This is the G052309331 model from Qioptiq Photonics, a 12.7 mm diameter Plano-Concave Lens made of N-BK7 glass. The lens is mounted and has a center thickness of 1.5 mm. It features an effective focal length (EFL) of -100mm, making it a negative or diverging lens.
The lens's front and back surfaces are coated with Qio AL RALVIS AOI 45, which is designed to enhance its performance in specific applications. The radius of curvature for the first surface (R1) is -51.212mm, while the second surface has no curvature, indicated by an inner radius of 0mm and an outer radius of 0mm.
This lens is designed for use at a wavelength of 588nm. The N-BK7 glass, a common material for optical elements, is known for its excellent optical properties and durability. The lens's spherical shape ensures consistent performance across the entire surface.
The item data also indicates that this lens is in stock and available for purchase on the Qioptiq Photonics website. For more detailed information, you can visit the provided weblink.