The focal length of Double-Concave Lens is negative, and parallel incident light rays diverge outward,
The two sides of Double-Concave Lens have equal curvature radii and are generally used for beam expansion and projection.
Double-Concave Lenses with negative focal length are commonly used in imaging or beam collimation applications, and coated lenses are also widely used in visible and near-infrared applications.
Common Specifications
| Material | Crown, Flint, UVFS | Focal Length Tolerance | ± 0.5% | ||||||||
| Diameter Tolerance | +0/-0.02mm | Thickness Tolerance | ±0.01mm | ||||||||
| Surface Flatness | λ/10 | Centration Error | <1 arcmin | ||||||||
| Surface Quality | 20/10 | Clear Aperture | >90% of central diameter | ||||||||
| Coating | MgF2 AR,BBAR or optional | Bevel | Protective bevel as needed | ||||||||
Products specifications in stock
| No. | Stock number | Diameter | EFL | Center thickness | Coating Specification |
| 1 | 1261024 | 4.50 | 159.74 | 2.00 | Ravg<2%@658-780nm |
| 2 | 1261004 | 5.00 | 31.07 | 2.00 | MgF2 840nm |
| 3 | 1261007 | 5.00 | 30.13 | 1.30 | MgF2-655nm |
| 4 | 1261006 | 5.50 | 15.07 | 1.60 | MgF2-655 |
| 5 | 1220020 | 6.00 | 15.46 | 1.50 | MgF2-550nm |
| 6 | 1282003 | 6.00 | 24.00 | 1.50 | 425-675nm,Ravg≤0.4% |
| 7 | 1004063 | 6.00 | 34.45 | 2.00 | 525±30nm ≤1.5% |
| 8 | 1261008 | 6.00 | 72.93 | 3.00 | MgF2 840nm |
| 9 | 1161011 | 6.33 | 30.00 | 1.83 | Ravg<0.3%@532±5nm |
| 10 | 1004008 | 6.40 | 41.78 | 1.50 | Uncoated |
| 11 | 1280020 | 6.50 | 34.94 | 1.70 | R<0.5%@450-580nm,R<1%@640nm, Rabs<0.5%@430-640nm, |
| 12 | 1280021 | 6.50 | 17.50 | 2.00 | R<0.5%@450-580nm,R<1%@640nm, Rabs<0.5%@430-640nm, |
| 13 | 1007121 | 6.60 | 13.49 | 2.30 | MgF2-550nm |
| 14 | 1261015 | 7.00 | 48.00 | 2.25 | R<3%@350-850nm,R<1.5%@500-550nm |
| 15 | 1215001 | 7.50 | 44.93 | 2.50 | MgF2-550nm |
| 16 | 1285017 | 8.00 | 17.50 | 1.80 | MgF2-550nm |
| 17 | 1215002 | 8.00 | 29.05 | 2.50 | Uncoated |
| 18 | 1001093 | 8.00 | 30.70 | 1.60 | Uncoated |
| 19 | 1001058 | 8.00 | 45.09 | 2.00 | Uncoated |
| 20 | 1007035 | 8.00 | 84.70 | 1.80 | MgF2-550nm |
| 21 | 1215006 | 8.00 | 19.95 | 2.30 | MgF2-550nm |
| 22 | 1001114 | 9.00 | 25.47 | 2.00 | MgF2-550nm |
| 23 | 1007003 | 13.00 | 23.85 | 2.80 | MgF2-550nm |
| 24 | 1051003 | 14.00 | 69.33 | 2.20 | Uncoated |
| 25 | 1007102 | 14.80 | 23.22 | 5.00 | Uncoated |
