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2000-4000nm AR Coated Silicon China Infrared Window
2000-4000nm AR Coated Silicon China Infrared Window is designed exceptional transmission and minimal reflection in 2000-4000nm. Coligh manufactures IR windows
- Broadband Anti-Reflective Coating 2000-4000nm
- High Transmission Performance 2000-4000nm
- High-Quality Silicon Substrate
Infrared Silicon Window Manufacturer China 2000-4000nm Range Description
2000-4000nm AR Coated Silicon Infrared Window Coligh manufactures is a high-performance optical window designed for the mid-infrared band . It uses a high-purity single-crystal silicon substrate made in China and combines multi-layer anti-reflection coating technology to achieve ultra-high transmittance and low reflectivity in the target band.
- We optimize the narrow band of 2000-4000nm, with a transmittance greater than or equal to 92%, significantly improving the transmittance of the mid-infrared band
- We use Ion-assisted deposition / Electron-beam evaporation for AR coating to achieve uniform anti-reflection in the full band of 2000-4000nm.
- This infrared window uses a high-purity single-crystal silicon substrate, and undergoes a precision polishing process to reduce scattering losses
2000-4000nm AR Coated Silicon China Infrared Window Technical Datasheet
| Parameter | Specification |
| Substrate Material | Silicon |
| Wavelength Range | 2000-4000nm |
| Coating Type | Anti-Reflective (AR) |
| Average Transmittance | ≥ 92% (within 2000-4000nm range) |
| Surface Quality | 60-40, 40-20 |
| Coating Method | Ion-assisted deposition / Electron-beam evaporation |
| Custom Options | Available upon request (wavelength tuning, dual-side) |
2000-4000nm AR Coated Silicon China Infrared Window Applications
Infrared thermal imaging
In military reconnaissance or security monitoring, infrared thermal imaging needs to capture the target’s thermal radiation signal in the 2-5μm band. Silicon materials have high transmittance in this band, but the reflection loss of the uncoated silicon window surface is as high as 30%, resulting in a decrease in the imaging signal-to-noise ratio. Installing a 2000-4000nm AR-coated silicon window on the front end of the infrared camera can be used as a protective lens and optical transmission component to significantly improve the clarity of thermal imaging.
Gas sensing
Most greenhouse gases have characteristic absorption peaks in the mid-infrared band (3-4μm), and infrared spectrometers require high-transmittance windows to ensure detection sensitivity. Silicon materials have a transmittance of >50% at 3-4μm, but reflection on the bare silicon surface will cause energy loss in the optical path. This infrared window protective film can be placed at both ends of the gas chamber of the non-dispersive infrared (NDIR) sensor and used with a PbSe detector to improve the system signal-to-noise ratio
Astronomical observation
Ground-based infrared telescopes need to observe celestial radiation in the 2-5μm band, but water vapor in the atmosphere absorbs part of the band. AR2000nm-4000nm coated silicon window can be used for low temperature cooling detectors to reduce the interference of cold reflections in optical systems.
