Offering alternative to ZnSe and brittle Germanium lenses, TECHSPEC® Silicon Aspheric Lenses are suited for midwave infrared applications. RoHS-compliant units provide diffraction-limited performance and withstand effects of harsh environments. Manufactured using optical-grade silicon substrate, lenses are available in six 25 mm diameter models, with focal lengths of 12.5, 25, and 50 mm and either 3-5 µm anti-reflection coating or uncoated.