ACL3026U-A ø30 mm Aspheric Condenser Lens; f=26 mm, NA=0.55 AR 350-700nm

The ACL3026U-A is a high-quality aspheric condenser lens, designed and manufactured by Thorlabs. This lens boasts a catalog number of ACL3026U-A and is available for purchase directly from Thorlabs' website, where it is currently in stock.

This lens is specifically designed for use in the optical spectrum, with a central wavelength of 633nm. It is constructed from B270 Schott glass, a popular material known for its excellent optical properties and durability. The lens features a circular base shape, with a diameter of 30mm and a thickness at the edge of 2.1mm.

The ACL3026U-A has an effective focal length (EFL) of 26mm, which is the distance from the lens's principal point to its focal point. This EFL, combined with the lens's numerical aperture (NA) of 0.55, allows for a wide field of view and high light-gathering capability.

The lens's geometry is defined by several key parameters. The inner radius is 0mm, while the outer radius is also 0mm. The back focal length (BFL) is 18mm, which is the distance from the lens's rear principal point to its focal point. The thickness at the center of the lens is 11.9mm.

The lens's aspheric shape is defined by several coefficients. The conic constant (k1) is -0.6301, while the aspheric coefficients (a2, a4, a6, a8, a10, a12, a14, a16) are 0, 5.5e-06, 0, 0, 0, 0, 0, 0 respectively. These coefficients ensure the lens's surface is precisely shaped to minimize spherical aberration and other optical distortions.

The lens is coated with a broadband anti-reflection (AR) coating, designed to reduce surface reflections and increase transmission in the 350-700nm spectral range. This coating is applied to both the front and back surfaces of the lens.