ACL2520U ø25 mm Aspheric Condenser Lens; f=20.1 mm, NA=0.60 Uncoated

The ACL2520U is a high-quality aspheric condenser lens, designed and manufactured by Thorlabs. This lens, with a catalog number ACL2520U, is currently in stock and available for immediate purchase through their official website.

The lens is made of b270 schott, a durable and optical-quality material, ensuring clear and precise light transmission. The lens is designed for a wavelength of 633 nm, making it suitable for a wide range of applications that operate within this wavelength.

The ACL2520U features a circular base shape with a diameter of 25 mm. The lens has a thickness of 2.8 mm at the edge, an effective focal length (EFL) of 20.1 mm, and a numerical aperture (NA) of 0.6. The lens's front surface has an aspheric shape, with a radius of curvature (R1) of 10.462 mm and a conic constant (K1) of -0.6265. The back surface is planar.

The lens's thickness increases to 12 mm at the center, which is also the location of the lens's aperture. The lens's back focal length (BFL) is also 12 mm. The lens's surface irregularities are controlled within tight tolerances, with the front surface having an aspheric term (A4) of 1.5e-05.

Please note that the lens does not come with any coating. This uncoated lens is suitable for applications where coating is not required or preferred. The lens's high NA and aspheric design make it an excellent choice for condensing light in microscopy and other optical systems.