D-shaped pickoff mirrors are specifically designed to enable the separation of closely spaced optical beams. With the reflective coating extended to near the flat edge of the fused silica substrate, very closely aligned beams can be picked off. D-shaped broadband metallic mirrors operate over a very broad spectral range from UV to IR and are an excellent choice for general purpose applications. D-shaped broadband dielectric mirrors offer near total reflection over a spectral range of up to several hundred nanometers, minimizing losses in almost all optical systems.