13-465 25mm Dia. CaF2 Aspheric Lens; EFL=20mm; NA=0.63 Uncoated

The 13-465 is a 25mm diameter Aspheric Lens, featuring a high refractive index and excellent optical performance. This lens, offered by Edmund Optics, is uncoated and has a focal length of 20mm, making it suitable for a wide range of applications.

The lens is made from Calcium Fluoride (CaF2), a material with a high transmission range from the UV to the near-IR. This makes it an ideal choice for applications that require broadband transparency. The lens's aspheric design helps to minimize spherical aberration, providing sharper images and improved optical performance.

The lens has a numerical aperture (NA) of 0.63, which is a measure of the light-gathering ability of the lens. A higher NA allows for greater light collection, making this lens suitable for high-resolution imaging applications. The lens's geometry includes an inner radius of 0, an outer radius of 0, a thickness at the edge of 2mm, and a thickness at the center of 14.1mm.

The lens's geometry also includes a back focal length (BFL) of 10.89mm, which is the distance from the lens's rear surface to its principal plane. This is an important consideration when designing optical systems, as it can affect the overall system's size and performance.

The lens is uncoated, meaning it does not have any anti-reflective coatings. While this can lead to increased reflection at the air-lens interface, it can also simplify the design and manufacturing process, reducing costs.