This is the BF-px-25.4-200, a 25.4 mm diameter Plano-Convex lens made from BaF2 (Barium Fluoride) material. The lens is sourced from Alkor Technologies and is currently in stock, as indicated by its valid weblink status.
The lens features a geometric design with a 2 mm thickness at the edge and a 2.9 mm thickness at the center. It has an effective focal length (EFL) of 200mm, making it suitable for a variety of optical applications. The lens's inner radius is 0, while the outer radius is also 0, indicating a plano surface on both sides.
The lens is made of BaF2, a material with a wavelength of 5000, suggesting its potential use in infrared or ultraviolet applications. The lens is spherical in shape and is uncoated, which may affect its transmission and reflection properties.
For more detailed information, please refer to the vendor's website at http://www.alkor.net/BaF2_lenses_pcx.html.