This is a Plano-Concave Lens, type Lens, sourced from EKSMA Optics. The lens has a Sub Type of Spherical Lens and a Base Shape of Circular. The lens is uncoated, as indicated in the 'coating' parameter which is an empty object.
The lens has a diameter of 38.1 mm and a thickness edge of 5.8 mm. The thickness at the center of the lens is 4.1 mm. The Effective Focal Length (EFL) of the lens is -200 mm. The first radius of curvature (r1) is -103.7 mm, and the Inner and Outer Radius are both 0 mm.
The lens is made of n-bk7 schott material, as indicated in the 'Material ID' parameter. The wavelength of the lens is 546 nm. The lens's shape is spherical.
The weblink provided leads to the product page on EKSMA Optics' website, and the link status is 'Valid - in stock', indicating that the lens is available for purchase.