ACL2018U 20 mm Aspheric Condenser Lens; f=18.1 mm, NA=0.52 Uncoated

The ACL2018U is a high-quality 20 mm Aspheric Condenser Lens, featuring an effective focal length of 18.1 mm and a numerical aperture of 0.52. This lens is sourced from Thorlabs, a renowned vendor known for their precision optical components.

The lens is designed with a circular base shape and is constructed from b270 Schott, a durable and optical-quality glass material. It has a diameter of 20 mm and a thickness of 1.8 mm at the edge, ensuring robustness and stability. The center thickness of the lens is 8 mm, and it has a back focal length of 13 mm.

The ACL2018U boasts an aspheric shape, which is characterized by its complex surface profile. This design helps to minimize spherical aberration, providing superior image quality and resolution. The lens's surface profile is defined by its radii of curvature (r1 = 9.415 mm, r2 = 0 mm), and its conic constant (k1 = -0.6392). Additionally, it has higher-order aspheric coefficients (a2 front to a16 front) that are zero, indicating a high level of symmetry and precision in its design.

The lens is uncoated, meaning it does not have any anti-reflective or other surface treatments. This may result in some reflective loss, but it also ensures the lens's high surface quality and durability.

The ACL2018U is currently in stock and available for immediate purchase. For more information, you can visit the product page at Thorlabs' website using the provided weblink.