Germanium (Ge) Lenses

Features

· Ge Substrate

· Ø1/2" and Ø1" Versions Available

· Broadband AR Coating for the 7-12 μm Range

· Focal Lengths from 15.0 - 1000.0 mm Available

COE Optics' Ø1/2" and Ø1" Germanium (Ge) Plano-Convex Lenses are available with a broadband AR coating for the 7-12 μm spectral range deposited on both surfaces. This coating greatly reduces the high surface reflectivity of the substrate, yielding an average transmission in excess of 94% over the entire AR coating range.

Due to its broad transmission range (2 - 16 µm) and opacity in the visible portion of the spectrum, germanium is well suited for IR laser applications. It is also inert to air, water, alkalis, and acids (except nitric acid). Germanium's transmission properties are highly temperature-sensitive; in fact, the absorption becomes so large that germanium is nearly opaque at 100 °C and completely non-transmissive at 200 °C. For other MIR lenses and spherical singlets, please reach us by email via sales@coeoptics.com.