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Infrared (IR) Longpass Filters
In infrared optical systems, filters play a critical role in precisely controlling the passage of light at specific wavelengths to optimize imaging quality or signal detection. An infrared Longpass filter is an optical element that allows the transmission of long-wave infrared light (usually light with a wavelength greater than a certain cutoff value, such as 5μm, 8μm, or 10μm) while blocking short-wave radiation. These filters are widely used in thermal imaging, gas detection, military reconnaissance, industrial monitoring and scientific research.
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How to choose materials for IR longpass filters?
Material Transparent Range(um) Refractive Index Advantage Disadvantage Applicable Scene
Ge 2-16 ~4.0 High refractive index, corrosion resistance High price and temperature sensitivity (performance degradation >100°C) Military infrared, laser systems
ZnSe 0.5-20 ~2.4 Wide band transmission, low absorption Softer and easier to scratch CO₂ laser, thermal imaging
ZnS 0.4-12 ~2.2 Wear resistance and high mechanical strength Absorption peaks in some bands Harsh environment applications
Si 1.2-7 ~3.4 Low cost and easy to process Opaque in the 8-14 μm band SWIR
CaF2 0.15-9 ~1.4 Low refractive index, resistant to laser damage Easy to moisture, need to be coated with protective coating Spectrometer, UV-IR broadband
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