43-839 50 mm Dia. N-BK7 Concave-Convex Spherical Mirror; EFL=25mm Protected Gold 700-10000nm

This is a 50 mm diameter concave-convex spherical mirror from Edmund Optics, designed for use in a wide range of optical systems. The mirror has a protected gold coating, optimized for use in the 700-10000 nm wavelength range, making it suitable for applications such as infrared spectroscopy and imaging.

The mirror's geometry is characterized by its concave shape with a radius of curvature of -50 mm for both the front and back surfaces, leading to a flat plane at the mirror's center. This design results in an effective focal length (EFL) of 25 mm, which is the distance from the mirror's center to the focal point.

The mirror is made from N-BK7 glass, a popular material for optical elements due to its excellent optical properties and high transparency in the visible and near-infrared regions. The glass has a thickness of 6 mm at the edge, providing structural rigidity while minimizing weight.

The protected gold coating on the front surface enhances the mirror's reflectivity in the infrared region, ensuring high-quality performance in its intended application. The coating is protected against oxidation and other environmental factors, ensuring long-term durability and stability.