Germanium IR Components | MWIR/LWIR Lenses, Windows, Prisms | PE OpticsPeoptix offers premium germanium (Ge) infrared optical components designed for exceptional performance in the 3–5μm (MWIR) and 8–14μm (LWIR) atmospheric windows. Our single-crystal germanium elements deliver high transmittance, ultra-high refractive index (~4.0), and low dispersion—making them the gold standard for advanced thermal imaging, FLIR, defense, security, and industrial infrared systems.