An optical lens is an optical device that converges (focus) or disperses an incident light, the transmitted light rays then form a real or virtual image of the object. This lens comes in different types and shapes, like the simple lens which is just a single piece of transparent glass, the compound lens which is a combination of a set of simple lenses arranged along a common axis and in a defined pattern. Similarly, there are objects that either focus or disperse waves and they are also called lenses like explosive lenses, such as microwave lenses, electron lenses, and acoustic lenses. Lenses are transmissive in nature just like filters, laser optics windows, flats, prisms, beamsplitters, and waveplates. This mirror comes in different shapes like a biconcave lens, Plano concave lens, Plano-Convex Lens, positive meniscus, negative meniscus, and biconvex lens and this optical lense types can either be a positive lens(converging lens) or negative lens(diverging lens).
Classification Of Lens
Cylindrical Lens
The cylindrical lens has a curved surface which can be in the form of a cylinder. Cylindrical lenses are commonly used to change an image’s aspect ratio or shape a laser beam. Due to their shape, their focus transmitted light to a line.
Fresnel Lens
This lens consists of thin, lightweight plastic sheets marked with a series of concentric grooves. Each groove serves as an individual refracting surface; the series of grooves bend collimated light to a common focal point.
Spherical Lens
This is a type of lens with curved surfaces which is either a converging lens or a diverging lens
Achromatic Lens
The achromatic lens is also known as achromat is a lens that limits the effect of spherical and chromatic aberration. This lens is made of two glasses, one is a negative (concave) with high dispersion, and the other is a positive (convex) made of crown glass with lower dispersion. The lens elements are mounted next to each other, often cemented together, and shaped so that the chromatic aberration of one is counterbalanced by the other. At Alpine research optics we have a wide array of lens system including lasers co2.
Gradient Index Lenses
In gradient Index Lenses, an incoming light ray is first refracted when it enters the lens surface because of the abrupt change of the refractive index from air to the homogeneous material. The light travels in a straight line passing through the lens until it comes out through the outlet where it is refracted.
Types Of Optical Lens
Bifocal Lenses
The Bifocal lens type consists of two lenses to correct both near and far-sighted vision. Bifocals have a visible dividing line between the two. They contain two optical powers and they are for both far and short sight.
Progressive Lens
Progressive or multifocal enables the wearer to see all the way from the distance, up to near focus lengths, and everything in between.
Trifocal Lens
This lensing system comes with three regions for close intermediate and distant vision.
Telephoto Lens
This lens is used mainly in photography and cinematography in which the physical length of the lens is shorter than the focal length.
Toric Lens
This lens has a different optical power and focal length in two orientations that are perpendicular to each other.
