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 25.4 mm. The center thickness of the lens is 1.5 mm, and it has an effective focal length (EFL) of -100 mm, making it a negative lens. The inner radius of the lens is 0 mm, and the outer radius is also 0 mm.
The lens is made of N-BK7 Schott, a popular optical glass known for its excellent optical properties. It is designed to work with a wavelength of 588 nm. The lens features a front and back coating of qio bbar arb2visnbk7, which enhances its durability and performance in the visible light spectrum.
The lens is currently in stock and available for purchase on the Qioptiq Photonics website. For more detailed information and specifications, please refer to the provided weblink.