Frequently Asked Questions

Germanium plano-convex lens have high infrared transparency (2–14 µm), a high refractive index (~4.0), and excellent durability, making them ideal for thermal imaging, spectroscopy, and CO2 laser systems.

Germanium is opaque to visible light, as it strongly absorbs wavelengths below approximately 2 µm, limiting its applications to the infrared spectrum.

Common AR coatings for germanium lenses include broadband anti-reflective (BBAR) coatings and diamond-like carbon (DLC) coatings, which help reduce surface reflections and enhance transmission.

Germanium is a hard and dense material (density ~5.33 g/cm³), offering high resistance to scratches and mechanical stress, making it suitable for harsh environments such as aerospace and military applications.

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