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3000-12000nm AR Coated Silicon Infrared Optical Windows
3000–12000nm AR coated silicon infrared optical windows is a window component specially for MWIR to LWIR optical systems. Coligh manufactures infrared windows.
- Wavelength range is 3000-12000nm high transmission and low reflection
- Broad band AR coating for 3000-12000nm
- Silicon substrate
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High-Transmission AR Coated Silicon Window for 3000–12000 Nm Infrared Range Description
3000-12000nm AR Coated Silicon Infrared Optical Window Coligh manufactures uses high-purity single crystal silicon substrate and precision multi-layer anti-reflection (AR) coating technology to significantly improve its transmission efficiency in the 3-12μm band. It is specially designed for the long-wave infrared (LWIR) to far-infrared (FIR) bands.
- The transmittance is greater than or equal to 85% in the range of 3000-12000nm, supporting continuous coverage of 3-5μm (mid-wave infrared) and 8-12μm (long-wave infrared) scenes
- We use silicon as the substrate, and the reflection loss in the 3-5μm and 8-12μm atmospheric windows is as high as 30%-40%. By adopting a gradient refractive index multi-layer anti-reflection film, it is specially optimized for the 3-12μm band, reducing the reflection in this band range and significantly improving the transmission
- We have flexible customization capabilities, including coating, which can be customized for specific wavelengths and bands, support high-angle incident angle customization, and can also customize the size, thickness, surface type, and shape
3000-12000nm AR Coated Silicon Infrared Optical Windows Technical Datasheet
| Parameter | Specification |
| Substrate Material | Silicon |
| Wavelength Range | 3000-12000nm |
| Coating Type | Anti-Reflective (AR) |
| Average Transmittance | ≥ 85% (within 3000-12000nm 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) |
3000-12000nm AR Coated Silicon Infrared Optical Windows Applications
- High-power CO₂ laser processing
CO₂ lasers have an absorption peak at 10.6um and are widely used in metal cutting, welding and other scenarios. Traditional ZnSe windows are expensive and easy to deliquesce, while the absorption rate of germanium windows in the 10.6μm band is as high as 40%, resulting in thermal lens effect. AR-coated silicon windows can solve the reflection loss and thermal management problems at the same time. 3000-12000nm silicon windows can be used as output windows of laser processing heads, sealing and protecting the internal optical path, transmitting 10.6μm lasers and reflecting stray light. - Long-wave infrared imaging
Long-wave infrared 8-12μm thermal imaging can penetrate smoke and dust, but traditional Ge windows are heavy. Silicon-based AR windows have a transmittance of >85% at 8-12μm, which can be used as infrared lens front covers to protect detectors, and the coating design suppresses cold reflections - Far-infrared gas sensing
Many industrial gases such as SF₆ and O₃ have strong absorption peaks at 8-12μm, but traditional KBr windows are easy to deliquesce and germanium windows are too expensive. The silicon-based AR window has a transmittance of >85% at 8-12μm and is corrosion-resistant, making it suitable for online monitoring in the petrochemical and power industries. This optical window can be used as a gas chamber window for non-dispersive infrared (NDIR) sensors and used in conjunction with thermopile detectors. - Terahertz communication and imaging
Terahertz waves have great potential in 6G communications and security imaging, but traditional polymer windows have low transmittance in the far-infrared band. The silicon-based AR window can cover 3-12μm (corresponding to 1-3THz) and support high-resolution imaging. This optical window can be used as a sealed window for the transceiver module to transmit signals and shield environmental interference.
