Germanium longpass filter is an optical filter made of germanium material, which is mainly used in infrared optical systems to allow long wave infrared light to pass and block short wave infrared light. Germanium longpass filters generally start transmitting at 4.5μm.
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What are the main applications of germanium longpass filters?
Infrared thermal imaging system: used to filter out short wave infrared light to improve imaging quality.
Infrared spectrometers: used to select infrared light at specific wavelengths to improve spectral resolution.
Laser system: used for beam shaping and wavelength selection to improve the performance of the laser system.