This is a Plano-Concave lens, a type of spherical lens, sourced from Qioptiq Photonics. The lens has a base shape of a circle and a diameter of 12.7 mm. The center thickness of the lens is 1.5 mm. The effective focal length (EFL) of this lens is -500mm, which is typical for Plano-Concave lenses and indicates that light rays are diverged after passing through the lens. The lens is made of N-BK7, a type of glass commonly used in optical applications due to its excellent optical properties.
The lens is designed to work with a wavelength of 588nm. It comes with anti-reflective coatings on both the front and back surfaces. The coating type is qio hp nbar arhs-yag, which is specifically designed to reduce reflection and increase transmission of light. This lens is currently in stock and available for purchase on the Qioptiq Photonics website.