Meniscus lens

Meniscus Lenses

OPTICST

规格

ItemOP12
MaterialBK7, FS, UVFS, CaF2, ZnSe
Diameter Tolerance+0.0, -0.15 mm
Focal Length Tolerance±3%
Centration<3 arc minutes
Clear Aperture>90%
Chamfer0.25 mm @ 45°
Surface Quality40-20 scratch & dig
Design Wavelength633 nm
AR CoatingsNone. Please refer to the Coatings Service
Convex-concave (Meniscus Lenses) lenses can be either positive or negative focal length, depending on the relative curvature of the two surfaces. Negative Meniscus lenses have a steeper concave surface and are thinner at the centre than at the periphery. Conversely, a positively curved Meniscus lens has a steeper convex surface and is thicker at the centre than at the periphery. An ideal thin lens with two equally curved surfaces would have zero optical power, meaning that it would neither concentrate nor diffuse light.
The achromatic lens is a combination of two lenses made of two materials, machined by gluing together two surfaces of matching curvature on the concave and convex sides using an optical adhesive, the achromatic lens focuses (images) all the white light entering the lens at the same point on the other side of the lens. When used on an axis, the achromatic lens focuses the parallel input beam to a perfect "point". The achromatic lens can be used for light collimation and light focusing, as well as for high quality imaging on the axis.

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