LA1257-C N-BK7 Plano-Convex Lens; Dia:25.0 mm; f=75.0 mm ARC 1050-1700nm

The LA1257-C is a plano-convex lens offered by Thorlabs, a leading global manufacturer of photonics components. This lens, designed from the high-quality N-BK7 glass by Schott, is specifically tailored for use in the 1050-1700nm wavelength range. The plano-convex shape, with a 25.0mm diameter and a 75.0mm focal length, is an excellent choice for a wide variety of applications.

The lens features a front and back coating of tho c bbar, providing anti-reflection properties that optimize its performance in the specified wavelength range. The edge thickness measures 2.02mm, while the center thickness is 4.1mm, ensuring durability and rigidity. The inner and outer radii are both 0mm, which is typical for plano-convex lenses.

The base shape of this lens is circular, and its geometry is spherical, with a radius of curvature (r1) of 38.6mm and a back focal length (bfl) of 72.2mm. The effective focal length (efl) is 75mm, which is a crucial factor in determining the lens's magnification and focusing capabilities.