| 26 | 1261026 | 15.00 | 83.41 | 3.50 | R<2%@780nm |
| 27 | 1021001 | 15.80 | 32.00 | 3.00 | MgF2-550nm |
| 28 | 1269003 | 16.00 | 19.30 | 5.00 | MgF2-550nm |
| 29 | 1205007 | 16.00 | 40.00 | 2.30 | Ravg≤0.5%@420-680 |
| 30 | 1274016 | 19.00 | 87.39 | 3.00 | MgF2-550nm |
| 31 | 1007044 | 20.00 | 25.01 | 8.00 | Uncoated |
| 32 | 1007085 | 20.00 | 25.01 | 8.00 | Uncoated |
| 33 | 1009001 | 20.00 | 30.78 | 3.60 | T>99.5%@905±30nm, |
| 34 | 1007095 | 20.00 | 48.19 | 5.30 | Uncoated |
| 35 | 1305007 | 20.00 | 852.34 | 2.00 | R<1%@350-850nm |
| 36 | 1305009 | 20.00 | 1411.70 | 2.00 | R<1%@350-850nm |
| 37 | 1305001 | 20.00 | 2000.00 | 2.10 | R<0.5%@350-700nm |
| 38 | 1007096 | 20.00 | 24.99 | 8.00 | Uncoated |
| 39 | 1007132 | 21.00 | 77.24 | 3.20 | MgF2-550nm |
| 40 | 1051001 | 21.30 | 318.57 | 2.30 | Uncoated |
| 41 | 1252016 | 22.00 | 30.55 | 6.00 | MgF2-550nm |
| 42 | 1007094 | 22.00 | 52.60 | 3.80 | Uncoated |
| 43 | 1007086 | 22.00 | 57.53 | 3.50 | Uncoated |
| 44 | 1007059 | 23.00 | 63.32 | 3.80 | Uncoated |
| 45 | 1273009 | 23.00 | 59.59 | 4.00 | R<0.5%@450-650nm |
| 46 | 1273009-2 | 23.00 | 60.85 | 4.00 | R<0.5%@450-650nm |
| 47 | 1007119 | 24.00 | 125.10 | 3.00 | MgF2-550nm |
| 48 | 1001035 | 24.00 | 190.00 | 3.50 | MgF2-550nm |
| 49 | 1007090 | 24.00 | 31.90 | 6.70 | Uncoated |
| 50 | 1007135 | 24.50 | 41.80 | 5.60 | Uncoated |
| 51 | 1007087 | 25.00 | 50.00 | 5.00 | Uncoated |
| 52 | 1252067 | 25.00 | 56.90 | 4.00 | Uncoated |
| 53 | 1007130 | 26.00 | 181.07 | 3.00 | MgF2-550nm |
| 54 | 1252089 | 28.00 | 60.84 | 5.00 | Ravg ≤0.5% @ 425 - 675nm |
| 55 | 1007103 | 28.40 | 42.38 | 8.00 | Uncoated |
| 56 | 1007084 | 28.40 | 44.56 | 6.00 | Uncoated |
| 57 | 1005017 | 28.90 | 45.43 | 6.80 | MgF2-550nm |
| 58 | 1005016 | 28.90 | 75.52 | 4.66 | Uncoated |
| 59 | 1007088 | 29.50 | 42.38 | 8.00 | Uncoated |
| 60 | 1007092 | 30.00 | 58.10 | 5.60 | Uncoated |
| 61 | 1290005 | 30.00 | 100.00 | 4.20 | T>97.5%@1064nm |
| 62 | 1290006 | 30.00 | 100.00 | 4.20 | T>97.5%@1064nm |
| 63 | 1290007 | 30.00 | 100.00 | 4.20 | T>97.5%@1064nm |
| 64 | 1290003 | 30.00 | 120.00 | 3.80 | T>97.5%@1064nm |
| 65 | 1290004 | 30.00 | 150.00 | 3.50 | T>97.5%@1064nm |
| 66 | 1001088 | 32.00 | 133.99 | 4.30 | MgF2-550nm |
| 67 | 1007099 | 35.00 | 65.02 | 6.70 | Uncoated |
| 68 | 1007101 | 38.00 | 51.85 | 9.00 | Uncoated |
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