This is a Plano-Concave Lens, a type of spherical lens, sourced from Qioptiq Photonics. The lens has a diameter of 6 mm and a center thickness of 0.5 mm. The effective focal length (EFL) of this lens is -6 mm, making it a negative lens, which means it diverges light.
The lens is made of N-BK7, a type of glass commonly used in optical applications due to its excellent optical properties. The inner and outer radii of the lens are 0, indicating a plano surface on both sides.
The lens is designed for use with a wavelength of 588 nm and comes with a coating on both the front and back surfaces. The front coating is qio hp nbar arhs-yag, and the back coating is also qio hp nbar arhs-yag. This coating enhances the lens's performance by reducing reflection and increasing transmission.
The lens is currently in stock and available for purchase on the Qioptiq Photonics website. For more information, you can visit the provided weblink.