A390-A 6 mm Dia. H-LAK54 Molded Glass Aspheric Lenses; EFL=4.6 mm; NA=0.53 AR 350-700nm

The A390-A is a high-quality aspheric lens, precision-molded from H-LAK54 glass, a type of crown glass known for its excellent homogeneity and low auto-fluorescence. This lens is designed for use in the visible spectrum, with a wavelength of 655 nm, and features an effective focal length (EFL) of 4.6 mm, making it suitable for a wide range of optical applications.

The lens has a diameter of 6 mm and a thickness of 1.64 mm at the edge, ensuring durability and resistance to damage. The center thickness is 3.1 mm, providing a good balance between optical performance and mechanical strength. The lens's shape is defined by its front and back radii of curvature, with r1 being 42.19 mm and r2 -3.5 mm.

The A390-A's aspheric design significantly reduces spherical aberration, providing superior image quality compared to traditional spherical lenses. The lens's numerical aperture (NA) is 0.53, indicating a wide acceptance angle and high light-gathering capability.

The lens is coated with a broadband anti-reflection coating, optimized for the 350-700 nm range. This coating reduces surface reflections, improving transmission and enhancing overall system performance.

The A390-A is available from Thorlabs, a leading vendor in the field of optical components. According to the vendor's website, the lens is currently in stock, ensuring quick delivery and minimal lead times.