Unmounted, N-BK7 Symmetric-Concave Lenses, Uncoated
Excelitas offers LINOS® Symmetric-Concave Lenses made from uncoated N-BK7 glass, available in various focal lengths and diameters to suit your application. These lenses are produced with premium materials and the most stringent tolerances to guarantee exceptional quality. In addition to these unmounted versions, every lens type is also offered with a high-quality, black-anodized, engraved aluminum mount.
Made from high-quality N-BK7 glass, our unmounted symmetric-concave lenses offer flexibility for custom integration into optical systems. Their narrow focal-length tolerances ensure consistent system integration and reliable optical performance. Featuring two equal radii of curvature, these lenses deliver precise optical performance for applications that require controlled beam divergence. The uncoated N-BK7 singlets are suitable for a broad wavelength range.
ZEMAX files are provided to streamline optical design and simulation. For customized specifications or higher-volume production, contact us to provide a quotation tailored to your technical requirements.
Note: f = focal length (object side), f' = focal length (image side) , s = object distance, s' = back focal length, Ø = lens diameter, dm = center thickness, dr = edge thickness, h = primary vertex, h' = sagittal height secondary vertex, F, F' = focal points, H, H' = principal points; Tolerances: focal length f: ±2% image distance s': ±2%
| Product | Biconcave lens; N-BK 7; D=22.4; F=-20 | Biconcave lens; N-BK 7; D=22.4; F=-100 | Biconcave lens; N-BK 7; D=22.4; F=-50 | Biconcave lens; N-BK 7; D=12.7; F=-20 | Biconcave lens; N-BK 7; D=10; F=-10 | Biconcave lens; N-BK 7; D=12.7; F=-100 | Biconcave lens; N-BK 7; D=12.7; F=-50 | Biconcave lens; N-BK 7; D=22.4; F=-40 | Biconcave lens; N-BK 7; D=22.4; F=-30 | Biconcave lens; N-BK 7; D=22.4; F=-150 |
| Optic Size | Ø 22.4 mm | Ø 22.4 mm | Ø 22.4 mm | Ø 12.7 mm | Ø 10.0 mm | Ø 12.7 mm | Ø 12.7 mm | Ø 22.4 mm | Ø 22.4 mm | Ø 22.4 mm |
| Focal Length (+/-) | -20.0 mm | -100.0 mm | -50.0 mm | -20.0 mm | -10.0 mm | -100.0 mm | -50.0 mm | -40.0 mm | -30.0 mm | -150.0 mm |
| Optic Substrate | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 |
| Optic Center Thickness | 1.5 mm | 1.5 mm | 1.5 mm | 1.5 mm | 1.0 mm | 1.5 mm | 1.5 mm | 1.5 mm | 1.5 mm | 1.5 mm |
| Radius of Curvature 1 | -20.833 mm | -104.41 mm | -52.33 mm | -20.983 mm | -10.669 mm | -104.41 mm | -52.33 mm | -41.867 mm | -31.396 mm | -156.22 mm |
| Radius of Curvature 2 | 20.833 mm | 104.41 mm | 52.33 mm | 20.983 mm | 10.669 mm | 104.41 mm | 52.33 mm | 41.867 mm | 31.396 mm | 156.22 mm |
| Tolerance thickness | ± 0.2 mm | ± 0.2 mm | ± 0.2 mm | ± 0.1 mm | ± 0.15 mm | ± 0.1 mm | ± 0.1 mm | ± 0.2 mm | ± 0.2 mm | ± 0.2 mm |
| Optic Edge Thickness | 7.2 mm | 2.7 mm | 3.9 mm | 3.5 mm | 3.5 mm | 1.9 mm | 2.3 mm | 4.5 mm | 5.6 mm | 2.3 mm |
| Optic Centering Accuracy (min,sec) | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' |
| Tolerance of optic size | - 0.13 mm | - 0.13 mm | - 0.13 mm | - 0.12 mm | - 0.09 mm | - 0.12 mm | - 0.12 mm | - 0.13 mm | - 0.13 mm | - 0.13 mm |
| Height | 3.27 mm | 0.6 mm | 1.21 mm | 0.98 mm | 1.24 mm | 0.19 mm | 0.39 mm | 1.53 mm | 2.07 mm | 0.4 mm |
| f' at X nm |
-19.84 mm -19.98 mm -20.31 mm |
-100.4 mm -101.1 mm -102.78 mm |
-50.2 mm -50.55 mm -51.39 mm |
-19.98 mm -20.12 mm -20.46 mm |
-10.12 mm -10.19 mm -10.36 mm |
