AL2018 20 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=18 mm; NA=0.49 Uncoated

The AL2018 is a high-precision aspheric lens offered by Thorlabs, designed with a diameter of 20 mm and a focal length of 18 mm. This lens is crafted from S-LAH64, a high-quality optical glass from Ohara, ensuring superior optical performance. The lens's base shape is circular, and it features a high numerical aperture (NA) of 0.49, making it suitable for applications requiring high light-gathering capabilities.

The aspheric design of the AL2018 is achieved through precise CNC polishing, which helps minimize spherical aberration and other optical aberrations. This results in improved image quality and increased efficiency in light transmission. The lens's geometry includes an inner radius of 0 mm, an outer radius of 0 mm, a thickness at the edge of 3.5 mm, and a center thickness of 7.1 mm.

The lens's surface profile is defined by its conic constant (k1) of -1.4 and aspheric coefficients (a2 to a16). These values contribute to the lens's unique optical characteristics, enabling it to deliver high-quality images even in off-axis applications. The lens is uncoated, providing users with the flexibility to apply their preferred coating based on their specific application requirements.

The AL2018 is currently in stock and available for immediate shipping. For more information, users can visit the product webpage provided by Thorlabs.