N-BK7 Plano-Concave Round Cylindrical Lenses, Uncoated/AR350-1700nm
Tuniu Plano-Concave Round Cylindrical Lenses are precision one-dimensional beam-shaping optical elements used to adjust beam spot size. Featuring a plano-concave cylindrical structure with negative focal length, these lenses effectively suppress spherical and chromatic aberrations when the concave surface faces the incoming diverging beam.
Crafted from premium N-BK7 optical glass with excellent stability and superior homogeneity, the material is widely applied in visible and near-infrared spectral ranges. Our N-BK7 plano-concave round cylindrical lenses support high-power laser operation, and are ideal for satellite optics and astronomical optical systems.
Tuniu provides cylindrical lenses in multiple material options including N-BK7 and UV fused silica. All models are available in uncoated and anti-reflection (AR) coated versions. Uncoated lenses feature a wide spectral range and high laser damage threshold. Three standard AR coating bands are offered for N-BK7 lenses: 350–700 nm, 650–1050 nm and 1050–1700 nm. Custom specifications in dimensions, focal lengths, materials and coatings can be tailored to specific application demands. Please consult our technical support team for customized requirements.
Parameters
| Optical materials | N-BK7 | Size | Ø25.4 mm |
| Clear aperture | > Ø21.0 mm | Refractive index | 1.52 |
| Abbe | Vd=64.17 | Design wavelength | 587.6 nm |
| Diameter tolerance | + 0.0/ -0.1 mm | Thickness tolerance | ± 0.1 mm |
| Focal length tolerance | ± 1% | Eccentricity | ≤ 3 arcmin |
| Face PV value | λ | Number of spherical aperture | 3 |
| Flatness (@633 nm) | λ/2 | Surface smoothness (scratches/pitting) | 40/20(Uncoated), 60/40 |
| Operating band | 350-2000 nm(Uncoated), AR350–700 nm/650–1050 nm/1050–1700 nm | ||
| Anti-reflective coating | Ravg < 0.5%@350-700 nm/350–700 nm/650–1050 nm/1050–1700 nm | ||
Model
N-BK7 Plano-Concave Round Cylindrical Lenses, Uncoated/AR350–700 nm/650–1050 nm/1050–1700 nm, Mounted in 25.4 mm-OD Retaining Ring
| Size, mm | Focal Length, mm |
| 25.4 | -50.0/-75.0/-100.0/-125.0/-200.0/-400.0/-1000.0 |