What is a Negative meniscus lens?

Negative Meniscus Lens is a type of meniscus lens, also known as negative focal length meniscus lens. Its shape is similar to convex-concave lens, but the center of the negative meniscus lens is thinner than the periphery, while the center of the positive meniscus lens is thicker than the periphery. The design purpose of the negative meniscus lens is to minimize spherical aberration. The negative meniscus lens consists of a convex surface and a concave surface, with the concave surface having a larger curvature radius. When combined with another lens, the negative meniscus lens will reduce the numerical aperture of the system. Negative meniscus lens is a commonly used optical component in beam expansion systems.

Characteristics of negative meniscus lens:

The negative meniscus lens consists of two surfaces with similar curvature radii and has a negative focal length. It is usually used for beam expansion, increasing focal length, and reducing numerical aperture. In order to reduce spherical aberration, when used for beam expansion or collimation of divergent light, the beam should be incident on the convex surface of the lens; when used for converging light collimation, the beam should be incident on the concave surface. The negative meniscus lens is mainly used to minimize spherical aberration. When used in combination with another lens, the positive meniscus lens can increase the focal length and reduce the numerical aperture of the system without introducing significant spherical aberration. Coated lenses are also widely used in visible light and near-infrared applications. Meniscus lenses are used for convex-concave lenses in CO2 lasers and Infrared Optical systems. Convex-concave lenses can reduce spherical aberration and produce the smallest collimated incident light focal point. Positive Meniscus Lenses are used to reduce the focal length of another lens while maintaining the angular resolution of the optical component. The materials include BK7, UV fused silica, CaF2, and ZnSe, etc. Negative meniscus lenses are commonly used in infrared applications. The concave side of these lenses has a larger curvature and the convex side has a smaller curvature, which can be used as alternatives to other negative lenses.

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