43-825 9 mm Dia. N-BK7 Concave-Convex Spherical Mirror; EFL=4.5mm Protected Gold 700-10000nm

This 9 mm diameter concave mirror, sourced from Edmund Optics, offers a focal length of 4.5mm, making it ideal for compact optical systems. Its base shape is circular, ensuring uniform illumination across the mirror's surface. The mirror's geometry, including its 3mm thickness at the edge, contributes to its robustness and durability.

The mirror is made from N-BK7, a high-quality borosilicate glass known for its excellent optical properties. This material is particularly suitable for applications in the visible and near-infrared regions of the spectrum. The mirror's concave-convex spherical shape, with radii of curvature of -9mm for both surfaces, ensures precise light reflection and focusing.

The mirror's front surface is coated with protected gold, enhancing its reflectivity in the spectral range of 700-10000nm. This coating not only improves the mirror's performance in the infrared region but also provides excellent chemical resistance and durability.