G313374322 12.7 mm Dia. N-BK7 Double-Concave Lens; EFL=-50mm 450-700nm

This is a G313374322 model double-concave lens, sourced from the reputable optical components manufacturer, Qioptiq Photonics. The lens boasts a 12.7 mm diameter and a center thickness of 1.5 mm, making it a compact yet robust option for various applications.

The lens's primary feature is its double-concave geometry, which is characterized by two concave surfaces. This design results in a negative focal length, denoted as EFL=-50mm. The lens's effective focal length is -50mm, which means that it will cause parallel light rays to converge before the focal point. This property makes it suitable for use in imaging systems, beam expanders, and other applications where light needs to be focused or diverged.

The lens is made from N-BK7, a high-quality borosilicate glass known for its excellent optical properties. This material is particularly suitable for applications in the visible spectrum, as indicated by the wavelength of 588nm. The lens's coating, qio bbar arb2visnbk7, is applied to both the front and back surfaces, further enhancing its performance in the visible range. This coating reduces reflection and increases transmission, making the lens more efficient in transmitting light.

The lens's shape is spherical, a common and practical choice for many optical systems due to its ease of manufacturing and alignment. The inner and outer radii are both zero, indicating that the lens's curved surfaces are symmetrical.