AL5040 50 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=40 mm; NA=0.55 Uncoated

The AL5040 is a high-precision aspheric lens offered by Thorlabs, designed with a 50 mm diameter and a focal length of 40 mm. This lens is crafted from S-LAH64, a high-refractive index material from Ohara, which enables superior optical performance. The lens's aspheric design effectively minimizes spherical aberration, a common issue in traditional spherical lenses, thereby enhancing image quality and resolution.

The lens's geometry includes an inner radius of 0 mm, an outer radius of 0 mm, and a thickness at the edge of 5 mm. The effective focal length (EFL) is 40 mm, and the lens features a high numerical aperture (NA) of 0.55, which allows for a wide angle of view and increased light-gathering capability. The center thickness of the lens is 15.5 mm, and it boasts an asphericity of r1 at 31.075 mm, with r2 being 0 mm.

The lens's surface conforms to a unique aspheric profile, defined by coefficients k1 (-0.744), k2 (0), a2 front (0), a4 front (4.3665221e-07), a6 front (-2.2713591e-10), a8 front (-1.7042174e-13), a10 front (-3.6809344e-17), and a12 front (8.9443459e-21), a14 front (1.8501188e-23), a16 front (-6.2704333e-27). These coefficients ensure the lens's high-precision performance and accuracy.

Please note that the lens is uncoated, which may affect its transmission and scattering properties depending on the application. Always consider the environmental conditions and wavelength requirements when selecting an optical component.