LB1904-A N-BK7 Bi-Convex Lens; Dia:1 in; f=125.0 mm ARC 350-700nm

The LB1904-A is a high-quality bi-convex lens, designed and manufactured by Thorlabs, a leading global supplier of photonics equipment. This lens, with a diameter of 1 inch (25.4 mm), is constructed from N-BK7 glass, a popular choice due to its excellent optical properties and wide transmission range.

The lens features a focal length of 125.0 mm, providing a large beam waist for efficient light collection and focusing. The bi-convex design, with radii of curvature of 128.2 mm on both sides, ensures a high-quality image with minimal spherical aberration. The lens has a center thickness of 3.3 mm and an edge thickness of 2 mm, providing robustness and durability.

The lens is coated with Thorlabs' ARC coating, designed for the 350-700 nm range. This anti-reflection coating reduces surface reflections, enhancing the transmission of light through the lens. The coating is applied to both the front and back surfaces of the lens, ensuring optimal performance.