The double concave lenses with the negative focal length, these lenses are used in Beam Expanders, optics image, laser system and so on.
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Parameter
| Structure | Bi Concave Lens |
| Material | Optical glass, UVFS, Germanium, Silicon, CaF2, MgF2, ZnSe ZnS, Sapphire |
| Diameters Available | 0.5mm to 600mm |
| Diameter Tolerance | +0.00/-0.01mm or customer design |
| Surface Quality | 10-5 |
| Surface Irregularity | λ/10 PV @632.8nm or customer design |
| Thickness tolerance | +0/-0.01mm |
| Clear Aperture | >90% of Diameter |
| Chamfer | 0.05-0.5mmx45degree |
| Centeration | <10 arcsec |
| Coating | Single Mag2, Multiple Layers AR Coating A:350-650nm B:650-1050nm C:1050-1585nm D: Customer Design |
Bk7 Standard Double Concave 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 |
The optical path diagram of the imaging law of concave lenses
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