Edmund Optics’ TECHSPEC Germanium IR aspheric lenses include a variety of coating options and provide diffraction-limited focusing performance over a broad spectral range in the mid- and long-wave regions. Each of the lenses is available uncoated or with broad-band anti-reflective (BBAR) coating options. Every BBAR coated lens features greater than 95% transmission and less than 0.5% reflection, and can be integrated into a variety of OEM applications. Standard Germanium IR aspheric lenses come in a 25-mm-diameter size, with focal lengths of 12.5 to 75 mm, in uncoated, 3-5 µm coated, and 8-12 µm coated versions. Applications include monochromatic light sources such as quantum cascade lasers and as a high-performance alternative to standard plano-convex lenses.