Contact Us

Introduction and Application of Cylindrical Lenses

What is a cylindrical lens?

A cylindrical lens is a lens with different radii on the X and Y axes, giving the lens a cylindrical or semi-cylindrical shape and magnifying images only along a single axis. Cylindrical lenses are commonly used as light line generators or for adjusting the height and correcting astigmatism in imaging systems.

A cylinder lens focuses light into a line instead of a point, similar to a spherical lens. One or more surfaces of a cylindrical lens are part of a cylinder and focus the image through the intersection of the line parallel to the lens surface and tangent to the surface. The lens compresses the image in the direction perpendicular to this line, while maintaining the image unchanged in the direction parallel to it (in the tangential plane). Compound lenses combine the effects of cylindrical and spherical lenses.

What is the normal shape of a cylindrical lens?

Cylindrical lenses are usually rectangular, square or circular, and have designs such as plano-convex or plano-concave, bi-convex cylindrical lenses, bi-concave cylindrical lenses, crescent-shaped cylindrical lenses, semi-cylindrical lenses, concave cylindrical lenses, and negative cylindrical lenses.

What are the applications of cylindrical lenses?

Cylindrical lenses are used in a wide range of industrial, research and OEM applications, such as spectroscopy, holography, laser scanning metrology, acousto-optic and laser diode applications. The lenses are usually customized to fit the application.

Cylindrical lenses are most commonly made of rectangular convex cylinders. The method of mounting the cylinder for manufacturing is influenced by the radius of curvature and the size parallel to the cylinder axis. If the radius of curvature of the substrate is shorter, it is usually mounted around a barrel-shaped tool, while if the radius of curvature is longer, the substrate is typically mounted on a flat plate with a curved mounting surface.

Carefully mounting the substrate to the tool is essential to ensure that the lens specifications are not affected. Due to the lack of spherical symmetry in cylindrical lenses and the fact that the optical axis is a plane, not a line, centration is a more demanding process. In most cases, the lens specifications are under process control. The cylinder axis must be referenced when mounting the substrate. The same mounting plate or cylinder must be used in the grinding, smoothing, and polishing of each lens to ensure uniformity.

Related Content
  • What Is a Fisheye Lens?

    November 14, 2023Increasing creative inspiration with fisheye lensesThe fisheye lens in photography depends entirely on your need for the broadest view of the world. Like everything else, this lens is just a tool that...view
  • Focus on Precision: Achromatic Triplets in Microscopy Applications

    December 20, 2023When it comes to precision in microscopy, one cannot underestimate the importance of high-quality optical components. One such component is the Achromatic Triplet, which plays a vital role in improvin...view