This is the LPX-25.0-51.9-C, a 25 mm diameter Plano-Convex lens made from N-BK7 Schott glass. This lens is sourced from CVI Laser Optics and is part of their spherical lens catalog. The lens is uncoated and has an effective focal length (EFL) of 100mm, making it suitable for a variety of imaging applications.
The lens geometry is characterized by a 2.5mm edge thickness and a 4mm center thickness. The radius of curvature (R1) is 51.9mm, and both the inner and outer radii are 0mm, indicating a plano surface on the opposite side of the convex surface. The lens is designed for use at a wavelength of 546.1nm.
The LPX-25.0-51.9-C is available from CVI Laser Optics and is currently in stock. For more detailed specifications, please refer to the product catalog available at https://www.idexot.com/media/wysiwyg/cms-pages/pdf/2-Spherical_Lenses.pdf.