-100.4 mm -101.1 mm -102.8 mm |
-50.2 mm -50.55 mm -51.4 mm |
-40.11 mm -40.39 mm -41.07 mm |
-30.02 mm -30.23 mm -30.73 mm |
-150.34 mm -151.4 mm -153.91 mm |
| Coating Specification | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable |
| Part Number | G313205000 | G313216000 | G313215000 | G313373000 | G313210000 | G313375000 | G313374000 | G313214000 | G313206000 | G313217000 |
Tight manufacturing tolerances for excellent performance and precision mounting
Uncoated, suitable for broad wavelength range; for details, refer to the typical transmission curve of N-BK7
Unmounted lenses allow for flexible, custom integration into your optical system
ZEMAX files available, enabling easy system design and simulation
| Product | Biconcave lens; N-BK 7; D=22.4; F=-20 | Biconcave lens; N-BK 7; D=22.4; F=-100 | Biconcave lens; N-BK 7; D=22.4; F=-50 | Biconcave lens; N-BK 7; D=12.7; F=-20 | Biconcave lens; N-BK 7; D=10; F=-10 | Biconcave lens; N-BK 7; D=12.7; F=-100 | Biconcave lens; N-BK 7; D=12.7; F=-50 | Biconcave lens; N-BK 7; D=22.4; F=-40 | Biconcave lens; N-BK 7; D=22.4; F=-30 | Biconcave lens; N-BK 7; D=22.4; F=-150 |
| Optic Size | Ø 22.4 mm | Ø 22.4 mm | Ø 22.4 mm | Ø 12.7 mm | Ø 10.0 mm | Ø 12.7 mm | Ø 12.7 mm | Ø 22.4 mm | Ø 22.4 mm | Ø 22.4 mm |
| Focal Length (+/-) | -20.0 mm | -100.0 mm | -50.0 mm | -20.0 mm | -10.0 mm | -100.0 mm | -50.0 mm | -40.0 mm | -30.0 mm | -150.0 mm |
| Optic Substrate | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 | N-BK7 |
| Optic Center Thickness | 1.5 mm | 1.5 mm | 1.5 mm | 1.5 mm | 1.0 mm | 1.5 mm | 1.5 mm | 1.5 mm | 1.5 mm | 1.5 mm |
| Radius of Curvature 1 | -20.833 mm | -104.41 mm | -52.33 mm | -20.983 mm | -10.669 mm | -104.41 mm | -52.33 mm | -41.867 mm | -31.396 mm | -156.22 mm |
| Radius of Curvature 2 | 20.833 mm | 104.41 mm | 52.33 mm | 20.983 mm | 10.669 mm | 104.41 mm | 52.33 mm | 41.867 mm | 31.396 mm | 156.22 mm |
| Tolerance thickness | ± 0.2 mm | ± 0.2 mm | ± 0.2 mm | ± 0.1 mm | ± 0.15 mm | ± 0.1 mm | ± 0.1 mm | ± 0.2 mm | ± 0.2 mm | ± 0.2 mm |
| Optic Edge Thickness | 7.2 mm | 2.7 mm | 3.9 mm | 3.5 mm | 3.5 mm | 1.9 mm | 2.3 mm | 4.5 mm | 5.6 mm | 2.3 mm |
| Optic Centering Accuracy (min,sec) | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' | 10.0 ' |
| Tolerance of optic size | - 0.13 mm | - 0.13 mm | - 0.13 mm | - 0.12 mm | - 0.09 mm | - 0.12 mm | - 0.12 mm | - 0.13 mm | - 0.13 mm | - 0.13 mm |
| Height | 3.27 mm | 0.6 mm | 1.21 mm | 0.98 mm | 1.24 mm | 0.19 mm | 0.39 mm | 1.53 mm | 2.07 mm | 0.4 mm |
| f' at X nm |
-19.84 mm -19.98 mm -20.31 mm |
-100.4 mm -101.1 mm -102.78 mm |
-50.2 mm -50.55 mm -51.39 mm |
-19.98 mm -20.12 mm -20.46 mm |
-10.12 mm -10.19 mm -10.36 mm |
-100.4 mm -101.1 mm -102.8 mm |
-50.2 mm -50.55 mm -51.4 mm |
-40.11 mm -40.39 mm -41.07 mm |
-30.02 mm -30.23 mm -30.73 mm |
-150.34 mm -151.4 mm -153.91 mm |
| Coating Specification | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable | Selectable |
| Part Number | G313205000 | G313216000 | G313215000 | G313373000 | G313210000 | G313375000 | G313374000 | G313214000 | G313206000 | G313217000 |
Tight manufacturing tolerances for excellent performance and precision mounting
Uncoated, suitable for broad wavelength range; for details, refer to the typical transmission curve of N-BK7
Unmounted lenses allow for flexible, custom integration into your optical system
ZEMAX files available, enabling easy system design and simulation