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1450-5500nm AR Coated Silicon Infrared IR Window
1450-5500nm AR Coated Silicon Infrared IR Window is designed to minimize transmission reduce reflection in 1450-5500nm. Coligh manufactures infrared windows.
- Anti reflective coating
- Broad band high transmission range1450-5500nm
- Silicon substrate
Broadband AR Coating on Silicon Window for 1450-5500nm Infrared Range Description
The 1450-5500nm AR-coated silicon infrared window produced by Coligh is specially designed for mid-wave to long-wave infrared (MWIR–LWIR) optical systems, with excellent transmittance and anti-reflection capabilities.
- This infrared optical window has a wide-band high transmittance performance and is optimized for the 1450-5500nm mid- and far-infrared bands. The transmittance in the 1450-5500nm range reaches more than 90%, ensuring efficient transmission of infrared signals.
- For this optical window, we use a high-purity single-crystal silicon substrate. The silicon material has a high melting point and can work stably in a wide temperature range of -50℃ to +250℃, which is suitable for high-temperature industrial environments. In addition, the silicon material has low intrinsic absorption in the infrared region, and combined with precision polishing technology, it has the advantages of ultra-low absorption and scattering.
- We use multi-layer optical anti-reflection coating technology to significantly reduce the surface reflectivity
1450-5500nm AR Coated Silicon Infrared IR Window Technical Datasheet
| Parameter | Specification |
| Substrate Material | Silicon |
| Wavelength Range | 1450-5500nm (SWIR-MWIR-FIR） |
| Coating Type | Anti-Reflective (AR) |
| Average Transmittance | ≥ 90% or >=93%(within 1450-5500nm range) |
| Surface Quality | 60-40, 40-20 |
| Coating Method | Ion-assisted deposition / Electron-beam evaporation |
| Custom Options | Available upon request (wavelength tuning, dual-side) |
1450-5500nm AR Coated Silicon Infrared IR Window Applications
Industrial high temperature monitoring
In industrial high temperature environments, traditional optical materials are susceptible to thermal deformation or failure, while silicon materials have a high melting point (1414℃) and AR coatings are resistant to high temperatures and can withstand extreme temperatures for a long time. This optical window can be used as an observation window for high-temperature furnaces, vacuum coating equipment, or semiconductor wafer processing equipment, directly exposed to high temperature areas, and used with infrared thermal imagers or sensors to monitor temperature distribution, material melting state, or process defects in real time.
Gas sensing
The characteristic absorption peaks of gases such as methane and CO₂ are located in this window band. The high transmittance of silicon materials combined with AR coatings can maximize signal strength. The 1450-5500nm optical infrared window can be used as an optical window for infrared gas sensors, installed in the detection cavity or open optical path, allowing infrared light to efficiently penetrate and interact with gas molecules, and accurately quantify gas concentrations through spectral analysis.
Laser processing and communications
CO₂ lasers and some lasers are located in the 1450-5500nm window band. AR coatings can significantly reduce reflection losses to protect lasers and improve energy utilization. This optical window can be used as a protective window at the laser output port or in optical transmission to isolate pollutants such as processing smoke and water vapor while ensuring efficient penetration of the laser beam.
