Although not as widely known as convex or concave lenses, cylindrical lenses play an important role across numerous applications thanks to their distinct capabilities. This article explores the fundamentals of cylindrical lenses, shedding light on their working principles and use cases.
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Cylindrical lenses, as the name implies, have a cylindrical shape in at least one section. Unlike spherical lenses, which evenly focus or disperse light in all directions, cylindrical lenses are designed to direct light in just one dimension. This distinctive feature makes them invaluable for applications where other lenses simply cannot deliver the required precision.
The unique shape of a cylindrical lens allows it to focus light from sources like lasers into a straight line. This capability to control light in a single dimension, either compressing or expanding it, makes cylindrical lenses incredibly versatile. Their design enables precise bending and focusing of light to meet the demands of specific applications.
Figure 1. Typically, laser diodes emit light with an elliptical profile that requires correction. Image Credit: Shanghai Optics
Cylindrical lenses are available in different materials, such as fused silica (JGS1, Corning , JGS2), optical glass (BK7, B270, H-K9L from Ohara, Schott, CDGM, or Corning), IR materials (MgF2, Ge, CaF2, Si), and other options such as optical plastics and sapphire.
Source: Shanghai Optics
Specifications Factory Standards Manufacturing Limit Dimension Tolerance +/-0.03 mm +/-0.01 mm Center Thickness Tolerance +/-0.03 mm +/-0.02 mm Radius Tolerance +/-0.3 % +/-0.1 % Surface Quality(S/D) 40-20 10-5 Irregularity(Plano Surface) 1/8Lambda < 1/15Lambda Irregularity(Cylindrical Surface) 1/4Lambda < 1/8Lambda Centration(arc min) 3' 1'
Cylindrical lenses are widely used across various industries, including:
These specialized optical tools play a crucial role in directing light in a single dimension, with applications ranging from correcting astigmatism in ophthalmology to shaping laser beams for enhanced performance. The variety of cylindrical lenses available highlights their importance in advancing tools and technologies across multiple fields.
Shanghai Optics specializes in delivering high-quality, custom-built cylinder lenses.
This information has been sourced, reviewed and adapted from materials provided by Shanghai Optics.
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Correcting Astigmatism
Cylindrical lenses are commonly used in ophthalmology for the treatment of astigmatism. A corneal distortion is typically the cause of astigmatic vision. If your cornea is astigmatic, the points of focus will be off on each of the three main axes. Using a cylindrical optical lens, we can shift the focal point of one axis so that it lies over the other.
Laser Scanning Microscopy
They are commonly used in conjunction with acoustic-optic deflectors, allowing the focal point of a variable lens to move side to side without movable parts. For laser scanning microscopy, the spherical lens adjusts the image and helps to focus the light point on the appropriate plane.
Entertainment
Digital cinema cameras use cylindrical optical assembly to squeeze widescreen footage onto 35mm film. Furthermore, digital/laser projectors use the same technology to stretch the footage to be correctly displayed on a widescreen.
Laser Line Scanning
This method converts the physical form of a 3D item into a digital representation. It is especially useful in this field as well as prototyping, gardening, and building construction. This scanning method calculates the amount of distortion introduced to a straight line by a non-flat surface while using a cylindrical lens. With the help of cameras and triangulation, we can measure how the laser line shape changes and approximate the object's shape.
Optical Spectroscopy
Cylindrical lenses are commonly used in the construction of optical spectrometers. It focuses light into a single line for a linear photodetector when placed in front of a diffractive grating element.
Laser Beam Shape Correction
A laser's light should be a perfect circle, but semiconductor lasers have an elliptical beam profile. So, there is a need to change the shape of the beam to make it collimate and connect it to any optical fiber. This can be done by putting a cylindrical lens in front of the laser beam with its central part perpendicular to the fast axis.
Contact us to discuss your requirements of cylindrical lenses for laser systems. Our experienced sales team can help you identify the options that best suit your needs.