ACL1815U 18 mm Aspheric Condenser Lens; f=15 mm, NA=0.57 Uncoated

The ACL1815U is an 18 mm Aspheric Condenser Lens offered by Thorlabs, designed with a focal length of 15 mm and a numerical aperture of 0.57. This uncoated lens is an excellent choice for applications that require high-quality imaging and light gathering capabilities.

The lens is made of B270 Schott glass, a popular material known for its excellent optical properties and durability. The aspheric design of the lens helps minimize spherical aberration, coma, and other optical aberrations, ensuring superior image quality and resolution.

The geometry of the ACL1815U includes an inner radius of 0, an outer radius of 0, a diameter of 18 mm, and a thickness at the edge of 2 mm. The effective focal length (EFL) is 15 mm, while the back focal length (BFL) is 10 mm. The lens's center thickness is 8.2 mm, and it has a high numerical aperture (NA) of 0.57.

The lens's conic constant (k1) is -1.817, and it has a series of aspheric coefficients (a2 to a16) that help shape the lens and further reduce optical aberrations. These coefficients are as follows: a2 front (0), a4 front (0.000293), a6 front (0), a8 front (0), a10 front (0), a12 front (0), and a14 front (0).

The ACL1815U is currently in stock and available for purchase through the Thorlabs website. With its high-quality construction, advanced design, and impressive specifications, this lens is an excellent choice for a wide range of optical applications.