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Photonics Dictionary

singlet lens

A singlet lens is an optical lens made from a single piece of material, typically glass or plastic, with one or both surfaces being spherical or aspherical. It is the most basic type of lens used in optical systems.

Key characteristics of a singlet lens include:

Single element: Unlike compound lenses, which are made from multiple lens elements, a singlet lens is a single optical element.

Curved surfaces: The lens surfaces can be convex (curved outward), concave (curved inward), or a combination of both. The specific curvature determines how the lens focuses light.

Focus and magnification: Singlet lenses are used to converge (focus) or diverge light beams, depending on their shape, and are employed in applications requiring basic focusing or magnification.

Aberrations: Singlet lenses can suffer from optical aberrations, such as spherical aberration and chromatic aberration, which limit their performance in high-precision applications.

Applications of singlet lenses include:

Simple optical devices: Used in magnifying glasses, eyeglasses, and basic optical instruments where low cost and simplicity are important.

Beam focusing: Employed in laser systems and light collimation setups to focus or shape light beams.

Imaging systems: Sometimes used as components in more complex optical systems to provide initial focus or magnification.
 

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