Ge Spherical Lens is a precision optical lens made from Germanium (Ge), a material widely used for infrared optical systems due to its excellent transmission in the 2–12 μm wavelength range. It is commonly used in thermal imaging cameras, infrared spectroscopy systems, defense optics, and industrial temperature monitoring devices. The spherical design allows efficient focusing and imaging in IR systems while maintaining high refractive index performance. Germanium lenses are typically coated to reduce surface reflection and improve transmission efficiency. They are essential in LWIR and MWIR optical systems where high sensitivity and accurate thermal detection are required.