Unlike Spherical Lenses, which produce a point focused spot, Cylinder Lenses can produce a linear focused spot. LBTEK Cylinder Achromatic Doublet Lenses are specifically designed to minimize chromatic aberration and can therefore be used to focus polychromatic beams in a single direction. For ease of use, the Lens is pre-mounted in a 25.4 mm diameter black anodized aluminum alloy mounting ring. The housing surface is engraved with the Item, AR Coating Range, and Focal Length (f), and features two identification markings: an arrow indicating the direction the Lens should face when collimating a line light source, and an infinity symbol (∞) indicating that the Lens has an infinite conjugate design—for example, when a source of Divergent Light is placed at the Focal Length (f) from the plano side of the Lens, the light emerging from the curved side is parallel light. Cylinder Lenses have important applications in various experimental setups, including beam shaping, laser projection, holography, etc. LBTEK Cylinder Achromatic Doublet Lenses can significantly reduce chromatic aberration and, when monochromatic light is used, can produce a diffraction-limited focused spot in one direction. The Cylinder Achromatic Doublet Lenses provided by LBTEK are coated with standard Antireflection Coating (AR Coating). Among them, the A coating is designed for the 350 nm-700 nm band, and the B coating is designed for the 650 nm-1050 nm band; both coatings are applied to the outer surfaces of the Lens;