Bi-concave lenses have negative focal lengths, making them useful for a wide range of applications.They are often used to increase the divergance of a converging beam. In optical systems, it is common for researchers to choose their optics carefully so that the aberrations introduced by the positive- and negative-focal-length lenses approximately cancel. Others use these lenses in pairs to increase the effective focal length of a converging lens.
When deciding between a plano-concave lens and a bi-concave lens, both of which cause the incident light to diverge, it is usually preferrable to choose a bi-concave lens if the absolute conjugate ratio (object distance divided by image distance) is close to 1. When the desired absolute magnification is either less than 0.2 or greater than 5, the tendency is to choose a plano-concave lens instead.
Specifications
Materials:BK7, Fused Silica,Ge,Si, CaF2...
Diameter:1.5-300mm
Diameter Tolerance:+/-0.02 mm
Thickness Tolerance:0+/-0.02mm
Centring Error<3 Arc minute
Surface Quality:20-10
Surface Figure:λ/10@633nm
Clear Aperture:90%
Coating: Specified by customers
Other Items
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 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
Sales Team
Yutai Optics has a professinal sales team with excellent service, we tracking from inquiry to delivery of items.We try our best to meet each customers'request.
Production 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:
){kind=link}
){kind=link}