This is a G063071322 Plano-Concave Lens, a high-quality optical component sourced from Qioptiq Photonics. The lens, which is mounted, has a diameter of 22.4 mm and a center thickness of 1.5 mm. The effective focal length (EFL) of this lens is -50mm, making it a concave lens. The lens is designed to work with light in the wavelength range of 450-700nm, which covers the visible light spectrum.
The lens is made of N-BK7, a popular optical glass from Schott. This material is known for its excellent optical properties, making it a common choice for a wide range of optical applications. The lens features a spherical geometry, which is a common shape for optical lenses due to its ease of manufacturing and good optical performance.
The lens is coated with qio bbar arb2visnbk7 on both the front and back surfaces. This coating is designed to enhance the lens's performance in the visible light spectrum, reducing reflections and improving transmission.