This is a 3.0mm diameter Plano-Concave lens, model 45-373, sourced from Edmund Optics. It features a focal length of -6 and is designed for use within the wavelength range of 400-700nm. The lens is made from n-sf11 Schott material, a high index glass with excellent transmittance in the visible spectrum.
The lens's geometry includes a thickness of 1.17mm at the edge and 1mm at the center, with an inner radius of 0mm and an outer radius of 0mm. The front and back surfaces of the lens are coated with EDM MgF2 std curve, a highly effective anti-reflection coating that reduces surface reflections and improves transmission.
This lens is a Spherical type, specifically a Plano-Concave lens, which means it has one flat surface and one curved surface that is concave. The Sub Type is Spherical Lens, indicating that the lens's curved surfaces are sections of a sphere.
The lens's web links are valid and indicate that it is currently in stock, making it readily available for immediate use in various optical applications.