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Location: Main > Optical Lenses > Spherical Bi Concave Lenses > POL-UVFS-BCV-AR1060-0200-48.5
Name: DIA20.0mm UVFS Bi-Concave Lens(1060-1070nm)
P/N: POL-UVFS-BCV-AR1060-0200-48.5
Keywords:Dia20.0mm,UVFS,EFL-48.5mm,Bi-Concave,AR1060-1070nm
Unit Price: S$340.00/pc
Available: In stock
Request: Add to Request List
Introduction:
Bi-Concave lenses have a negative focal length and are best used to diverge a converging beam. Similar to a Plano-Concave lens, a Bi-Concave lens can diverge a collimated beam to a virtual focus as used in a Galilean type beam expander.
But 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.
Substrate Material:  UVFS Corning 7980
 Wavelength Range:  200-2000nm
 Design Wavelength:  1064nm (n=1.458464),bi-concave
 Outer Diameter:  20.0mm (-0.15/-0.05mm)
 Center Thickness(Tc):  Tc = 3.0 +/-0.1mm
 Edge Thickness(Te):  Te = 5.4 +/-0.1mm 
 Radius of Converture-Left(R1):  R1= - 3085mm
 Radius of Converture-Right(R2):  R2= - 21.98mm 
 Effective Focal Length(EFL):  - 48.5mm
 Surface Quality:  40/20 scratch and dig
 Clear Aperture: >90% over surfaces 
 Surface Figure: <lambda/4 @ 633nm inspected over clear aperture 
 Centration:  <3 arc minutes
 Coating:  AR/AR coated @ 1050-1080nm, R<0.25%,0-deg design