Coated Optical Cemented Achromatic Double Lenses

Achromatic lenses, usually consisting of two optical elements cemented together.It is the most cost-effective lens for good polychromatic illumination and imaging.Achromatic are excellent focusing components for reducing chromatic aberration of broadband light sources used in many analytical and medical devices.

Achromatic lens can be defined as a lens which is made by a combination of two different types of lenses carrying different focal powers in a manner such that the images formed by the light of both the combined lenses are free from chromatic aberration or achromatism.
Most commonly used and the earliest example of an achromatic lens is the achromatic doublet.

General structure of Achromatic lens 

Achromatic lenses is made from a pair of glasses, of which one is typically a concave and another is convex.
The concave element of the doublet is composed of flint glass (with higher dispersion); the convex element, however, is made up of crown glass (with low dispersion). These two elements are placed (cemented) next to each other in such a manner that the chromatic aberration of the one element is balanced by the chromatic aberration of another.
There are various types of achromatic lenses, which differ in the type of lens elements and optical properties.

Application of Achromatic lens?

Achromatic lenses are suitable for a variety of applications, including fluorescence microscopy, image relay, inspection and spectroscopy, and are widely used in multi lens optical systems usually composed of multiple achromatic lenses.

This Achromatic lens shows pictures

The Achromatic lens specification

Optical glass Achromatic lenses comes in a variety of configurations, most notably, positive, negative, triplet, and aspherized. It is important to note that it can be a doublet or triplet ; the number of elements is not related to the number of rays for which it corrects. In other words, an achromatic lens designed for visible wavelengths corrects for red and blue, independent of it being a doublet or triplet configuration.