This is the G312404331 model from Qioptiq Photonics, a 31.5 mm diameter N-BK7 Plano-Convex lens with an effective focal length (EFL) of 150mm. The lens is spherical in shape, featuring a plano-convex design with a base shape of a circle.
The lens's geometry includes a 2.4mm thickness at the edge and a 4mm thickness at the center. The inner radius is 0mm, and the outer radius is also 0mm. The lens is made of N-BK7 material, a popular choice in the optical industry due to its excellent optical properties and wide transparency range.
The lens is coated with Qio AL RALVIS AOI 45 on both the front and back surfaces, enhancing its performance in specific wavelengths, particularly at 588nm. This coating also provides anti-reflection properties, reducing unwanted reflections and increasing transmission.
The lens is currently in stock and available for purchase on the Qioptiq Photonics website. For more information, you can visit the provided weblink.