Plano-Concave Lenses
- Shape: Plano-Concave
- Diameter Tolerance: ± 0.05mm
- Thickness Tolerance: ± 0.05mm
- Radius：± 0.3%
- Focal Length Tolerance: ± 1%
- Surface Quality: 40-20 Scratch-Dig（After Coating）
- Surface Flatness: λ/4 @633 nm
- Centration: < 3 arc minutes
- Clear Aperture: > 95% of central dimension
Plano-Concave Lenses are optical lenses with one flat surface (plano) and one inwardly curved surface (concave). These lenses are commonly used to diverge light beams, spread light, or increase focal lengths. They are often found in laser systems, imaging applications, and optical instruments. The concave shape helps control light dispersion and is essential for applications requiring beam expansion or light spreading. These lenses are available in various materials such as glass, quartz, and optical plastics, tailored to meet specific application needs.
General Specification
| Parameter | Value |
| Default unit | mm |
| Material | BK7 |
| Diameter tolerance | +0,-0.1mm (+0, -0.15mm for diameter>75mm) |
| Focal length tolerance | +/-2% |
| Center thickness tolerance | +/-0.2mm |
| Centration | 3 arc min |
| Surface quality | 60-40 |
| Flange width | 0.2-0.4mm |
