One side of meniscus lens is convex, another side is concave. It can be a convergent lens or a divergent lens, which is decided together by refractive index, curvature and radius.
Positive meniscus (convex-concave) lenses are designed to minimize spherical aberration. When used in combination with another lens, a positive meniscus lens will shorten the focal length and increase the numerical aperture (NA) of the system without introducing significant spherical aberration. When used to focus a collimated beam, as shown in the diagram above, the convex side of the lens should face the source to minimze spherical aberration.
Negative meniscus lenses are designed to minimize spherical aberration. These N-BK7, UV fused silica, calcium fluoride, and zinc selenide lenses consist of a convex surface and a concave surface where the concave surface has the greater radius of curvature. In combination with another lens, a negative meniscus lens will decrease the NA of the system. A negative meniscus lens is a common element in beam expanding applications.
specification:
| Material | BK7, Fused Silica,Ge,Si, CaF2. |
| Diameter | 5-500mm |
| Surface Figure | λ/2 |
| Diameter Tolerance | +0.01, -0.01 mm |
| Thickness Tolerance | ±0.1 mm |
| Paraxial Focal Length | ±2% |
| Centration | <3 arc minutes |
| Clear Aperture | >90% |
| Surface Quality | 60-40 scratch and dig or better |
| Protective Bevel | 0.25 mm x 45° |
| Coating: | Specified by customers |
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Factory information
Yutai Optics, we specialize in the design and volume manufacturing of high performance optical components such as lens,prisms, windows,filters,mirrors and more for use in optical instruments and laser systems, as well as for military, telecommunications,medical, environment monitoring industry,material is widely ranged from optical glass to IR and UV glass.
As a Fast-growing supplier in Optics, Yutai Optics offers excellent service and good quality items,our products have been appreciated by many European and American customers,of course we build a long-term cooperation.YuTai Optics has quickly established itself as a leader in optical components from its advanced technology and quality control.
Our Advantage
Sells Team
Yutai Optics has a professinal sells team with excellent service, we tracking from inquiry to delivery of items.We try our best to meet each customers'request.
Produciton Team
Yutai Optics has many experienced engineers and advanced machines, they are the important guarantee for the higher quality products.Our advanced production machines list:
Ring polishing machine, Single axis machine, Two axis machine, Four axis machine,Centering edging machine,Mechanical milling machine,Spectrograph, Grinding machine,nanotech.250upl,talysurfi120.
Inspection Team
Advanced testing equipment and methods are important guarantee for the production of high-precision products.Our testing machine is ZYGO, Stereo interferometer,Horizontal interferometer.We provide testing report for each batch for your items.
Process for most optics
Material-cutting-rounding-milling-grinding-polishing-edging-cleaning-coating-gluing-edging-blacking-accembly-packing-shipping
Packaging & Shipping
1 Package Detail: A. Standard carbon and envelop with plastic foam.
B. Safety green carton.
C. Customized.
2 Delivery Detail: Within 30 days.(Also depand on the quantity)
Payment: