Bi-concave lenses

1.Materials:Optical plastic glass,K9,JGS1,JGS3,MgF2,BaF2,Ge,Si,N-BK7,UV-Grade Fused Silica,CaF2,ZnSe etc..
2.EFL:±1%
3.Diameter Tolerance:+0/-0.05mm(precision),+0/-0.1mm(Standard)
4.Center Thickness Tolerance: +/-0.05mm(precision),+/-0.1mm(Standard)
5.Surface Quality: 40/20 20/10
6.Centration: ±1 arc minutes
7.Surface Figure:λ/8(precision),λ/4(Standard) at 632.8nm
8.Clear Aperture: >90% of diameter
9.Coating: Customized
10.Applications:Nd:YAG lasers,High-power laser applications,Camera,laser beam expanders,viewers,projection systems,etc..

Bi-concave lens has two concave surfaces.Compared with Plano-concave,It produces better effect in diverging light beam passing through the lens.Also called negative lens or diverging lens,which are widely applied for laser beam expanders,projectors.