Optical Lenses

The different types of optical lenses are optimized for special applications. The following section explains the typical applications of the lenses.

Plano-convex lenses (PCX)

Plano-convex lenses have a positive focal length. They are most suitable where one conjugate is more than five times the other, e.g. in sensor applications or for use with nearly collimated light. They are also used in applications where both conjugates are on the same side of the lens, e.g. as an add – on lens to increase the numerical aperture.

Double-Convex lenses (DCX)

Double-Convex (DCX) lenses are most suitable where the conjugates are on opposite sides of the lens and the ratio of the distances is less than 5:1, e.g. as simple image relay components.

Plano-Concave lenses (PCV)

Plano-Concave (PCV) lenses have one flat and one inward curved surface. PCV lenses have a negative focal length and are used for image reduction or to spread light.

Double-Concave lenses (DCV)

Double-Concave (DCV) lenses have two inward curved surfaces. DCV lenses have a negative focal length and are used for image reduction or to spread light.

Cylindrical lenses

Cylindrical lenses are used to spread or focus light in one plane.

Achromatic lenses

Achromatic lenses consists of two or more elements, usually of crown and flint glass, such that the composite element has been corrected for chromatic aberration with respect to two selected wavelengths. In these lenses, chromatic, spherical and coma aberrations are considerably reduced. These components are designed with respect to three wavelengths: 480 nm, 546nm and 644nm. Use achromats to replace singlets where performance must be improved.