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3000-5200nm Silicon Infared IR Window
3000-5200nm Silicon Infared IR Window is an optical window designed for the combined application of mid-wave infrared and long-wave infrared. Coligh manufactures IR windows.
- Wavelength range is 3000-5200nm high transmission and low reflection
- Broad band AR coating for 3000-5200nm
- Silicon substrate
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Broadband Silicon IR Window Covering 3–5.2 µm Wavelength Range Description
3000-5200nm silicon-based infrared window Coligh manufactures efficiently transmits mid-infrared light signals. It is an optical window made of high-purity single-crystal silicon material specially optimized for the mid-infrared band (3-5.2μm).
- This optical window has a wide-band high transmittance performance, and the transmittance is greater than or equal to 90% in the range of 3000-5200nm, which makes up for the defect that the transmittance of uncoated silicon is about 50%
- For the 3-5.2μm band, we use multi-layer dielectric film to reduce the double-sided reflectivity and improve the transmittance
- We use silicon as the substrate. The characteristic of silicon itself is that it can withstand high temperatures, and the operating temperature range is -100°C to +250°C. At the same time, it is resistant to acid and alkali corrosion and is suitable for harsh industrial environments such as petrochemicals and pharmaceuticals.
- We provide flexible customization services, including diameter, thickness, shape, single-sided and double-sided coating, etc.
3000-5200nm Silicon Infared IR Window Technical Datasheet
| Parameter | Specification |
| Substrate Material | Silicon |
| Wavelength Range | 3000-5200nm |
| Coating Type | Anti-Reflective (AR) |
| Average Transmittance | ≥ 90% (within 3000-5200nm 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) |
3000-5200nm Silicon Infared IR Window Applications
- Military optoelectronic systems
In battlefield environments, infrared imaging systems need to resist sand and dust impact and wet and hot corrosion. Traditional zinc selenide windows have low hardness and germanium windows are bulky and fragile. 3000-5200nm Silicon Infared IR Window can be used as a protective window for infrared detectors, transmitting 3-5.2μm thermal radiation signals while resisting sand and stone scratches and mechanical impacts with high hardness. - Scientific research spectral analysis
Scientific research spectrometers require wide-band 3-5.2μm, low-noise optical components. Traditional materials are prone to deliquesce, and uncoated silicon windows have serious reflection interference. This optical window is used as a light path transmission window. It suppresses stray light through AR coating, ensures the purity of experimental signals, and supports extreme environments of high temperature/low temperature. - Medium-wave/long-wave infrared laser system window
Laser communication, remote sensing, and ranging systems need to transmit or receive 3–5 μm, 5–5.2 μm band lasers to the outside world; ordinary optical materials will strongly absorb or reflect in this band, affecting laser power and mode. This infrared window outputs/receives laser beams losslessly, ensuring beam quality and maintaining laser system efficiency. - Industrial infrared sensing and temperature measurement
The infrared radiation generated by industrial environments (high-temperature furnaces, smelting, heat treatment, etc.) is concentrated at 3–5 μm and above. This optical window can resist high temperatures and thermal shocks to isolate high-temperature environments; and its high transmittance ensures that the sensor receives the true thermal radiation intensity.
