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Bi Concave Lens
Bi Concave Lens
Bi Concave Lens
The double concave lenses with the negative focal length, these lenses are used in Beam Expanders, optics image, laser system and so on. 
 
     Specifications 
 Dia.  N-BK7  
 Diameter Tol.  +0.00/-0.1mm
 Desigh Wavelength  546.10nm
 Design Index  1.5183
 Centration  <3arcmin
 Clear Aperture  >90%
 S/D  40-20 Scratch and dig
 Flatness  1/4lambda at 632.80nm
 Chamfer  0.25mmx45°
 Focal Length Tol.  +/-1%

     Bk7 Standard Double Convex Lens
 No.  EFL(mm)   Dia.(mm) R1=R2(mm)  Material   Tc(mm)  Te(mm)
 SD4A12   -20  12.70  21.08  BK7  2.00  3.96
 SD4A13   -30  12.70  31.48  BK7  2.00  3.29
 SD4A14  -40

 12.70

 41.48  BK7  2.00  2.97
 SD4A15  -50  12.70  52.24  BK7  2.00  2.78
 SD4A25  -50  25.40  52.17  BK7  2.00  5.10
 SD4A27  -75  25.40  78.09  BK7  2.00  4.10
 SD4A210  -100  25.40  104.00  BK7  2.00  3.60
 SD4A215  -150  25.40  156.00  BK7  2.00  3.00
 SD4A220  -200  25.40  207.66  BK7  2.00  2.80
 SD4A225   -250  25.40  259.49  BK7  2.00  2.60
  
     Manufacture Specifications

 Diameter

 0.5mm to 600mm

 Diameter Tolerance

 +0.00/-0.1 or customer size

 Material

 N-BK7,H-K9L,Sapphire,Fused Silica(JGS1),Caf2,ZnSe,Si,Ge,etc.

 Surface Quality

 80-50 to 10/5

 Flatness

 1 lambda to 1/10 lambda

 Thickness Tolerance

 +0.00/-0.05mm

 Focal Length Tolerance

 +/-1%

 Clear Aperture

 >90% of diameter

 Centration

 <3arcmin

 Coating

  Single Mag2,  Multiple Layers AR Coating
       A:350-650nm
       B:650-1050nm
       C:1050-1585nm
       D: Customer Design

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