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3700-4800nm Antireflection Silicon Windows Optical
3700-4800nm Infrared Anti-reflective Silicon Windows Optical Suitable for light transmission in the 3700nm to 4800nm band. Coligh manufactures IR Silicon windows
- Wavelength range is 3700-4800nm high transmission and low reflection
- Broad band AR coating for 3700-4800nm
- Silicon substrate
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Infrared Antireflection Silicon Window 3700-4800nm Description
3700-4800nm Mid-IR Anti-Reflection Coated Silicon Window Coligh manufactures is designed for the 3.7-4.8μm mid-infrared band, with multi-layer anti-reflection coating on the surface. Through precise film design and silicon as the base material matching, we significantly reduce the surface reflectivity of the target band and increase the transmittance to more than 90%.
- In the 3.7-4.8μm band, this optical window has ultra-high transmittance and extremely low reflection, with a transmittance greater than or equal to 90%, which significantly improves the gas detection signal-to-noise ratio and laser system efficiency.
- Our ion beam assisted deposition equipment uses low refractive index materials to plate anti-reflection coatings, covering the entire 3.7-4.8μm band.
- The silicon substrate has the characteristics of high temperature resistance, thermal shock resistance, and environmental corrosion resistance, and can adapt to industrial combustion monitoring or high-temperature laser processing, petrochemical or medical disinfection environments.
3700-4800nm Antireflection Silicon Windows Optical Technical Datasheet
| Parameter | Specification |
| Substrate Material | Silicon |
| Wavelength Range | 3700-4800nm |
| Coating Type | Anti-Reflective (AR) |
| Average Transmittance | ≥ 90% (within 3700-4800nm 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) |
3700-4800nm Antireflection Silicon Windows Optical Applications
- Petrochemicals
In infrared monitoring of natural gas pipeline leaks, natural gas has a strong absorption peak at 3.3μm, and it is necessary to detect trace leaks in real time through infrared spectra in the 3.7-4.8μm band, but traditional germanium windows are prone to failure in high temperature and corrosive environments. This optical window can be integrated into an open optical path gas sensor to capture weak leakage signals - Healthcare
In non-invasive blood glucose detection spectrometers, human blood glucose has characteristic absorption in the 4.2-4.8μm band, and a high transmittance window is required to achieve non-invasive detection, but traditional materials are easy to deliquesce and expensive. This optical window can be embedded in portable blood glucose detection equipment, and a medical-grade protective layer is plated on the silicon surface to avoid skin contact allergies, and the detection accuracy is comparable to invasive blood sampling - Industrial lasers
4μm-band fiber lasers require low-reflection windows to reduce resonant cavity losses, but high-power lasers can easily cause thermal distortion or damage to traditional windows. This window can be used as an output coupling window for fiber lasers, supporting kW-level continuous laser output and avoiding beam distortion caused by thermal lens effect - Environmental monitoring
CO, NO, etc. in industrial waste gas need to be detected synchronously, but the multi-spectral system requires a wide-band high-transmittance window to simplify the optical path design. This infrared optical window can be installed in the Fourier transform infrared spectrometer (FTIR) sample cell, with a single window covering 3.7-4.8μm, replacing multiple beam splitters
