354560-C 6.325 mm Dia. D-ZK3 Molded Glass Aspheric Lenses; EFL=13.9 mm; NA=0.18 AR 1050-1700nm

The 354560-C 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 performance.

The lens features an effective focal length (EFL) of 13.9 mm, which is a critical parameter in determining the lens's magnification and field of view. The EFL, combined with the lens's high numerical aperture (NA) of 0.18, allows for a wide angle of view and high light-gathering capability, making it ideal for imaging and beam shaping applications.

The 354560-C lens is coated with a broadband anti-reflective (AR) coating, optimized for the 1050-1700 nm range. This coating reduces surface reflections, thereby increasing transmission and improving overall system performance. The lens's aspheric design helps to minimize spherical aberration, a common issue in traditional spherical lenses, which leads to improved image quality and system efficiency.

In terms of geometry, the lens has an inner radius of 0, an outer radius of 0, a thickness at the edge of 2.282 mm, and a thickness at the center of 2.773 mm. The lens's front and back surfaces are coated with the same broadband AR coating, ensuring optimal performance from both sides.