What are cylindrical lenses? Cylinder (cylindrical) lenses are lenses that have at least one part that resembles a cylinder. They are similar to spherical lenses because they both use curved surfaces to focus or spread light. However, cylindrical lenses can only focus or spread light in one direction and don’t change how light moves in the vertical direction. This can’t be done with spherical lenses because they focus or expand light in a way that is the same no matter which way you turn it.
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Cylinder lenses are an important part of controlling and shaping laser beams. For example, they change the shape of laser sheets and make elliptical beams round. Due to the cylinder lens’s uneven shape and the unique needs of the manufacturing process, the wedge, center, and axial torsion must be defined and appropriately controlled.
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.
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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.
01 Jun
An achromatic cylindrical lens can minimize chromatic aberration, so it can be used to focus a single direction of a multi-color light beam. Unlike a spherical lens that produces a point-focusing spot, an achromatic cylindrical lens can produce a linear focusing spot. Our cylindrical achromatic doublets are pre-installed in a Ø1" housing for ease of use. The housing is engraved with the part number, the range of the increased projection film, the focal length, the arrow indicating the direction the lens should face when the quasi-linear light source, and the infinity symbol indicating that the lens has an infinite conjugate ratio. As one of the professional optical components companies, BRD Optical can provide various achromatic cylindrical lenses. If you have a demand, please feel free to contact us.
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