This is a G311378400 18 mm Dia. N-BK7 Double-Convex Lens, with a focal length (EFL) of 16mm, sourced from Qioptiq Photonics. The lens is a Spherical Lens of the Sub Type Symmetric-Convex, featuring a Base Shape of Circular geometry.
The lens has a diameter of 18mm, with a thickness at the edge of 1.1mm and a center thickness of 7mm. The front and back of the lens are coated with qio silver ragv 45, providing excellent light transmission and protection.
The lens is made of N-BK7 Schott, a popular optical glass known for its excellent optical properties and wide transmission range. The lens's inner and outer radii are 0, and the curvature radii are 15.179mm for both the first and second surfaces.
This lens is designed to work at a wavelength of 587.6nm. It is currently in stock and available for purchase on the Qioptiq Photonics website.