69-682 25mm Dia. x 25mm FL; Coated; Si Plano-Convex Lens BBAR 3-5µm

The 69-682 is a 25mm diameter, 25mm focal length Plano-Convex lens, designed for use in the 3-5µm wavelength range. This lens is sourced from Edmund Optics, a leading global manufacturer and supplier of optical components.

The lens is made from silicon, identified by the material ID "silicon sal vil 1957". This material is well-suited for use in the mid-infrared region due to its high refractive index and transparency in this spectral range. The lens features a plano-convex geometry, where one side is flat and the other is curved, with a radius of curvature of 60.44mm. This design allows for efficient light collection and focusing.

The lens has a thickness of 2.19mm at the edge and 3.5mm at the center, providing rigidity and durability. The effective focal length (EFL) is 25mm, which is the distance from the lens's principal point to its focal point. This EFL, combined with the lens's diameter, makes it suitable for a wide range of applications.

The lens is coated with a broadband anti-reflection (BBAR) coating on both the front and back surfaces. This coating reduces reflection losses across the entire 3-5µm wavelength range, improving transmission and enhancing the lens's performance. The coating is applied using Edmund Optics' advanced deposition techniques, ensuring high-quality and reliable performance.