G314324329 25.4 mm Dia. N-BK7 Plano-Concave Lens; EFL=-500mm 1064nm

This is a Plano-Concave lens with a diameter of 25.4 mm, sourced from the renowned optical components manufacturer, Qioptiq Photonics. The lens is made of N-BK7, a popular glass type known for its excellent optical properties, particularly its high refractive index and low dispersion.

The lens features a concave shape on one side, with a radius of curvature (R1) of -260.39 mm. This shape is designed to diverge light, making it suitable for applications such as beam expanders or collimators. The effective focal length (EFL) of this lens is -500 mm, which indicates that it will produce a virtual image when used with a collimated beam.

The lens has a center thickness of 1.5 mm and no mount. It is designed to operate at a wavelength of 588 nm, but it can also be used at other wavelengths, as indicated by its coating. Both the front and back surfaces of the lens are coated with Qio HP Nbar ARHS-YAG, a coating that enhances its performance in the infrared region, particularly at 1064 nm.

This lens is a Spherical lens, meaning it has a spherical surface on both sides. The spherical shape ensures a high degree of symmetry, which is beneficial for imaging applications.