This is the G063347331 model from Qioptiq Photonics, a 22.4 mm diameter UVFS mounted double-concave lens with an effective focal length (EFL) of -50mm. The lens is made of UVFS material with the Mal-1965 identification.
The lens features a spherical shape, with a first radius (R1) of -50.481mm and a second radius (R2) of 50.481mm. The center thickness of the lens is 1.5mm. The inner and outer radii are both zero, indicating a symmetrical concave-concave design.
The lens is coated with Qio AL RALVIS AOI 45 on both the front and back surfaces, providing enhanced performance and durability. The lens is designed for use with a wavelength of 355nm.
The lens is currently in stock and available for purchase on the Qioptiq Photonics website. For more information, please refer to the provided weblink.