This is the PLCX-25.4-27.5-UV, a Plano-Convex Spherical Lens with a diameter of 25.4 mm, sourced from CVI Laser Optics. The lens is designed for use with a wavelength of 266 nm and is made from UVFS material, specifically identified as "UVFS MAL-1965".
The lens's geometry is characterized by an outer radius of 27.48 mm, an inner radius of 0 mm, and a thickness at the edge of 2.89 mm, which increases to 6 mm at the center. The effective focal length (EFL) of this lens is 55 mm.
The lens is uncoated, which means it does not have any additional layers to enhance its optical properties. This could be suitable for applications where specific coating is not required or preferred.
The lens is currently in stock and more information about it can be found in the provided weblink. This includes detailed specifications and other relevant data that might be helpful in your selection process.