10400nm (10.4μm) Infrared Longpass Optical Filter
10.4μm infrared longpass optical filter is designed to transmit longer wavelength than 10.4μm and block shorter. Coligh manufactures infared longpass filter.
- 50% Transmission Wavelength at 10400 nm
- >90% High Transmission
- Broadband Blocking and Transmission
- Insensitive to Angle of Incidence
- Hard First-Surface Dielectric Coating
Products Categories
Get A Free Quote
long-wave Infrared Longpass Filter With 10400 nm Cut-on Wavelength Description
10400nm infrared longpass optical filter is specially designed for long wave infrared range 8-14μm. It can ensure efficient transmission of infrared radiation ≥10.4μm, while strictly blocking stray light interference of visible light, near infrared and mid-infrared stray light.
- 50% transmittance is located at 10.4μm, ensuring efficient use of the target band. It can accurately separate far-infrared signals
- In the range of 10500-15000nm, the transmittance is greater than or equal to 90%, and the support of wide passband improves the sensitivity and utilization of infrared signals.
- In the range of 1500-9700nm, the cutoff depth is less than 1% transmittance, that is, greater than OD2, which can effectively filter out visible light, near infrared and mid-infrared noise
10400nm Infrared Longpass Optical Filter Technical Datasheet
| Parameter | Specification |
| Cut‑on Wavelength (50% T) | 10400nm |
| High‑Transmission Band | ≥ 90% @ 10500nm-15000nm |
| Blocking Region | 1500nm-9700nm |
| Optical Density (OD) | OD >2 (T < 1%) |
| Substrate Materials | White glass, Sapphire, Silicon, Fused Silica, Zinc Selenide |
| Coating Type | Hard first‑surface all‑dielectric |
| Surface Quality | 80-50, 60‑40, 40-20 scratch‑dig (MIL‑PRF‑13830B) |
| Clear Aperture | ≥ 90% of full aperture |
| Available Diameters | Ø12.7 mm, Ø25.4 mm, or custom |
| Thickness | 2.0mm or custom |
10400nm Infrared Longpass Optical Filter Technical Applications
- CO₂ laser system
The operating wavelength of CO₂ laser is 10.6μm, but there may be short-wave visible light or near-infrared stray light from the pump source or ambient light in the system, which will interfere with laser transmission or damage optical components. The 10400nm infrared long-pass filter can strictly block all non-laser wavelengths <10.4μm, allowing only 10.6μm laser to pass efficiently, while serving as a protective window to protect the laser cavity. This can improve the accuracy and energy utilization of laser processing (cutting, welding). - Thermal imaging and military
Thermal imaging relies on the 8-14μm thermal radiation of the target object, but short-wave radiation such as sunlight and light will reduce image contrast, especially in complex environments. 10800nm long-pass filter can filter out interference light <10.4μm, only transmit far-infrared heat signals, and enhance target recognition capabilities at night or under haze conditions - SF₆, CH₄ industrial gas monitoring
CH₄ and SF₆ have characteristic absorption peaks in the far infrared at 10.7μm, but light of other wavelengths will cause spectral data distortion. This filter can block visible light and mid-infrared light in non-target bands, and only allow light of 10.4–14μm to pass through, matching the gas absorption spectrum. Improve gas detection sensitivity and accuracy,
Get Free Quote Of 10.4 μm IR Longpass Filter For Thermal Imaging Applications
Related Products
Related News
Introduction: What Is Full-Band Infrared? “Full-band infrared” typically refers to infrared technologies capable of detecting and imaging across the key […]
