The LB1391-A is a high-quality bi-convex lens made from N-BK7 glass, a popular material for optical elements due to its excellent optical properties. This lens, sourced from Thorlabs, features a diameter of 1 inch and a focal length of 400.0 mm, making it suitable for a wide range of applications.
The lens's geometry includes a thickness of 2 mm at the edge and 2.4 mm at the center, with a back focal length of 399.2 mm. The inner and outer radii are 0, indicating a symmetrical design. The lens's shape is spherical, a common choice for its simplicity and versatility.
The LB1391-A is coated with ARC 350-700nm on both the front and back surfaces, enhancing its performance in the specified wavelength range. This anti-reflective coating reduces unwanted reflections and increases transmission, improving the lens's overall efficiency.
The lens's material, N-BK7, is known for its low dispersion and high homogeneity, making it an excellent choice for applications requiring high image quality and precision. The lens's bi-convex design, where both surfaces are convex, provides a large field of view and low spherical aberration.