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Plano-concave spherical lenses

Plano-Concave Lenses are the best choice where object and image are at absolute conjugate ratios greater than 5:1 and less than 1:5 to reduce spherical.Plano-Concave lenses bend parallel input rays so they diverge from one another on the output side of the lens and hence have a negative focal length.The spherical aberration of the Plano-Concave lenses is negative and can be used to balance aberrations created by other lenses. Similar to the Plano-Convex lenses,the curvature surface should face the largest object distance or the infinite conjugate (except when used with high-energy lasers where this should be reversed to eliminate the possibility of a virtual focus) to minimize spherical aberration.

Atoptical provides these lenses with the material of BK7, fused silica ,Si,Ge,CaF2,or other optical glass and crystal ect..

 


  Specifications

Normal

High Precision

Mfg.Limit

  Material :

N-BK7

N-BK7

N-BK7

  Design Index: 

1.5168

1.5168

1.5168

  Diameter Tolerance :

+0/-0.1mm

+0/-0.05mm

+0/-0.02mm

  Thickness Tolerance :

+/-0.1mm

+/-0.05mm

+/-0.01mm

  Focal Length Tolerance: 

+/-2%

+/-1%

+/-0.5%

  Centeration :

3 arc min

1 arc min

30 arc sec

  Surface Quality :

60-40

40-20

10-5

  Surface Figure :

3 lambda

2 lambda

1 lambda

  Surface Irregularity :

1 lambda

1/5 lambda

1/10 lambda

  Clear Aperture :

>80%

>90%

100%

  Bevel :

+/-0.2mm*45 deg

+/-0.1mm*45 deg

+/-0.05mm*45 deg


Other materials are also available. 

AR coating is available apon request.