354560-A 6.325 mm Dia. D-ZK3 Molded Glass Aspheric Lenses; EFL=13.9 mm; NA=0.18 AR 350-700nm

The 354560-A is a high-quality aspheric lens from Thorlabs, designed with a 6.325 mm diameter and a molded D-ZK3 glass material. This lens is specifically engineered for use in the 650 nm wavelength range, making it suitable for a variety of applications that require precise optical control.

The lens features an effective focal length (EFL) of 13.9 mm, which is the distance from the lens's principal point to its focal point. This EFL, combined with the lens's 0.18 numerical aperture (NA), allows for a wide field of view and high light-gathering capability. The NA is a measure of the range of angles over which the lens can accept or emit light, making it a critical factor in determining the lens's performance.

The 354560-A lens boasts a sophisticated aspheric design, which helps to minimize spherical aberration and distortion. This design is achieved through the use of complex surface profiles that deviate from the simple spherical shape. The result is a lens that provides superior image quality and resolution compared to traditional spherical lenses.

The lens is coated with an anti-reflective (AR) coating, specifically designed for the 350-700 nm wavelength range. This coating helps to reduce surface reflections, thereby improving transmission and enhancing the overall performance of the lens.