This is a 25.4 mm diameter Plano-Convex lens, manufactured by Qioptiq Photonics, featuring an effective focal length (EFL) of 1000mm. The lens is made of N-BK7, a popular glass type in the optical industry, known for its excellent optical properties and versatility.
The lens's geometry is characterized by a thickness of 3.8mm at the edge and 4mm at the center. The front surface of the lens has a radius of curvature of 508.45mm, while the back surface is planar. The lens's coating is Qio Silver Ragv 45, applied on both the front and back surfaces, which enhances its performance in specific wavelengths.
This lens is spherical in shape and is mounted, making it ready for immediate use in various applications. The web link provided leads to the product page on Qioptiq's official website, where you can find more information and check the current availability of the lens.