absorption peak of NH₃ is at 6100nm. These waste gas detections require wide-band high-transmittance windows. The transmittance of traditional zinc selenide drops sharply at >5μm, and it is easy to deliquesce and fail. This infrared window is used as an optical window for gas analyzers. It accurately captures weak absorption signals through >90% transmittance and improves detection sensitivity. - Laser processing
Lasers in the 5-6μm band require low-loss transmission windows. Traditional germanium windows have poor heat dissipation and are prone to optical path deviation due to thermal distortion. This window can be used as a laser output window to ensure stable transmission of laser energy through high transmittance and excellent thermal management. - Medical diagnosis
The thermal radiation characteristics of cancer tissues are more significant in the 5-6μm band, but the transmittance of traditional infrared windows is insufficient and the cost is high. This optical window can be used as a thermal imager window to efficiently transmit weak thermal signals and support accurate screening of early lesions.
