A397-B 7.2 mm Dia. H-LAK54 Molded Glass Aspheric Lenses; EFL=11 mm; NA=0.3 AR 650-1050nm

The A397-B is a high-quality aspheric lens from Thorlabs, designed with a 7.2 mm diameter and a molded H-LAK54 glass substrate. This lens is specifically engineered for use in the 650-1050nm wavelength range, making it suitable for a wide range of optical applications.

The lens boasts an effective focal length (EFL) of 11 mm, which is a crucial parameter in determining the lens's magnification and field of view. The EFL, combined with the lens's high numerical aperture (NA) of 0.3, allows for a wide angle of view and high light-gathering capability, making it ideal for imaging and beam shaping applications.

The A397-B features a sophisticated aspheric design, which helps to minimize spherical aberration and distortion, common issues in traditional spherical lenses. This design ensures that the lens delivers superior image quality, with sharp focus and high resolution across the entire field of view.

The lens is coated with a broadband anti-reflection coating, which significantly reduces surface reflections and increases transmission in the 650-1050nm range. This coating enhances the lens's performance in high-power applications, where thermal effects and surface damage can be a concern.