LB1294-C N-BK7 Bi-Convex Lens; Dia:1 in; f=175.0 mm ARC 1050-1700nm

The LB1294-C is a high-quality bi-convex lens, designed and manufactured by Thorlabs, a leading global supplier of photonics equipment. This lens boasts a diameter of 1 inch and a focal length of 175.0 mm, making it suitable for a wide range of optical applications.

The lens is crafted from N-BK7, a popular borosilicate glass known for its excellent optical properties. This material is characterized by a low coefficient of thermal expansion, making it resistant to thermal shock. The lens also features an anti-reflection coating, optimized for the 1050-1700nm wavelength range, which enhances its transmission capabilities and reduces unwanted reflections.

The lens's geometry is another notable feature. It has a center thickness of 4.7 mm and an edge thickness of 2 mm, providing robustness and stability. The radii of curvature for the first and second surfaces are 179.8 mm and -179.8 mm, respectively, which contributes to its bi-convex shape. The back focal length is 174 mm, and the effective focal length is 75 mm.