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Lenses for defocussing or beam expanding in applications with roughly symmetric object/image distances. Download complete lens catalogue (2MB) Fused Silica Double-Concave Lenses back to overview | Material: | UV Grade Fused Silica |  | | Design Wavelength: | 587.6nm; n=1.45848 | | Diameter Tolerance: | +0.0 /-0.1mm | Center Thickness Tolerance: | ±0.2mm | | Focal Length Tolerance: | ±2% | | Centering Tolerance: | 3 arc minutes | | Surface Quality: | 40/20 scratch-dig | | Clear Aperture: | >90% | | Surface Figure: | λ/4 @ 632.8nm | | Bevel : | 0.2mmx450 | | Coatings: | without coating | (if you require an AR coating, please specify with your order) |
| OrderNo. | Dia.(mm) | EFL(mm) | BFL(mm) | R1=R2(mm) | Tc(mm) | Te(mm) | DCV-FS-006-006 | 6.3 | -6.3 | -6.956 | -6.08 | 2.0 | 3.76 | DCV-FS-010-010 | 10.0 | -10.0 | -10.67 | -9.48 | 2.0 | 4.85 | DCV-FS-012-012 | 12.7 | -12.7 | -13.366 | -11.95 | 2.0 | 5.65 | DCV-FS-012-015 | 12.7 | -15.0 | -15.805 | -14.125 | 2.4 | 5.42 | DCV-FS-025-025 | 25.4 | -15.0 | -26.076 | -14.125 | 2.0 | 9.42 | DCV-FS-025-030 | 25.4 | -30.0 | -30.678 | -27.82 | 2.0 | 8.14 |
BK7 Double-Concave Lenses back to overview | Material: | BK7 grade A optical glass | | | Design Wavelength: | 587.6nm | | Diameter Tolerance: | +0.0 /-0.1mm | Center Thickness Tolerance: | ±0.2mm | | Focal Length Tolerance: | ±2% | | Centering Tolerance: | 3 arc minutes | | Surface Quality: | 60/40 scratch-dig | | Clear Aperture: | >90% | | Surface Figure: | λ/4 @ 632.8nm | | Bevel : | 0.2mmx450 | | Coatings: | without coating | (if you require an AR coating, please specify with your order) |
| OrderNo. | Dia.(mm) | EFL(mm) | BFL(mm) | R1=-R2(mm) | Tc(mm) | Te(mm) | DCV-BK7-002-002 | 2.0 | -2.0 | -2.307 | -2.224 | 1.0 | 1.48 | DCV-BK7-002-003 | 2.0 | -2.5 | -2.810 | -2.742 | 1.0 | 1.38 | DCV-BK7-003-003 | 3.0 | -3.0 | -3.313 | -3.26 | 1.0 | 1.73 | DCV-BK7-003-006 | 3.0 | -6.3 | -6.621 | -6.672 | 1.0 | 1.34 | DCV-BK7-003-009 | 3.0 | -10.0 | -10.32 | -10.495 | 1.0 | 1.22 | DCV-BK7-004-004 | 4.0 | -4.0 | -4.317 | -4.295 | 1.0 | 1.99 | DCV-BK7-006-006 | 6.3 | -6.3 | -6.776 | -6.752 | 1.5 | 3.06 | DCV-BK7-010-010 | 10.0 | -10.0 | -10.480 | -10.577 | 1.5 | 4.01 | DCV-BK7-012-012 | 12.5 | -12.5 | -12.480 | -12.643 | 1.5 | 4.81 | DCV-BK7-016-016 | 16.0 | -16.0 | -16.49 | -16.775 | 1.5 | 5.56 | DCV-BK7-025-025 | 25.0 | -25.0 | -25.66 | -26.16 | 2.0 | 8.36 | DCV-BK7-040-040 | 40.0 | -40.0 | -40.82 | -41.74 | 2.5 | 12.71 | DCV-BK7-050-050 | 50.0 | -50.0 | -50.99 | -52.15 | 3.0 | 15.77 |
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