ACL1210U Ø12 mm Aspheric Condenser Lens; f=10.5 mm, NA=0.54 Uncoated

The ACL1210U is a high-quality aspheric condenser lens, 12 mm in diameter, manufactured by Thorlabs. This lens is designed for use with a wavelength of 633 nm and has a numerical aperture (NA) of 0.54, providing a high level of light gathering capability. The lens is uncoated, offering a cost-effective solution for many applications.

The lens features an effective focal length (EFL) of 10.5 mm, which is the distance from the lens's principal point to the focal point when the lens is used in air. This EFL makes the ACL1210U suitable for a wide range of optical systems. The lens's geometry includes a center thickness of 5.8 mm and an edge thickness of 1.9 mm, contributing to its robustness and durability.

The ACL1210U's aspheric design helps to reduce spherical aberration, a common issue in traditional spherical lenses. This is achieved through the use of a conic constant (k1) of -0.623 and higher-order aspheric terms (a4, a6, a8, a10, and a12), all of which are zero in this lens. The lens's front surface has an asphericity (a2 front) of 0.

This lens is made of B270 Schott glass, a popular choice for optical elements due to its excellent optical properties and chemical resistance. The lens is available for purchase through the Thorlabs website, where you can find more detailed specifications and related products.