This is a G063353329 Plano-Concave Lens, a spherical lens with a base shape of a circle. The lens is mounted on UVFS (Ultra-Violet Fused Silica) and has a diameter of 22.4 mm. The center thickness of the lens is 1.5 mm, and it has an effective focal length (EFL) of -50 mm at a wavelength of 1064 nm.
The lens's front and back surfaces are coated with Qio HP Nbar Arhs-Yag, a type of anti-reflective coating that enhances the lens's performance in the 355 nm wavelength range. The lens's geometry includes an inner radius of 0 mm and an outer radius of 0 mm, indicating that it is a simple plano-concave lens with one flat surface and one curved surface.
This lens is sourced from Qioptiq Photonics, a leading vendor in the field of precision optics. According to the vendor's information, the lens is in stock and available for immediate purchase. The lens's webpage provides more detailed information and specifications.