What are the different types of meniscus lenses?

What is meniscus lens?

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Meniscus lens is a lens which has two spherical curved surfaces, convex on one side and concave on the other side. It is thicker at the center than at the edges. The lens provides a smaller beam diameter in order to reduce the beam waste and spherical aberration.

Types of meniscus lenses

• Positive lenses: Which used in applications that require small focal number, which is less than 2.5. For focal numbers ranging between 2.5 and 10, meniscus lens can minimize spot size and enhance image quality. The concave side of the positive lens has a smaller curvature, and the convex side has a greater curvature.

• Negative meniscus:The lenses which are used for applications using infrared materials with high refractive index. These lenses are used as an alternative to other negative lenses with a greater curvature on the concave side and a smaller curvature on the convex side. They are used in beam expanding applications that require minimal spherical aberration.

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Meniscus lenses from VY

Specifiction of our meniscus lens as follow:
*Material: BK7 or other optical materials 
*Dimension Tolerance :+0.0~-0.1mm 
*Center Thickness: +/-0.1mm 
*Focal Length Tolerance:+/-1%
*Surface Quality:40/20
*Surface Figure:lambda/2 at 633nm on plano side 
*Clear Aperture: >90%
*Chamfer: 0.25mm at 45 degree typical 
*Coating: Optional 

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Meniscus lenses

Meniscus lenses have two curved surfaces, one with an outward-curved face and the other with an inward-curved one. These lenses are also referred to as convex-concave lenses. The radius of the curvature of both surfaces can be chosen independently of each other.

Meniscus lenses are used in optical systems, in which aberrations need to be minimized. They are, for instance, used in multi-lens focusing objective, where they help to minimize the beam&#;s focal spot. The same benefit is applied in collimators.

Lenses with equal curvature radii on opposite sides are often used as substrates for output couplers or variable reflectivity resonator mirrors.

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