This is a Plano-Convex Lens, sourced from the reputable vendor, Edmund Optics. It is specifically designed for use with a wavelength of 1550nm, making it suitable for various applications in this range. The lens has a diameter of 15.0mm and a focal length of 20.0mm, providing a base shape that is circular.
The lens's geometry is meticulously crafted, with an edge thickness of 1.52mm and a center thickness of 3.8mm. The effective focal length (EFL) is 20.0mm, and the radius of curvature (R1) is 13.46mm. The back focal length (BFL) is 17.74mm, and both the inner and outer radii are 0mm.
The lens is made from n-SF5 Schott, a material known for its excellent optical properties. It is coated with Edmund Optics' Las V-Coat 1550, a specialized coating that enhances its performance within the 1550nm wavelength range. This coating is applied to both the front and back surfaces of the lens.