LD4271-UV 9 mm Dia. UVFS Double-Concave Lens; EFL=-9mm 245-400nm

The LD4271-UV is a high-quality spherical lens from Thorlabs, designed with a concave-concave base shape and a circular geometry. This lens boasts a 9 mm diameter and a center thickness of 2.5 mm, making it a compact yet robust optical component. The effective focal length (EFL) of this lens is -9 mm, indicating its double-concave nature, which is ideal for applications requiring strong negative dispersion.

The lens is constructed from UVFS, a material with a refractive index optimized for the ultraviolet (UV) spectrum, specifically designed for wavelengths between 245 and 400 nm. This makes the LD4271-UV particularly suitable for UV applications where high transmittance and excellent image quality are essential.

The lens features broadband anti-reflection (BBAR) coatings on both the front and back surfaces, specifically designed for the UV range (THO UVFS UVBAR). These coatings significantly reduce surface reflections, thereby enhancing the overall transmission of the lens and improving the overall image quality.