This is a Plano-Concave Lens, type G314420331, sourced from Qioptiq Photonics. The lens has a diameter of 10 mm and a center thickness of 1 mm. The effective focal length (EFL) of this lens is -16 mm, indicating that it is a diverging lens, causing incoming light rays to spread out.
The lens is made of UVFS material with a Mal-1965 ID. It is designed to operate at a wavelength of 355 nm. The lens features a Qio AR Al RALVIS AOI 45 coating on both the front and back surfaces, which helps to reduce reflection and increase transmission.
The lens's geometry is spherical, with a radius of curvature of -8.175 mm for the concave surface. The inner and outer radii are 0, indicating that the lens has a uniform thickness.
The lens is available for purchase from the Qioptiq Photonics website, where it is currently in stock. The provided weblink leads directly to the product page for easy access and purchasing.