As the most common type of lens element, a plano-convex lens is a convergent lens with one flat surface and one convex surface that allow for light to be focused, collected and collimated. More specifically, the two surfaces of a plano-convex lense function together by focusing parallel light rays to a positive focal point. In doing so, the plano-convex lens forms real images that can be easily manipulated through the use of spatial filters. The asymmetry of Plano-Convex Lenses reduces spherical aberration in applications where the image and object lie at unequal distances from the lens. The curved surface of a plano-convex lens has a focusing effect on light-rays, while the plane surface does not have a focusing or de-focusing effect. Some common applications for plano-convex lenses include light collimation or monochromatic processes that are required in pharmaceutical, industrial, robotics or defense sects.
To further enhance the capabilities of plano-convex lenses, antireflective coatings can be added to meet various optical systems, lasers and assemblies’ requirements. When used to cut steel or other thick materials, plano-convex lenses provide users with a greater cut width, which, as a result, supports the ability of the laser’s oxygen to enter the material and assist in the cutting rocess. Furthermore, when used for these cutting applications, plano-convex lenses have also been shown to provide a greater depth of field that is required to maintain a taperless edge.
The maximum sharp focus is achieved when the curved portion of the lens is oriented toward the object. Plano-convex lenses are used for applying focus to an optical system, and collimating diverging light beams. Plano-convex lenses have both positive focal lengths and an orientation that plays a crucial role in determining image quality. Low spherical aberration is obtained if the lens is orientated in a way that causes the collimated beam to enter or exit the curved surface, thereby making the plano side face towards the point source or focus.
The minimum order quantity of plano-convex elements ranges between 100 and 1000 units.
The focal length of the lens can be calculated using a simple equation, as follows:
1/f = (n-1) (1/Rf – 1/Rb)
In this equation, f is the focal length of the lens, whereas Rf and Rb represent the radii of curvature of the front and back bounding surfaces. For plano-convex lenses, Rf > 0 and Rb = ∞.
This article was updated on the 26th October, 2018.
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