This is the G052302000 6 mm Dia. N-BK7 Mounted Plano-Concave Lens, a high-quality optical component sourced from Qioptiq Photonics. The lens, which has a plano-concave geometry, is designed for use with a wavelength of 588 nm and is uncoated.
The lens is made from N-BK7, a popular glass type known for its excellent optical properties. It 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, indicating that it is a diverging lens, which spreads out light rays.
The lens's inner radius is 0, and its outer radius is also 0, suggesting that it has a flat surface on one side and a curved surface on the other. The curvature of the curved surface is defined by a radius of -3.101 mm, which is typical for plano-concave lenses.
This lens is mounted, making it ready for immediate use in optical systems. The web link provided leads to the product page on Qioptiq's website, where you can find more information and check the current availability of the lens.