Lens: Diameter from 0.5mm to 2500mm,Surface Quality: 10-5 S/D... Material::BK7, fused silica, borofloate, CaF2, MgF2, Ge, Si, ZnSe, ZnS, SF, LaF, BaK... Coating: AR coating,Al/Au reflective coating,BBAR coating,DLC coating,Dielectric HR coating... Application: In the field of Defence,Imaging,medical,laser,sensor,Biochemical... Features: Germanium (Ge) Optical Components are used in many Infrared (IR) applications or systems, including thermal imaging, spectroscopy, or with monochromatic light sources such as quantum cascade lasers. German (Ge) Optical Components are Optical Components designed for high performance in the Infrared (IR) spectrum without the use of Infrared (IR) anti-reflection coatings. Germanium (Ge) Optical Components can range from Optical Lenses to Prisms or Optical Filters. Benefits: High transmission and low dispersion for superior image quality Precise focal length for accurate focus and optimal clarity Durable and rugged design for long-lasting performance Customizable mounting options for easy integration