35-639 101.6mm Dia. x 119mm EFL; 45° Protected Gold 100A; Off-Axis Parabolic Mirror Protected Gold 700-10000nm

The 35-639 is a high-quality Off-Axis Parabolic Mirror, sourced from the renowned optical vendor, Edmund Optics. This mirror, with a diameter of 101.6mm and a protected gold coating, is designed for use in the 700-10000nm wavelength range, making it suitable for a wide range of applications, particularly in infrared (IR) systems.

The mirror's geometry is a key feature, with a 101.6mm Plane Flat Length (PFL), an Effective Focal Length (EFL) of 119.03mm, and a 45° off-axis angle. This configuration allows for precise light manipulation and focusing, which is crucial in many optical systems. The off-axis angle of 45° is particularly noteworthy, as it allows for efficient light collection and distribution without the need for a central obscuration, which can be a common issue with on-axis designs.

The mirror's material is another important aspect. It is made from n-BK7 Schott, a high-quality borosilicate glass known for its excellent optical properties, including high transparency and low dispersion. This makes the mirror an ideal choice for applications that require high-precision optical performance.

The mirror's coating is a protected gold 100A coating, which provides excellent reflectivity across the specified wavelength range. The 'protected' nature of the coating ensures durability and resistance to tarnish, ensuring the mirror maintains its performance over time.